CN215948731U - Precast concrete stair with assembled fitment surface course - Google Patents

Abstract

The utility model provides a prefabricated concrete stair with an assembled decoration surface layer, which comprises a prefabricated bench and the decoration surface layer arranged on the upper surface of the prefabricated bench, wherein one end of the prefabricated bench is fixedly arranged on a first ladder beam, the other end of the prefabricated bench is fixedly arranged on a second ladder beam, and the decoration surface layer is sequentially connected with the surface layer of the first ladder beam and the surface layer of the second ladder beam. The prefabricated staircase has the advantages that the prefabricated decoration surface layer is considered in advance in the production of the prefabricated staircase, the staircase main body and the decoration surface layer are completed in one step in a factory, the decoration surface layer can be sequentially connected with the surface layer of the first ladder beam and the surface layer of the second ladder beam only by fixedly mounting the prefabricated ladder section and the first ladder beam during construction, and the construction efficiency is high.

Description

Precast concrete stair with assembled fitment surface course

Technical Field

The utility model relates to the field of fabricated buildings, in particular to a precast concrete stair with a fabricated decoration surface layer.

Background

The fabricated building is a building which is formed by transferring a large amount of field operation work in the traditional construction mode to a factory, processing and manufacturing building components and accessories (such as floor slabs, wall slabs, stairs, balconies and the like) in the factory, transporting the components and accessories to a building construction site, and assembling and installing the components and the accessories on the site in a reliable connection mode. The assembly type building is a representative of a modern industrial production mode because of adopting standardized design, factory production, assembly construction, informatization management and intelligent application.

The more and more the assembly type buildings are required in modern building engineering, the prefabricated stairway is the assembly type component which is most applied. The precast concrete stairs on the market at present do not have decoration surface layers, are delivered by fair-faced concrete, and cannot meet the high standard requirement of construction units on decoration; in addition, in the construction process of the fabricated building, after the precast concrete stairs are installed, owners can realize that the use requirements of the single fair-faced concrete cannot be met, and then the precast concrete stairs are chiseled on site, a cement mortar surface layer is constructed by a wet method, and a tile paving decoration surface layer is paved. Not only influences the efficiency of construction but also increases the cost, still deviates from the original intention of assembled building to some extent.

In view of the above, there is a need to develop a precast concrete stairway with a fabricated finishing layer to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a prefabricated concrete stair with an assembled decoration surface layer, wherein the assembled decoration surface layer is considered in advance in the production of the prefabricated stair, and a stair body and the decoration surface layer are finished at one time in a factory, so that secondary wet operation and reworking of a construction site are avoided.

The technical scheme for realizing the purpose of the utility model is as follows:

the utility model provides a precast concrete stair with assembled fitment surface course, including prefabricated bench, set up in the fitment surface course of prefabricated bench upper surface, the one end of prefabricated bench sets firmly in first terraced roof beam, the other end of prefabricated bench sets firmly in second terraced roof beam, the surface course that the fitment surface course connects first terraced roof beam and the surface course of second terraced roof beam in proper order.

In a possible implementation manner, a filling layer is arranged between the side surface of one end of the prefabricated bench and the side surface of the first ladder beam, and a filling layer is also arranged between the bottom surface of one end of the prefabricated bench and the bottom surface of the first ladder beam;

and a filling layer is arranged between the side surface of the other end of the prefabricated ladder section and the side surface of the second ladder beam, and a filling layer is also arranged between the bottom surface of the other end of the prefabricated ladder section and the bottom surface of the second ladder beam.

In a possible implementation manner, a first filling layer is arranged between the prefabricated bench and the first ladder beam, and a second filling layer is arranged between the prefabricated bench and the second ladder beam;

the first filling layer and the second filling layer respectively comprise a first cement mortar leveling layer, a first polyphenyl filling layer, a second polyphenyl filling layer and a second cement mortar leveling layer;

first cement mortar screed-coat and first polyphenyl filling layer set up in between the bottom surface of prefabricated bench and the upper surface of first ladder beam/second ladder beam, second polyphenyl filling layer and second cement mortar screed-coat set up in between the side of prefabricated bench and the side of first ladder beam/second ladder beam.

In one possible implementation, the second polyphenylene filler layer is internally wrapped with PE rods.

In one possible implementation, the first filling layer further includes an oil felt layer located between the first cement mortar leveling layer and the upper surface of the first ladder beam.

In a possible implementation manner, the prefabricated bench section is fixedly connected with the first ladder beam through an anchoring part;

the bottom end of the anchoring part is provided with an anchor head, and the bottom of the anchoring part and the anchor head extend into the first ladder beam/the second ladder beam;

the top end of the anchoring piece is located inside the prefabricated bench section, a grouting material layer is filled around the anchoring piece, a mortar blocking layer is filled at the top end of the anchoring piece, and the upper surface of the mortar blocking layer is flush with the upper surface of the prefabricated bench section.

In one possible implementation, the first ladder beam is located below the second ladder beam;

the first ladder beam and the second ladder beam are both connected with a floor beam through a platform plate, and the floor beam is also connected with a floor slab;

the upper surface of the first ladder beam/the upper surface of the second ladder beam are flush with the upper surface of the platform plate;

the floor roof beam with the upper surface of landing slab all is provided with the surface course, the fitment surface course with the surface course of landing slab is in the same direction as connecing.

In one possible implementation mode, a plurality of prefabricated stair sections are spliced into a prefabricated concrete stair;

the adjacent floors are communicated through a plurality of prefabricated ladders, and the planar shapes of the prefabricated ladders are broken lines.

In one possible implementation, the decorative finish is a wood floor finish;

fitment surface course with be equipped with dampproof film, multiply wood and wood joist between the prefabricated bench in proper order, wood joist with prefabricated bench is connected, the fitment surface course with the dampproof film contact.

In one possible implementation, the decorative finish is a tile finish;

fitment surface course with be equipped with extruded polystyrene board, structure glue film, calcium silicate board and metalwork between the prefabricated bench in proper order, the metalwork with prefabricated bench is connected, the fitment surface course with the contact of extruded polystyrene board.

Compared with the prior art, the utility model has the beneficial effects that:

the prefabricated staircase has the advantages that the prefabricated decoration surface layer is considered in advance in the production of the prefabricated staircase, the staircase main body and the decoration surface layer are completed in one step in a factory, the decoration surface layer can be sequentially connected with the surface layer of the first ladder beam and the surface layer of the second ladder beam only by fixedly mounting the prefabricated ladder section and the first ladder beam during construction, and the construction efficiency is high.

Drawings

FIG. 1 is a schematic structural view of a precast concrete stair with an assembled finishing layer according to an embodiment of the present invention;

FIG. 2 is a node diagram of the precast concrete stairway in FIG. 1;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is an enlarged view of portion B of FIG. 2;

FIG. 5 is a cross-sectional view taken at C-C of FIG. 4;

FIG. 6 is a schematic view of a first finishing layer;

FIG. 7 is a schematic view of a second finishing layer;

reference numerals: 1-prefabricating a bench; 2-finishing the surface layer; 3-a first ladder beam; 4-a second ladder beam; 5-surface layer; 6-a first filling layer; 7-a second filling layer; 8-a platform plate; 9-a floor beam; 10-a floor slab; 100-a first cement mortar leveling layer; 200-a first polyphenylen fill layer; 300-a second polyphenylene fill layer; 400-second cement mortar leveling layer; 500-PE rod; 600-a layer of felt; 700-an anchor member; 800-anchor head; 900-grouting layer; 1000-mortar blocking layer.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the utility model, the meaning of "a plurality" is two or more unless otherwise specified.

Because the precast concrete stair on the market at present does not possess the fitment surface course, all deliver with the fair-faced concrete, can't satisfy the high standard requirement of construction unit to the fitment, in addition in the assembly type building work progress, the precast concrete stair just realizes that simple fair-faced concrete can't satisfy its operation requirement after the installation, then begin on-the-spot chisel hair precast concrete stair, wet construction cement mortar surface course and spread tile fitment surface course, both influenced the efficiency of construction and increased cost. The method has the advantages that the possibility of the assembly type decoration surface layer is considered in advance in the production of the prefabricated staircase, after the hoisting construction of the staircase is completed, various selectable assembly type decoration surface layers can be conveniently constructed by adopting dry operation, so that the original purpose of the assembly type building is really realized, the indoor decoration attractiveness is improved, the manual wet decoration operation is reduced, the construction efficiency is improved, the emission is reduced, and the method is highly consistent with the dual-carbon policy target.

Referring to fig. 1 and 2, an embodiment of the present invention provides a precast concrete stair with an assembled decoration surface layer 2, including a precast stair section 1 and a decoration surface layer 2 disposed on an upper surface of the precast stair section 1, where one end of the precast stair section 1 is fixedly disposed on a first stair beam 3, the other end of the precast stair section 1 is fixedly disposed on a second stair beam 4, and the decoration surface layer 2 is sequentially connected to a surface layer 5 of the first stair beam 3 and a surface layer 5 of the second stair beam 4. With continued reference to fig. 1 and 2, the precast concrete stairway according to the embodiment of the utility model is a corner stairway.

The decoration surface layer 2 of the prefabricated bench 1 corresponding to the tread area is preferably a wood floor surface layer, and the decoration surface layer 2 of the prefabricated bench 1 corresponding to the kick plate area is also preferably a wood floor surface layer. Referring to fig. 6, the connection structure of the wood floor surface layer and the tread area of the prefabricated bench 1 specifically includes: the wood floor surface layer is in contact with the moisture-proof film. The tip of preferred timber apron surface course still is fixed through the antislip strip with the tip of prefabricated bench 1, and preferred antislip strip is finished product aluminum alloy antislip strip. Referring to fig. 6, the connecting structure of the wood floor surface layer and the kick plate area of the prefabricated bench 1 specifically includes: the finished product wood floor backplate grooving of timber apron surface course, be equipped with metal pendant and wood keel between timber apron surface course and the prefabricated bench in proper order, the wood keel passes through expansion bolts with prefabricated bench and is connected, and the metal pendant sets firmly the timber apron surface course in the wood keel.

The decoration surface layer 2 of the prefabricated bench 1 corresponding to the tread area is preferably a ceramic tile surface layer, and the decoration surface layer 2 of the prefabricated bench 1 corresponding to the kick plate area is also preferably a ceramic tile surface layer. Referring to fig. 7, the connection structure of the tile surface layer and the corresponding tread area of the prefabricated bench 1 specifically includes: be equipped with extruded polystyrene board (glass fiber coating), structure glue film (structural adhesive), calcium silicate board and metalwork (adjustable lower margin subassembly is built on stilts) in proper order between ceramic tile surface course and the prefabricated bench, metalwork (adjustable lower margin subassembly is built on stilts) is connected with prefabricated bench, ceramic tile surface course and extruded polystyrene board contact. The tip of preferred timber apron surface course still is fixed through the antislip strip with the tip of prefabricated bench 1, and preferred antislip strip is finished product aluminum alloy antislip strip. With reference to fig. 7, the connection structure between the tile surface layer and the corresponding kick plate area of the prefabricated bench 1 specifically includes: the finished product ceramic tile backplate cut groove of ceramic tile surface course is equipped with metal pendant and aluminum alloy fossil fragments between ceramic tile surface course and the prefabricated bench in proper order, and aluminum alloy fossil fragments pass through expansion bolts with prefabricated bench to be connected, and the metal pendant sets firmly the ceramic tile surface course in aluminum alloy fossil fragments.

Stairways in the general sense include stairway sections, landings (landings and intermediate landings). The stair sections are the main use and bearing parts of the stair, are inclined components which are connected with two platforms with different elevations, and are composed of a plurality of continuous steps, and are commonly called stair sections or stair runs. The horizontal upper surface of the step is called a tread, and the vertical part of the tread is called a kickplate. The space between the stair sections and the platform is called a stair well, and the size of the stair well is determined according to the requirement of the supporting template during stair construction and the space size meeting the staircase. The platform is a horizontal part connecting the floor and the end part of the stair section, is mainly used for solving the problem of steering of the stair section, and enables people to have a buffer rest when going upstairs and downstairs. The middle platform is a platform positioned between two floors and has the functions of solving the turning of the stair sections and relieving fatigue. And the platform level with the floor level serves the function of buffering and distributing the flow of people from the building to the floors, called floor platform.

The precast concrete stair provided by the embodiment of the utility model is used as one of vertical traffic facilities of a building, and has the primary function of connecting up and down traffic; secondly, the precast concrete stair still plays the effect of bearing as building main body structure, in addition, precast concrete stair have functions such as safe evacuation, pleasing to the eye decoration. The stair sections of the embodiment of the utility model adopt a prefabricated form, so the prefabricated stair sections are called prefabricated stair sections 1 in the embodiment of the utility model. When the bottom end of the prefabricated bench 1 is connected with a floor platform and the top end of the prefabricated bench 1 is connected with a middle platform, a first bench beam 3 is arranged on the floor platform, a second bench beam 4 is arranged on the middle platform, and the prefabricated bench 1 is fixed by the first bench beam 3 and the second bench beam 4. When the bottom end of the prefabricated bench 1 is connected with the middle platform and the top end of the prefabricated bench 1 is connected with the floor platform, the middle platform is provided with a first ladder beam 3, the floor platform is provided with a second ladder beam 4, and the prefabricated bench 1 is fixed by the first ladder beam 3 and the second ladder beam 4.

In the embodiment of the utility model, the assembled decoration surface layer 2 is considered in advance in the production of the prefabricated staircase, the staircase main body and the decoration surface layer 2 are completed in one step in a factory, and the decoration surface layer 2 can be sequentially connected with the surface layer 5 of the first ladder beam 3 and the surface layer 5 of the second ladder beam 4 only by fixedly installing the prefabricated ladder section 1 with the first ladder beam 3 and the second ladder beam 4 during construction, so that the prefabricated staircase has the advantage of high construction efficiency.

Referring to fig. 2, 3 and 4, a filling layer is arranged between a side surface of one end of the prefabricated bench 1 and a side surface of the first ladder beam 3 according to the embodiment of the present invention, and a filling layer is also arranged between a bottom surface of one end of the prefabricated bench 1 and a bottom surface of the first ladder beam 3; a filling layer is arranged between the side face of the other end of the prefabricated ladder section 1 and the side face of the second ladder beam 4, and a filling layer is also arranged between the bottom face of the other end of the prefabricated ladder section 1 and the bottom face of the second ladder beam 4.

With continuing reference to fig. 3 and 4, a first filling layer 6 is disposed between the prefabricated bench 1 and the first ladder beam 3, and a second filling layer 7 is disposed between the prefabricated bench 1 and the second ladder beam 4; the first filling layer 6 and the second filling layer 7 respectively comprise a first cement mortar leveling layer 100, a first polyphenyl filling layer 200, a second polyphenyl filling layer 300 and a second cement mortar leveling layer 400; first cement mortar screed-coat 100 and first polyphenyl filling layer 200 set up between the bottom surface of prefabricated bench 1 and the upper surface of first ladder beam 3/second ladder beam 4, and second polyphenyl filling layer 300 and second cement mortar screed-coat 400 set up between the side of prefabricated bench 1 and the side of first ladder beam 3/second ladder beam 4.

More specifically, referring to fig. 3, fig. 3 is a connection structural diagram of the prefabricated bench 1 and the second ladder beam 4, when the prefabricated bench 1 and the second ladder beam 4 of the embodiment of the present invention are connected, a second filling layer 7 is disposed between the prefabricated bench 1 and the second ladder beam 4, and the second filling layer 7 includes a first cement mortar leveling layer 100, a first polyphenyl filling layer 200, a second polyphenyl filling layer 300, and a second cement mortar leveling layer 400; first cement mortar screed-coat 100 and first polyphenyl filling layer 200 set up between the bottom surface of prefabricated bench 1 and the upper surface of second terraced roof beam 4, first cement mortar screed-coat 100 is located first polyphenyl filling layer 200 side, first cement mortar screed-coat 100 is close to second polyphenyl filling layer 300 and sets up, second polyphenyl filling layer 300 and second cement mortar screed-coat 400 set up between the side of prefabricated bench 1 and the side of second terraced roof beam 4, second cement mortar screed-coat 400 is located second polyphenyl filling layer 300 top.

More specifically, referring to fig. 4, fig. 4 is a connection structural diagram of the prefabricated bench 1 and the first ladder beam 3, when the prefabricated bench 1 of the embodiment of the present invention is connected to the first ladder beam 3, a first filling layer 6 is disposed between the prefabricated bench 1 and the first ladder beam 3, and the first filling layer 6 includes a first cement mortar leveling layer 100, a second polyphenyl filling layer 300, and a second cement mortar leveling layer 400; first cement mortar screed-coat 100 sets up between the bottom surface of prefabricated bench 1 and the upper surface of first terraced beam 3, and second polyphenyl filling layer 300 and second cement mortar screed-coat 400 set up between the side of prefabricated bench 1 and the side of second terraced beam 4, and second cement mortar screed-coat 400 is located second polyphenyl filling layer 300 top.

With continued reference to fig. 3 and 4, the second poly-benzene filled layer 300 of the embodiment of the present invention is wrapped with PE rods 500. With continued reference to fig. 3, the second poly-benzene filled layer 300 of the second filled layer 7 is wrapped with PE rods 500. With continued reference to fig. 4, the second poly-benzene filled layer 300 of the first filled layer 6 is wrapped with PE rods 500. The PE rod 500 of the embodiment of the utility model is named High sensitivity Polyethylene in English and is named Polyethylene rod in Chinese. The PE rod 500 is a highly crystalline, non-polar thermoplastic material. The appearance of the original HDPE is milky white, and the micro-thin section is semitransparent to a certain degree. Has good heat resistance and cold resistance, good chemical stability, higher rigidity and toughness and good mechanical strength.

With continued reference to fig. 4, the first filling layer 6 of the embodiment of the present invention includes a linoleum layer 600 in addition to the first cement mortar leveling layer 100, the second polystyrene filling layer 300 and the second cement mortar leveling layer 400, and the linoleum layer 600 is located between the first cement mortar leveling layer 100 and the upper surface of the first ladder beam 3. The oil felt layer 600 of the embodiment of the present invention is a building material made of a felt or a thick paper blank made of animal wool or plant fiber and impregnated with asphalt, and has water-proof, tough, and waterproof and moisture-proof functions.

With continuing reference to fig. 3, 4 and 5, the prefabricated bench 1 and the first ladder beam 3, and the prefabricated bench 1 and the second ladder beam 4 according to the embodiment of the present invention are further fixedly connected by the anchor 700; the bottom end of the anchoring member 700 is provided with an anchoring head 800, and the bottom of the anchoring member 700 and the anchoring head 800 extend into the first ladder beam 3/the second ladder beam 4; the top end of the anchoring member 700 is located inside the prefabricated bench 1, a grouting material layer 900 is filled around the anchoring member 700, a mortar blocking layer 1000 is filled at the top end of the anchoring member 700, and the upper surface of the mortar blocking layer 1000 is flush with the upper surface of the prefabricated bench 1.

The embodiment of the utility model considers the possibility of the assembled decoration surface layer 2 in advance in the production of the prefabricated staircase, and completes the staircase main body and the decoration surface layer 2 in one step in a factory, thereby avoiding secondary wet operation and reworking on a construction site, and really realizing the original purpose of the assembled building.

With continued reference to fig. 1 and 2, the first ladder beam 3 of the embodiment of the utility model is located below the second ladder beam 4; the first ladder beam 3 and the second ladder beam 4 are both connected with a floor beam 9 through a platform plate 8, and the floor beam 9 is also connected with a floor slab 10; the upper surface of the first ladder beam 3/the upper surface of the second ladder beam 4 are flush with the upper surface of the platform plate 8; the upper surfaces of the floor slab 10, the floor beam 9 and the platform plate 8 are all provided with surface layers 5, and the decoration surface layers 2 are sequentially connected with the surface layers 5 of the platform plate 8.

Referring to fig. 1, a plurality of prefabricated staircases 1 of the embodiment of the utility model are assembled into a prefabricated concrete staircase; the adjacent floors are communicated through a plurality of prefabricated ladders 1, and the planar shapes of the prefabricated ladders 1 are broken lines.

The problems of the existing precast concrete staircases mainly include: 1) all prefabricated concrete stairs on the market do not have decoration surface layers, are delivered by bare concrete and cannot meet the high standard requirement of construction units on decoration; 2) in the project construction process, after the precast concrete stair is installed, the owner realizes that the pure fair-faced concrete can not meet the use requirement of the precast concrete stair, and then the on-site chiseling of concrete and the wet paving of the tile decoration surface layer are started. The above conditions affect the construction efficiency, increase the cost and deviate from the original intention of the dry-process specialty of the assembly type parts.

The embodiment of the utility model considers the possibility of the assembly type decoration surface layer in advance in the production of the prefabricated staircase, and after the hoisting construction of the staircase is completed, various selectable assembly type decoration surface layers can be constructed by adopting dry operation conveniently, so that the original purpose of the assembly type building is realized truly, the indoor decoration aesthetic degree is improved, the manual wet decoration operation is reduced, the construction efficiency is improved, the emission is reduced, and the height is consistent with the target height of a double-carbon policy.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. The utility model provides a precast concrete stair with assembled fitment surface course, its characterized in that, including prefabricated bench, set up in the fitment surface course of prefabricated bench upper surface, the one end of prefabricated bench sets firmly in first terraced roof beam, the other end of prefabricated bench sets firmly in the second terraced roof beam, the fitment surface course is in the same direction as the surface course that connects the surface course of first terraced roof beam and the surface course of second terraced roof beam.

2. The precast concrete stair of claim 1, wherein a filling layer is arranged between the side surface of one end of the precast bench and the side surface of the first stair beam, and a filling layer is also arranged between the bottom surface of one end of the precast bench and the bottom surface of the first stair beam;

and a filling layer is arranged between the side surface of the other end of the prefabricated ladder section and the side surface of the second ladder beam, and a filling layer is also arranged between the bottom surface of the other end of the prefabricated ladder section and the bottom surface of the second ladder beam.

3. The precast concrete stair of claim 2, wherein a first filling layer is arranged between the precast bench and the first stair beam, and a second filling layer is arranged between the precast bench and the second stair beam;

the first filling layer and the second filling layer respectively comprise a first cement mortar leveling layer, a first polyphenyl filling layer, a second polyphenyl filling layer and a second cement mortar leveling layer;

first cement mortar screed-coat and first polyphenyl filling layer set up in between the bottom surface of prefabricated bench and the upper surface of first ladder beam/second ladder beam, second polyphenyl filling layer and second cement mortar screed-coat set up in between the side of prefabricated bench and the side of first ladder beam/second ladder beam.

4. The precast concrete stair of claim 3, wherein the second poly-benzene filling layer is internally wrapped with PE rods.

5. The precast concrete stair of claim 3, wherein the first filling layer further comprises an oil felt layer, the oil felt layer being located between the first cement mortar leveling layer and the upper surface of the first ladder beam.

6. The precast concrete stair of claim 2, wherein the precast stair sections are fixedly connected with the first stair beam through an anchoring member;

the bottom end of the anchoring part is provided with an anchor head, and the bottom of the anchoring part and the anchor head extend into the first ladder beam/the second ladder beam;

the top end of the anchoring piece is located inside the prefabricated bench section, a grouting material layer is filled around the anchoring piece, a mortar blocking layer is filled at the top end of the anchoring piece, and the upper surface of the mortar blocking layer is flush with the upper surface of the prefabricated bench section.

7. The precast concrete stair of claim 1, wherein the first ladder beam is located below the second ladder beam;

the first ladder beam and the second ladder beam are both connected with a floor beam through a platform plate, and the floor beam is also connected with a floor slab;

the upper surface of the first ladder beam/the upper surface of the second ladder beam are flush with the upper surface of the platform plate;

the floor roof beam with the upper surface of landing slab all is provided with the surface course, the fitment surface course with the surface course of landing slab is in the same direction as connecing.

8. The precast concrete stair of claim 1, wherein a plurality of the precast stair sections are assembled into a precast concrete stair;

the adjacent floors are communicated through a plurality of prefabricated ladders, and the planar shapes of the prefabricated ladders are broken lines.

9. The precast concrete stair of claim 1, wherein the finishing surface is a wood floor surface;

fitment surface course with be equipped with dampproof film, multiply wood and wood joist between the prefabricated bench in proper order, wood joist with prefabricated bench is connected, the fitment surface course with the dampproof film contact.

10. The precast concrete stair of claim 1, wherein the finishing finish is a tile finish;

fitment surface course with be equipped with extruded polystyrene board, structure glue film, calcium silicate board and metalwork between the prefabricated bench in proper order, the metalwork with prefabricated bench is connected, the fitment surface course with the contact of extruded polystyrene board.

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