CN110644698A - Precast concrete beam type stair - Google Patents
Precast concrete beam type stair Download PDFInfo
- Publication number
- CN110644698A CN110644698A CN201910871033.6A CN201910871033A CN110644698A CN 110644698 A CN110644698 A CN 110644698A CN 201910871033 A CN201910871033 A CN 201910871033A CN 110644698 A CN110644698 A CN 110644698A
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- stair
- section inclined
- beam type
- precast concrete
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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
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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
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
- E04F11/02—Stairways; Layouts thereof
- E04F11/104—Treads
- E04F11/116—Treads of stone, concrete or like material or with an upper layer of stone or stone like material, e.g. ceramics, concrete; of glass or with an upper layer of glass
Abstract
The invention provides a precast concrete beam type stair which comprises a precast beam type stair body, a first supporting beam type stair body node, a second supporting beam type stair body node and a third supporting beam type stair body node; and the folded plate type step supports on the prefabricated beam type stair body are supported on the ladder section inclined beams, and cantilever ends are formed on two sides of the ladder section inclined beams. The folded plate type steps of the concrete beam type stair are supported on the first stair section inclined beam and the second stair section inclined beam, overhanging ends are formed at two ends of the folded steps, the thickness of a surface layer can be reduced, the prefabricated concrete beam type stair is lighter, the safety and convenience of conveying and hoisting are improved, high-performance concrete is adopted for prefabrication, the stair section inclined beams are combined to be in a wide-upper-narrow-lower-narrow form, the stress of the stair section inclined beams is better on the whole, the form removal is easier, and the beam type stair has higher mechanical property and stronger waterproofness, wear resistance and corrosion resistance comprehensively.
Description
Technical Field
The invention relates to the field of buildings, in particular to a precast concrete beam type stair.
Background
The stairway is used as a component for vertical traffic between floors in a building, and plays an important role in personnel movement and disaster escape, so that the structural quality of the stairway is continuously enhanced. The reinforced concrete stair has two construction methods of integral cast-in-place and prefabricated assembly. The existing method is generally used for integral cast-in-place, and the construction quality of the stair often has a plurality of problems in the long-term integral cast-in-place construction process. Such as: 1) if the wood mold is adopted, the stepping height, the stepping width and the stepping width are different due to the fact that the wood mold is controlled by the experience of workers; 2) because the stair steps are complex, the vibration is difficult on site, and the situations of hollowing, missing edges and corner falling or concrete honeycombs are easy to occur; 3) no matter a wood mold or an aluminum mold is adopted, the structure is complicated, workers need to assemble and disassemble each layer once, and the workload of the workers is greatly increased; 4) due to the relatively low efficiency, the costs are increased locally in the staircase area. For the stairs with more problems in cast-in-place, the prefabricated member has the inherent advantage of standardization of the prefabricated members in view of easy unification of floors, tread width and tread height, and is suitable for popularization. Compared with the traditional integral cast-in-place stair, the prefabricated concrete stair is integrally prefabricated in a component factory and is hoisted in place after being transported to a construction site, so that the prefabricated concrete stair has the advantages of reusable moulds, high component forming quality, low construction cost, simplicity and convenience in site construction and the like, and meets the national requirements on green, environmental protection and sustainable development. But because the design requirement, need adopt the scissors ladder among the high-rise building, the board-like scissors ladder of floor height reaches about 5 tons about 3 meters normal, even adopt ordinary beam type stair also to reach 3 tons more, if need adopt prefabricated stair, corresponding tower crane needs to be upgraded, and then greatly increased cost leads to the popularization stagnation of prefabricated stair, and when board-like scissors ladder was used for the building of division and floor height great, its self weight was great moreover, leads to stair hoist and mount, transportation and installation difficulty.
For example, the patent with the chinese patent number CN201510024455.1 discloses a stair, which comprises a first stair section and a first connecting beam, wherein the body of the first connecting beam is fixedly connected with the first stair section, the first end of the first connecting beam is fixedly connected with a floor slab/ground, and the second end of the first connecting beam is fixedly connected with a connecting platform/floor slab; the first end of the first stair section is fixedly connected with the floor slab/ground, and the second end of the first stair section is fixedly connected with the connecting platform/floor slab.
Also, for example, US09542965 discloses a standard guard, which is mainly: a partitioned barrier extension access a port of and a stabilized in indexing manager from a side site and a spaced address as to a limit direct level up or down states or states. The invention mainly arranges the barriers on the ladder sections, and the ladder sections are not optimally designed.
Further, as disclosed in application No. CN201410854561.8, a staircase comprises a steel beam, a suspension device and a step part; wherein the steel beam is suspended by the suspension device; the step part comprises a step plate connecting piece and a step plate; the step plate connecting piece fixes the step plate on the steel beam; the stair tread comprises toughened glass layers and a film layer clamped between the toughened glass layers, the stair tread is convenient and quick to install indoors, and the toughened glass layers are adopted as the stair tread, but the stair tread is small in applicable span and cannot meet the installation requirement of high-performance stairs.
In summary, there is a need in the art to develop a stair, which can meet the requirements of light dead weight, large applicable span, high performance, convenient installation and short construction period.
In the concrete beam type stair field, a plurality of practical problems to be treated in practical application still have unrefined solutions.
Disclosure of Invention
The invention provides a precast concrete beam type stair aiming at the defects of the prior art.
In order to overcome the defects in the prior art, the specific technical scheme of the invention is as follows:
a precast concrete beam type stair comprises a beam type stair body, a first supporting beam type stair body node, a second supporting beam type stair body node and a third supporting beam type stair body node;
the beam type stair body comprises a stair section inclined beam and a folding plate type step, the stair section inclined beam comprises a first stair section inclined beam and a second stair section inclined beam, the folding plate type step is supported on the first stair section inclined beam and the second stair section inclined beam, and cantilever ends are formed on one sides of the first stair section inclined beam and one side of the second stair section inclined beam respectively.
Optionally, the up end that the folded sheet formula was marked time be the step face of level setting, the step face be the bench board, the width of the end of encorbelmenting be 0.2 times of bench board width.
Optionally, the ladder section sloping beam is arranged along the length direction of the beam type stair body, the ladder section sloping beam is provided with beam gluten, beam bottom ribs and beam stirrups arranged at equal intervals along the length direction, and the beam gluten and the beam bottom ribs are located in the beam stirrups.
Optionally, the first node is provided with a reserved hole, and the reserved hole can be inserted with a positioning steel bar.
Optionally, the second node is lapped with the beam bottom rib or the beam surface rib by using a lapping steel bar, and the bottom end of the ladder section inclined beam has a certain stress width.
Optionally, the third node is lapped by using a lapping steel bar beam bottom rib or a beam surface rib, the beam bottom rib is bent to the supporting rabbet, and the bottom end of the ladder section oblique beam has a certain stress width.
Optionally, the step surface of the beam type stair body is embedded with a hoisting piece for field installation.
Optionally, a lifting piece for overturning is embedded in one side of the beam type stair body.
Optionally, a hoisting part for a demolding stage is embedded in the beam bottom of the beam type stair body;
optionally, the first ladder section oblique beam and the second ladder section oblique beam are both in a form of being wide at the top and narrow at the bottom.
Compared with the prior art, the invention has the following beneficial effects:
1. the folding plate type step of the concrete beam type stair is supported on the first stair section inclined beam and the second stair section inclined beam, overhanging ends are formed at two ends of the folding step, the width of each overhanging end is 0.2 times of the width of each stair section plate, the thickness of a surface layer can be reduced through reasonable stress design, the prefabricated concrete beam type stair is lighter, and the safety and the convenience of conveying and hoisting are improved.
2. The beam type stair adopts the folded plate type steps, is prefabricated by high-performance concrete, and adopts a mode of being wide at the top and narrow at the bottom by combining with the inclined beams of the stair sections, so that the beam type stair is better stressed on the whole and easier to remove the form.
3. The beam type stair disclosed by the invention is prefabricated by using the ultra-high performance concrete, the self-compactness and the prefabrication effect are good, and a certain stress width is reserved at the node, so that the beam type stair disclosed by the invention has the advantages of ultra-high mechanical property, and strong waterproofness, wear resistance and corrosion resistance.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate corresponding parts throughout the different views.
Fig. 1 is a schematic cross-sectional view of a flight stringer of a lightweight precast concrete beam type staircase according to the present invention;
fig. 2 is a schematic structural view of a lightweight precast concrete beam type staircase according to the present invention;
fig. 3 is a schematic view of an installation structure of a first node of a lightweight precast concrete beam type staircase according to the present invention;
FIG. 4 is a schematic diagram of reinforcement of a beam type staircase body of the lightweight precast concrete beam type staircase according to the present invention;
FIG. 5 is a schematic diagram of reinforcement of a beam type staircase body of the lightweight precast concrete beam type staircase according to the present invention;
fig. 6 is a schematic structural view of a lightweight precast concrete beam type staircase according to the present invention;
fig. 7 is a plan view schematically illustrating a lightweight precast concrete girder type staircase according to the present invention.
Description of the drawings: 1-node one; 2-node two; 3-node three; 4-overhanging end; 5-girder gluten; 6-beam stirrups; 7-beam bottom ribs; 8-positioning the steel bars; 9-no shrinkage mortar; 10-reserving holes; 11-overlapping the reinforcing steel bars; 12-supporting tongue-and-groove; 13-a mounting hoist; 14-turning over the hoisting piece; 15-hoisting part for demoulding stage; 16-a stairwell; 17-a ladder section stringer; 18-folding plate type step; 19-a first ladder section stringer; 20-a second ladder section inclined beam; 21-cast-in-place platform.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms described above will be understood by those of ordinary skill in the art according to the specific circumstances.
The present invention is a lightweight precast concrete beam type staircase, and the following embodiments are explained with reference to fig. 1 to 7.
The first embodiment is as follows:
a precast concrete beam type stair comprises a beam type stair body, a first supporting beam type stair body node 1, a second node 2 and a third node 3;
the prefabricated beam type stair body comprises a stair section inclined beam 17 and a folded plate type step 18, wherein the stair section inclined beam 17 comprises a first stair section inclined beam 19 and a second stair section inclined beam 20, the folded plate type step 18 is supported on the first stair section inclined beam 19 and the second stair section inclined beam 20, symmetrical overhanging ends 4 are formed on one sides of the first stair section inclined beam 19 and the second stair section inclined beam 20, the first stair section inclined beam 19 and the second stair section inclined beam 20 are symmetrically arranged in the stair section inclined beams, and therefore the formed overhanging ends 4 are also symmetrically arranged; the upper end surface of the folded plate type step 18 is a horizontally arranged step surface which is a stepped plate, and the width of the overhanging end 4 is 0.2 times of the width of the stepped plate; the stair section inclined beam 17 is arranged along the length direction of the beam type stair body, the stair section inclined beam 17 is provided with beam ribs 5, beam bottom ribs 7 and beam stirrups 6 which are arranged at equal intervals along the length direction, and the beam surface ribs 5 and the beam bottom ribs 7 are positioned in the beam stirrups 6; a reserved hole 10 is formed in the first node 1, a positioning steel bar 8 can be inserted into the reserved hole 10, and non-shrinkage mortar 9 is poured into the reserved hole 10 during installation; the second node 2 is lapped with the beam bottom rib 7 or the beam surface rib 5 by adopting a lapping reinforcing steel bar 11, and the bottom end of the ladder section inclined beam has a certain stress width; the third node 3 is lapped with a beam bottom rib 7 or a beam surface rib 5 by adopting a lapping reinforcing steel bar 11, the beam bottom rib 7 is bent to a supporting tongue-and-groove 12, and the bottom end of the ladder section oblique beam has a certain stress width; the number of the on-site installation hoisting parts 13 is 4, and hoisting point reinforcing ribs are respectively arranged at two ends of each on-site installation hoisting part; 2 hoisting pieces 14 for overturning are embedded in one side of the prefabricated beam type stair body, and the number of the hoisting pieces is 2; 4 hoisting parts 15 for demolding stages are embedded in the beam bottom of the prefabricated beam type stair body, and the number of the hoisting parts is 4; the first ladder oblique beam 19 and the second ladder oblique beam 20 are both in a form of being wide at the top and narrow at the bottom.
Example two:
a precast concrete beam type stair comprises a beam type stair body, a first supporting beam type stair body node 1, a second node 2 and a third node 3;
the beam type stair body comprises a stair section inclined beam 17 and a folded plate type step 18, the stair section inclined beam 17 comprises a first stair section inclined beam 19 and a second stair section inclined beam 20, the folded plate type step 18 is supported on the first stair section inclined beam 19 and the second stair section inclined beam 20, and cantilever ends 4 are formed on one sides of the first stair section inclined beam 19 and one side of the second stair section inclined beam 20 respectively. First bench sloping 19 and second bench sloping 20 all adopt the form of narrow down wide from top to bottom for its atress is better, and the form removal is easier, adopts width 100mm at the bottom in this embodiment, and the top is wide 115mm, and the thickness of marking time can adopt 20 ~ 50mm as required.
The precast concrete beam type stair can adopt the mould production of standing or utilize the tread to produce for the mould end, the folded plate formula 18 the up end of marking time be the tread of level setting, the tread be the bench board, in this embodiment, if adopt the mould production of standing, only need pre-buried 4 as the hoist and mount piece 15 of drawing of patterns and installation usefulness, if utilize the tread to produce for the mould end, the tread is pre-buried has on-the-spot 4 installation to hang dress spare 13, 4 pre-buried drawing of patterns stages of beam bottom are with hoist and mount piece 15 and 2 pre-buried hoist and mount pieces 14 of side that are used for the component upset, hoist and mount piece in this embodiment is for hanging the nail, when the installation, the installation gap of stair body and wall limit be 10 mm.
The width of the cantilever end 4 is 0.2 times of the width of the stair section plate, the stair section inclined beam 17 is arranged along the length direction of the beam type stair body, the stair section inclined beam 17 is provided with beam surface ribs 4, beam bottom ribs 7 and beam stirrups 6 which are arranged at equal intervals along the length direction, the beam surface ribs 4 and the beam bottom ribs 7 are located in the beam stirrups 6, and the beam stirrups 6 can adopt the form of tie bars in the embodiment.
The node I1 is provided with a reserved hole 10 and is connected with a cast-in-place part, the reserved hole 10 in the embodiment is phi 50, the positioning steel bars 8 are embedded in the prefabricated beam type stair body, the extending ends of the embedded steel bars can be inserted into the reserved hole 10, and during installation, non-shrinkage mortar 9 is filled into the reserved hole 10, and meanwhile, mortar is filled in a contact area at the bottom of the stair, and the prefabricated beam type stair is hoisted, leveled and installed in place.
The second node 2 is a ladder section connecting point, and is connected with the beam surface rib 4 and the beam bottom rib 7 respectively by the lap joint reinforcing steel bar 11, so that the stress of the connecting part is increased, and the shearing resistance of the supporting surface is enhanced. In this embodiment, the prefabricated beam type stair body can take 10mm with cast-in-place platform's perps, and the horizontal gap can take 5mm, and has set up certain atress width for beam type stair have more reasonable atress design.
Three 3's of node beam bottom muscle 7 buckle and stop at support rabbet department to adopt overlap joint reinforcing bar 11 to carry out overlap joint beam gluten 4 and carry out the overlap joint, just beam gluten 4 forms the overlap joint with another overlap joint reinforcing bar 11, makes the shearing of reinforcing holding surface, in this embodiment, prefabricated stair section can 10mm with cast-in-place platform 21's perps, the horizontal gap can 5mm 17 bottoms of stair section sloping have certain atress width.
According to the precast concrete beam type stair disclosed by the invention, as the steps are completely of the folded plate type, the positions of the stair section inclined beams are not arranged on two sides but arranged at reasonable stress positions, so that the sizes of the stair section inclined beams and the folded plate type steps are reduced, the weight of the stair section inclined beams and the folded plate type steps can be greatly reduced compared with that of the plate type stair with the same size, the weight coefficient can reach about 0.3 time, and the hoisting requirement under the condition that the existing tower crane is not upgraded can be met. The ultra-high performance concrete has ultra-high durability and ultra-high mechanical property, does not use coarse aggregate, adopts silica fume and fiber, has large cement consumption and low water-cement ratio, can be maintained at normal temperature by adopting the ultra-high efficiency water reducing agent, gradually reduces the material price, and has the advantage of low cost.
Example three:
a precast concrete beam type stair comprises a beam type stair body, a first supporting beam type stair body node 1, a second node 2 and a third node 3; girder type stair body include bench sloping 17 and folded plate formula 18 of marking time, bench sloping 17 set up along beam type stair body length direction, just bench sloping 17 set up roof beam face muscle 4, roof beam bottom muscle 7 and the roof beam stirrup 6 that the equidistant was arranged along length direction, roof beam face muscle 4 and roof beam bottom muscle 7 be located roof beam stirrup 6, roof beam stirrup 6 can adopt the form of drawknot reinforcing bar in this embodiment. Bench sloping 17 include first bench sloping 19 and second bench sloping 20, folded plate formula step 18 support in first bench sloping 19 and second bench sloping 20 on to form respectively in one side of first bench sloping 19 and second bench sloping 20 and encorbelment the end, first bench sloping 19 and second bench sloping 20 are asymmetric in the bench sloping, consequently the end 4 of encorbelmenting that forms also is asymmetric setting, the width of the end 4 of encorbelmenting be 0.2 times of bench width. First bench sloping 19 and second bench sloping 20 all adopt the form of narrow down wide from top to bottom for its atress is better, and the form removal is easier, adopts width 100mm at the bottom in this embodiment, and the top is wide 115mm, and the thickness of marking time can adopt 20 ~ 50mm as required.
The precast concrete beam type stair can adopt the mould production of standing or utilize the tread to produce for the mould end, the folded plate formula 18 the up end of marking time be the tread of level setting, the tread be the bench board, in this embodiment, if adopt the mould production of standing, only need pre-buried 4 as the hoist and mount piece 15 of drawing of patterns and installation usefulness, if utilize the tread to produce for the mould end, the tread is pre-buried has on-the-spot 4 installation to hang dress spare 13, 4 pre-buried drawing of patterns stages of beam bottom are with hoist and mount piece 15 and 2 pre-buried hoist and mount pieces 14 of side that are used for the component upset, hoist and mount piece in this embodiment is for hanging the nail, when the installation, the installation gap of stair body and wall limit be 10 mm.
The prefabricated beam type stair is characterized in that a reserved hole 10 is formed in the first node 1 and connected with a cast-in-place part, the reserved hole 10 is phi 50, positioning steel bars 8 are embedded in the prefabricated beam type stair body, the extending ends of the embedded steel bars can be inserted into the reserved hole 10, shrinkage-free mortar 9 is filled into the reserved hole 10 during installation, and meanwhile, mortar is filled in a contact area of the bottom of the stair, and the prefabricated beam type stair is hoisted, leveled and installed in place.
The second node 2 is a ladder section connecting point, and is connected with the beam surface rib 4 and the beam bottom rib 7 respectively by the lap joint reinforcing steel bar 11, so that the stress of the connecting part is increased, and the shearing resistance of the supporting surface is enhanced. In this embodiment, the prefabricated beam type stair body can take 10mm with cast-in-place platform's perps, and the horizontal gap can take 5mm, and has set up certain atress width for beam type stair have more reasonable atress design.
Three 3's of node beam bottom muscle 7 buckle and stop at support rabbet department to adopt overlap joint reinforcing bar 11 to carry out overlap joint beam gluten 4 and carry out the overlap joint, just beam gluten 4 forms the overlap joint with another overlap joint reinforcing bar 11, makes the shearing of reinforcing holding surface, in this embodiment, prefabricated stair section can 10mm with cast-in-place platform 21's perps, the horizontal gap can 5mm 17 bottoms of stair section sloping have certain atress width.
According to the precast concrete beam type stair disclosed by the invention, as the steps are completely of the folded plate type, the positions of the stair section inclined beams are not arranged on two sides but arranged at reasonable stress positions, so that the sizes of the stair section inclined beams and the folded plate type steps are reduced, the weight of the stair section inclined beams and the folded plate type steps can be greatly reduced compared with that of the plate type stair with the same size, the weight coefficient can reach about 0.3 time, and the hoisting requirement under the condition that the existing tower crane is not upgraded can be met. The ultra-high performance concrete has ultra-high durability and ultra-high mechanical property, does not use coarse aggregate, adopts silica fume and fiber, has large cement consumption and low water-cement ratio, can be maintained at normal temperature by adopting the ultra-high efficiency water reducing agent, gradually reduces the material price, and has the advantage of low cost.
In conclusion, the precast concrete beam type stair disclosed by the invention is light in weight, easy to install and transport, good in mechanical property, and strong in waterproofness, wear resistance and corrosion resistance.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples. Various configurations may omit, substitute, or add various procedures or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described, and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Further, elements therein may be updated as technology evolves, i.e., many elements are examples and do not limit the scope of the disclosure or claims.
Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, for example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.
In conclusion, it is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that these examples are illustrative only and are not intended to limit the scope of the invention. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (10)
1. A precast concrete beam type stair is characterized by comprising a precast beam type stair body, a first supporting beam type stair body node, a second supporting beam type stair body node and a third supporting beam type stair body node;
the prefabricated beam type stair body comprises a stair section inclined beam and a folding plate type step, the stair section inclined beam comprises a first stair section inclined beam and a second stair section inclined beam, the folding plate type step is supported on the first stair section inclined beam and the second stair section inclined beam, and cantilever ends are formed on one sides of the first stair section inclined beam and one side of the second stair section inclined beam respectively.
2. A precast concrete beam type staircase as defined in claim 1, wherein the upper end surface of the flap type step is a horizontally disposed tread surface, the tread surface is a step plate, and the width of the cantilever end is 0.2 times the width of the step plate.
3. A precast concrete beam stair as claimed in any one of the preceding claims, wherein the stair flight is provided along the length of the beam stair body, the stair flight is provided with beam ribs, beam bottom ribs and beam stirrups arranged at equal intervals along the length, and the beam ribs and the beam bottom ribs are positioned in the beam stirrups.
4. A precast concrete beam stairway as claimed in any one of the preceding claims, wherein a first node is provided with a pre-cut hole into which a positioning bar can be inserted.
5. A precast concrete beam type staircase as defined in any one of the preceding claims, wherein the second node is overlapped with the bottom or face reinforcement by using an overlap reinforcement and has a certain stress width.
6. A precast concrete beam stair as defined in any one of the preceding claims, wherein the third node is overlapped by using an overlap reinforcement beam bottom reinforcement or a beam face reinforcement, and the beam bottom reinforcement is bent to the support rabbet and has a certain stress width.
7. A precast concrete beam stairway as claimed in any one of the preceding claims, wherein a step surface of the precast beam stairway body is pre-embedded with an installation hanger.
8. A precast concrete beam stairway as claimed in any one of the preceding claims, wherein overturning lifting pieces are embedded in one side of the body of the precast beam stairway.
9. A precast concrete beam stairway as claimed in any one of the preceding claims, wherein a stripper stage hoist is embedded in the bottom of the beam of the precast beam stairway body.
10. A precast concrete beam stairway as claimed in any one of the preceding claims, wherein said first and second ladder stringers are both wide in top and narrow in bottom.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112663882A (en) * | 2020-12-08 | 2021-04-16 | 中建西部建设股份有限公司 | Light and thin type beam type prefabricated staircase made of ultra-high performance concrete and forming process thereof |
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| EP2868835A1 (en) * | 2013-11-05 | 2015-05-06 | Obrist Baugeräte AG | Stairs |
| CN104164952A (en) * | 2014-07-23 | 2014-11-26 | 南京长江都市建筑设计股份有限公司 | Hinge joint connecting structure of novel prefabricated shear stairway |
| CN104963469A (en) * | 2015-01-16 | 2015-10-07 | 北新集团建材股份有限公司 | Stairway installation method |
| CN205777185U (en) * | 2016-05-31 | 2016-12-07 | 西安建构实业有限责任公司 | A kind of full assembling concrete beam-type stair |
| CN108166691A (en) * | 2018-02-11 | 2018-06-15 | 山东省建筑科学研究院 | A kind of precast prestressed concrete beam formula stair and making construction method |
| CN207959751U (en) * | 2018-02-11 | 2018-10-12 | 山东省建筑科学研究院 | A kind of precast prestressed concrete beam formula stair |
| CN110219423A (en) * | 2019-06-12 | 2019-09-10 | 赵东昕 | A kind of prefabricated stringer type stairway |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112663882A (en) * | 2020-12-08 | 2021-04-16 | 中建西部建设股份有限公司 | Light and thin type beam type prefabricated staircase made of ultra-high performance concrete and forming process thereof |
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