Prefabricated part assembly type outdoor step

Abstract

The utility model discloses a prefabricated part assembly type outdoor step which comprises a prefabricated UHPC base, a prefabricated UHPC left edge beam, a prefabricated UHPC right edge beam, a prefabricated UHPC platform plate and a plurality of prefabricated UHPC foot pedals, and the prefabricated UHPC left edge beam and the prefabricated UHPC right edge beam are symmetrically and fixedly connected to the two ends of the prefabricated UHPC base. The prefabricated UHPC platform plate is fixedly connected to the platform face of the prefabricated UHPC left beam and the platform face of the prefabricated UHPC right beam, and the multiple prefabricated UHPC foot pedals are fixed to the step face of the prefabricated UHPC left beam and the step face of the prefabricated UHPC right beam. The two first stand columns on the rear side are located at the two ends of a rear side frame of the prefabricated UHPC base bottom frame. Baffles for preventing the prefabricated UHPC platform plate and the multiple prefabricated UHPC foot pedals from moving outwards are arranged on the outer side edges of the prefabricated UHPC edge beams. According to the prefabricated part assembly type outdoor step, local abrasion and cracking can be prevented, the service life can be greatly prolonged, and integrity, firmness and stability are good.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, and specifically relates to a precast component assembled outdoor step. Background Art

[0002] Outdoor steps are widely used as buildings for the height difference transition between buildings and roads. There are various types and different structures of existing outdoor steps, and the application of precast component assembled outdoor steps is also relatively common.

[0003] However, there is still room for improvement in the existing precast component assembled outdoor steps. For example: 1. The reinforced concrete precast parts still use ordinary concrete precast, and local wear and cracking often occur, seriously affecting normal use and shortening the service life. 2. There is no overall precast foundation for the steps. During assembly, it is highly dependent on the on-site geographical environment, and the integrity, firmness and stability of the outdoor steps are insufficient; the quick assembly performance is also insufficient, affecting the construction efficiency. 3. Facing different heights, the precast components need to be replaced, and the versatility of the precast components is insufficient. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a precast component assembled outdoor step that can prevent local wear and cracking, can greatly improve the service life, and has good integrity, firmness and stability.

[0005] The technical solution of the utility model is to provide a precast component assembled outdoor step, including a precast UHPC base, a precast UHPC left beam, a precast UHPC right beam, a precast UHPC platform plate and multiple precast UHPC tread plates. The precast UHPC left beam and the precast UHPC right beam are symmetrically fixedly connected to both ends of the precast UHPC base. The precast UHPC platform plate is fixedly connected to the platform surfaces of the precast UHPC left beam and the precast UHPC right beam. Multiple precast UHPC tread plates are fixed on the stepped surfaces of the precast UHPC left beam and the precast UHPC right beam.

[0006] After adopting the above structure, the precast component assembled outdoor steps of the present utility model have the following advantages: Since the base, the left beam, the right beam, the platform slab and the tread slab are all made of precast UHPC, the defects of using ordinary concrete in the prior art are overcome, and the high toughness, high density, corrosion resistance and other properties of UHPC, that is, ultra-high performance concrete, are fully utilized, which can prevent local wear and cracking and can greatly improve the service life of outdoor steps. Since the precast integral UHPC base is adopted, the two side beams are fixed to both ends of the UHPC base, and the precast UHPC platform slab and multiple precast UHPC tread slabs are fixed to the two side beams. During assembly, there is no dependence on the on-site geographical environment, and the integrity, firmness and stability of the outdoor steps are all good. Moreover, the number of components is relatively small, the connection is convenient and fast, and the construction efficiency of assembly connection is relatively high. Also, because the components are reasonably designed, in the face of different heights, only the precast UHPC left beam and the precast UHPC right beam need to be replaced to meet the needs of different heights, and the versatility is relatively strong, and the construction cost is relatively saved.

[0007] Further, the precast UHPC base includes a rectangular bottom frame and two first columns fixed to the rear side frame of the rectangular bottom frame. At the top of one first column and at the top of the same end of the front side frame of the rectangular bottom frame, there is a first vertical steel bar embedded and used for inserting into the reserved hole of the precast UHPC left beam and used for grouting for anchoring; at the top of the other first column and at the top of the same end of the front side frame of the rectangular bottom frame, there is also a first vertical steel bar embedded and used for inserting into the reserved hole of the precast UHPC left beam and used for grouting for anchoring. After adopting the above connection structure, the connection between the two precast UHPC side beams and the precast UHPC base is more convenient and faster, further ensuring the technical effects of high construction efficiency of assembly connection, and good integrity, firmness and stability of the outdoor steps.

[0008] Further, there are embedded horizontal steel bars on the building foundation platform, and there are reserved horizontal holes on both first columns for inserting into the embedded horizontal steel bars and then grouting for anchoring. After adopting the above structure, the connection between the outdoor steps and the building foundation platform is firm and reliable, further improving the integrity, firmness and stability of the precast component assembled outdoor steps.

[0009] Further, the two first columns at the rear are located at both ends of the rear side frame of the rectangular bottom frame of the precast UHPC base. After adopting the above structure, both the length space of the bottom frame of the precast UHPC base is fully utilized, and the width of the outdoor steps can be maximally widened.

[0010] Furthermore, the cross-section of each precast UHPC tread plate is an L-shaped plate. The vertical plate of the L-shaped plate is attached to the vertical surface of the stepped surface of the precast UHPC left beam and the precast UHPC right beam, and the horizontal plate of the L-shaped plate is attached to the horizontal surface of the stepped surface of the precast UHPC left beam and the precast UHPC right beam. After adopting the above structure, the connection between the precast UHPC platform plate, multiple precast UHPC tread plates and the two precast UHPC side beams is more convenient and faster, and the firmness and stability of the connection are better.

[0011] Furthermore, there is a left baffle on the left side of the precast UHPC left beam to prevent the precast UHPC platform plate and multiple precast UHPC tread plates from moving to the left, and there is a right baffle on the right side of the precast UHPC right beam to prevent the precast UHPC platform plate and multiple precast UHPC tread plates from moving to the right. After adopting the above structure, the connection between the precast UHPC platform plate, multiple precast UHPC tread plates and the two precast UHPC side beams is more convenient and faster, and the firmness and stability of the connection are better.

[0012] Furthermore, there are multiple first steel plates embedded at both ends of the precast UHPC platform plate and used for fixing the handrail. The bottom end of the first steel plate is fixed with a second vertical steel bar for inserting into the corresponding blind holes filled with cement slurry in the precast UHPC left beam and the precast UHPC right beam for anchoring. After adopting the above structure, it not only saves materials relatively, but also makes the connection between the handrail and the precast UHPC platform plate, and between the precast UHPC platform plate and the two precast UHPC side beams more convenient and faster, and the firmness and stability of the connection are better.

[0013] Furthermore, there is one second steel plate embedded at both ends of each precast UHPC tread plate and used for fixing the handrail. The bottom end of the second steel plate is fixed with a third vertical steel bar for inserting into the corresponding blind holes filled with cement slurry in the precast UHPC left beam and the precast UHPC right beam for anchoring. After adopting the above structure, it not only saves materials relatively, but also makes the connection between the handrail and multiple precast UHPC tread plates, and between multiple precast UHPC tread plates and the two precast UHPC side beams more convenient and faster, and the firmness and stability of the connection are better.

[0014] Furthermore, this precast component assembled outdoor step also includes a handrail. The handrail is welded by multiple vertical steel pipes, multiple horizontal steel pipes and multiple inclined steel pipes. The bottom ends of some of the multiple vertical steel pipes are welded and fixed to the first steel plate, and the bottom ends of some of the multiple vertical steel pipes are welded and fixed to the second steel plate. After adopting the above structure, the handrail can not only fully play the role of the handrail and safety, but also its assembly connection with the precast UHPC platform plate and multiple precast UHPC tread plates is more convenient and faster, and the firmness and stability of the connection are better.

[0015] Furthermore, the prefabricated component assembled outdoor steps further include a prefabricated UHPC middle beam; the prefabricated UHPC base further includes a second upright column fixed in the middle of the rear side frame of the rectangular bottom frame. At the top of the second upright column and at the top in the middle of the front side frame of the rectangular bottom frame, there is a fourth vertical steel bar embedded and used for inserting into the reserved hole of the prefabricated UHPC middle beam and for grouting to anchor. After adopting the above structure, when the width of the prefabricated component assembled outdoor steps is relatively large, such as exceeding 1.6 meters, it can provide intermediate support in the middle of the width for the UHPC platform slab and multiple prefabricated UHPC tread plates, further ensuring the firmness, good mechanical properties and safety of the assembled outdoor steps, and can further extend the service life of the assembled outdoor steps. Description of the Drawings

[0016] Figure 1 is a three-dimensional structural schematic diagram of the prefabricated component assembled outdoor steps of the present utility model.

[0017] Figure 2 is Figure 1 the side sectional structural schematic diagram in

[0018] Figure 3 is a three-dimensional structural schematic diagram of the prefabricated UHPC base in the present utility model.

[0019] Figure 4 is a three-dimensional structural schematic diagram of the prefabricated UHPC side beam in the present utility model (the left side beam is shown in the figure. It is not difficult to understand that the structure of the right side beam is the same as that of the left side beam, only the position is symmetrical, such as the right side beam is the right baffle).

[0020] Figure 5 is a three-dimensional structural schematic diagram of the prefabricated UHPC middle beam in the present utility model.

[0021] Figure 6 is a three-dimensional structural schematic diagram of the prefabricated UHPC platform slab in the present utility model.

[0022] Figure 7 is a three-dimensional structural schematic diagram of the prefabricated UHPC tread plate in the present utility model.

[0023] Figure 8 is an enlarged three-dimensional structural schematic diagram of the steel plate welded with vertical steel bars in the present utility model (the vertical steel bars include the second vertical steel bar and the third vertical steel bar, and the steel plates include the first steel plate and the second steel plate).

[0024] As shown in the figure:

[0025] 1. Foundation platform of the building, 11. Transverse steel bars;

[0026] 2. Prefabricated UHPC base, 21. Rectangular bottom frame, 211. Rear side border, 212. Front side border, 22. First column, 221. First vertical steel bar, 222. First horizontal hole, 23. Second column, 231. Fourth vertical steel bar, 232. Second horizontal hole;

[0027] 3. Prefabricated UHPC beam, 31. Prefabricated UHPC left beam, 311. First reserved hole, 312. Left baffle, 32. Right beam, 322. Right baffle, 33. Prefabricated UHPC middle beam, 331. Third reserved hole, 34. Platform surface, 35. Blind hole, 36. Horizontal surface, 37. Vertical surface;

[0028] 4. Prefabricated UHPC plate, 41. Prefabricated UHPC platform plate, 411. First steel plate, 4111. Second vertical steel bar, 42. Prefabricated UHPC tread plate, 421. Second steel plate, 4211. Third vertical steel bar, 422. Vertical plate of L-shaped plate, 423. Horizontal plate of L-shaped plate, 43. UHPC anti-slip strip;

[0029] 5. Handrail, 51. Vertical steel pipe, 52. Horizontal steel pipe, 53. Inclined steel pipe;

[0030] 6. Solidified cement slurry. Specific embodiments

[0031] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted here that the description of these specific embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the following specific embodiments of the present invention can be combined with each other as long as they do not conflict with each other.

[0032] Ultra-high performance concrete, abbreviated as UHPC (Ultra-High Performance Concrete), also known as reactive powder concrete (RPC, Reactive Powder Concrete), is the most innovative cement-based engineering material in the world in recent decades, especially in the past decade or so, achieving a great leap in the performance of engineering materials. Ultra-high performance concrete itself has properties such as ultra-high strength mechanical properties, ultra-high toughness, high density, corrosion resistance, impact resistance and compressive capacity. Ultra-high performance concrete is already a mature technology, and its performance and formula are detailedly recorded in online encyclopedias, and relevant technical standards such as the on-site inspection technical specification for the elastic modulus of structural concrete in CBMF XX-201X have also been published. The present utility model does not improve ultra-high performance concrete itself, but utilizes the existing properties of ultra-high performance concrete such as high toughness, high density and corrosion resistance, and uses precast UHPC pedestals 2, precast UHPC left beams 31, precast UHPC right beams 32, precast UHPC platform plates 41, multiple precast UHPC tread plates 42 and precast UHPC middle beams 33, etc. to assemble and fixedly connect this precast component prefabricated outdoor step. Those skilled in the art can understand that the pouring process of each of the above precast UHPC components belongs to the prior art. For example, using metal or plastic or wood to make inner and outer molds, after mixing ultra-high performance concrete mortar according to the formula of the prior art such as containing UHPC steel fibers inside and technical specifications, pouring or casting from the bottom upwards, and combining with stirring or vibrating tools to integrally pour and form each UHPC component required by the present utility model one by one, or integrally cast and form, and solidify until reaching the quality requirements specified by ultra-high performance concrete.

[0033] The prefabricated component prefabricated outdoor step of the present utility model can be applied to buildings such as for people to go up and down when there is a height difference transition between the foundation platform 1 of a building and the road surface.

[0034] Such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 as shown.

[0035] The prefabricated component prefabricated outdoor step of the present utility model can also be expressed as an outdoor step assembled by prefabricated components.

[0036] The prefabricated component assembled outdoor steps of the utility model include a prefabricated UHPC base 2, a prefabricated UHPC left beam 31, a prefabricated UHPC right beam 32, a prefabricated UHPC platform board 41 and multiple prefabricated UHPC tread boards 42. The prefabricated UHPC left beam 31 and the prefabricated UHPC right beam 32 are symmetrically and fixedly connected to both ends of the prefabricated UHPC base 2. The prefabricated UHPC platform board 41 is fixedly connected to the platform surfaces 34 of the prefabricated UHPC left beam 31 and the prefabricated UHPC right beam 32. Multiple prefabricated UHPC tread boards 42 are fixed on the step surfaces of the prefabricated UHPC left beam 31 and the prefabricated UHPC right beam 32. The fixed connection means a fixed connection, which can also be called an assembled fixation or a fixation. The tread board 42 is also called a kick board.

[0037] The prefabricated UHPC base 2 includes a rectangular bottom frame 21 and two first columns 22 fixed to the rear side frame 211 of the rectangular bottom frame 21. At the top of one first column 22 and at the top of the same end of the front side frame 212 of the rectangular bottom frame 21, there is a first vertical steel bar 212 that is embedded and used to be inserted into a reserved hole such as the first reserved hole 311 in the prefabricated UHPC left beam 31 and is used for grouting to anchor. At the top of the other first column 22 and at the top of the same end of the front side frame 212 of the rectangular bottom frame 21, there is also a first vertical steel bar 221 that is embedded and used to be inserted into a reserved hole such as the second reserved hole in the prefabricated UHPC right beam 32 and is used for grouting to anchor. Grouting means pouring cement slurry.

[0038] The two first columns 22 at the rear are preferably located at both ends of the rear side frame 211 of the rectangular bottom frame 21 of the prefabricated UHPC base 2.

[0039] On the left side of the prefabricated UHPC left beam 31, there is a left baffle 312 to prevent the prefabricated UHPC platform board 41 and multiple prefabricated UHPC tread boards 42 from moving to the left. On the right side of the prefabricated UHPC right beam 32, there is a right baffle 322 to prevent the prefabricated UHPC platform board 41 and multiple prefabricated UHPC tread boards 42 from moving to the right.

[0040] At both ends of the prefabricated UHPC platform board 41, there are multiple, such as two, embedded first steel plates 411, such as rectangular steel plates, for fixing the handrail 5. The bottom end of the first steel plate 411 is fixed, such as welded, with a second vertical steel bar 4111 that is used to be inserted into the corresponding blind holes 35 filled with cement slurry in the prefabricated UHPC left beam 31 and the prefabricated UHPC right beam 32 for anchoring.

[0041] At each end of each precast UHPC tread plate 42, there is a second steel plate 421 embedded and used for fixing the handrail 5. At the bottom end of the second steel plate 421, there is a third vertical steel bar 4211 for inserting and anchoring in the corresponding blind holes 35 filled with cement slurry in the precast UHPC left beam 31 and the precast UHPC right beam 32.

[0042] The precast component assembled outdoor step of the present utility model further includes a handrail 5. The handrail 5 is welded by a plurality of vertical steel pipes 51, a plurality of horizontal steel pipes 52 and a plurality of inclined steel pipes 53. The bottom ends of some of the vertical steel pipes 51 among the plurality of vertical steel pipes 51 are welded and fixed to the first steel plate 411, and the bottom ends of some of the vertical steel pipes 51 are welded and fixed to the second steel plate 421. The connection between the vertical steel pipe 51 and the horizontal steel pipe 52 of the outer frame of the handrail 5 can be an arc transition, the connection between the vertical steel pipe 51 and the inclined steel pipe 53 of the outer frame can also be an arc transition, and the connection between the inclined steel pipe 53 and the horizontal steel pipe 52 of the outer frame can also be an arc transition.

[0043] Figure 8 The steel plates and vertical steel bars in are not marked. It is not difficult to understand that Figure 8 the steel plate in is both the first steel plate 411 and the second steel plate 421; Figure 8 the vertical steel bar in is both the second vertical steel bar 4111 and the third vertical steel bar 4211. The first steel plate 411 can also be called the first steel block. The second steel plate 421 can also be called the second steel block.

[0044] The precast component assembled outdoor step of the present utility model further includes a precast UHPC middle beam 33. The precast UHPC base 2 further includes a second upright column 23 fixed in the middle of the rear side frame 211 of the rectangular bottom frame 21. At the top of the second upright column 23 and the top of the middle of the front side frame 212 of the rectangular bottom frame 21, there is a fourth vertical steel bar 231 embedded and used for inserting into the reserved hole such as the third reserved hole 331 of the precast UHPC middle beam 33 and used for grouting and anchoring. It is not difficult to understand that the rectangular bottom frame 21 includes a front side frame 212, a rear side frame 211, a left end frame, a middle support and a right end frame.

[0045] It is not difficult to understand that in the case where there is a precast UHPC middle beam 33, in the face of different heights, while replacing the precast UHPC left beam 31 and the precast UHPC right beam 32, the precast UHPC middle beam 33 is also replaced to meet the needs of different heights.

[0046] There may be embedded horizontal steel bars 11 on the building foundation platform 1. There are reserved horizontal holes such as the first horizontal hole 222 on both of the two first upright columns 22 for inserting into the embedded horizontal steel bars 11 and then grouting for anchoring. It is not difficult to understand that there may also be reserved horizontal holes such as the second horizontal hole 232 on one second upright column 23 for inserting into the embedded horizontal steel bars 11 and then grouting for anchoring.

[0047] The cross-section of each precast UHPC tread plate 42 is preferably an L-shaped plate. The vertical plate 422 of the L-shaped plate is attached to the vertical surface 37 of the stepped surface of the precast UHPC left beam 31, the precast UHPC right beam 32, and the precast UHPC middle beam 33. The horizontal plate 423 of the L-shaped plate is attached to the horizontal surface 36 of the stepped surface of the precast UHPC left beam 31, the precast UHPC right beam 32, and the precast UHPC middle beam 33. The horizontal surface 36 can also be called the horizontal-facing surface. It is not difficult to understand that the platform surface 34 only has the horizontal surface 36 or the horizontal-facing surface; while the stepped surface has the horizontal surface 36 and the vertical surface 37. The precast UHPC middle beam 33 can also be called the precast UHPC intermediate beam. For the convenience of description, the above-mentioned precast UHPC left beam 31, the precast UHPC right beam 32, and the precast UHPC middle beam 33 are collectively referred to as the precast UHPC beam 3.

[0048] The first reserved hole 311 of the precast UHPC left beam 31, the second reserved hole of the precast UHPC right beam 32, and the third reserved hole 331 of the precast UHPC middle beam 33 can all have such a structure: the hole connected to the first vertical steel bar 221 of the first upright column 22 can be a through hole; the hole connected to the fourth vertical steel bar 231 of the second upright column 23 can be a through hole. The hole connected to the fourth vertical steel bar 231 of the front side frame 212 of the rectangular bottom frame 21 can be a hole with a partition in the middle as shown in Figure 2 the figure, that is, the upper part is a blind hole and the lower part is also a blind hole. Of course, through holes can still be used.

[0049] The upper surfaces of the precast UHPC platform plate 41 and multiple precast UHPC tread plates 42 can be provided with multiple upwardly convex UHPC anti-slip strips 43.

[0050] For the convenience of description, the above-mentioned precast UHPC platform plate 41 and multiple precast UHPC tread plates 42 are collectively referred to as the precast UHPC plate 4.

[0051] The above-mentioned anchoring means solid connection after the cement slurry solidifies. The solidified cement slurry can be labeled as 6, that is, it can be expressed as: the solidified cement slurry 6.

[0052] The components, structures, quantities, etc. that are not labeled above are not shown in the figure, and some components are not labeled in the figure. The drawings are only schematic. If there are inconsistencies between the drawings and the text description or inconsistencies between the drawings themselves, the text description shall prevail.

[0053] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A prefabricated outdoor staircase, characterized in that: The invention comprises a prefabricated UHPC base, a prefabricated UHPC left beam, a prefabricated UHPC right beam, a prefabricated UHPC platform plate and a plurality of prefabricated UHPC footboards. The prefabricated UHPC left beam and the prefabricated UHPC right beam are symmetrically fixedly connected at two ends of the prefabricated UHPC base, the prefabricated UHPC platform plate is fixedly connected to the platform surfaces of the prefabricated UHPC left beam and the prefabricated UHPC right beam, and a plurality of prefabricated UHPC footboards are fixedly connected to the stepped surfaces of the prefabricated UHPC left beam and the prefabricated UHPC right beam.

2. The prefabricated outdoor stair according to claim 1, characterized in that: The prefabricated UHPC base includes a rectangular bottom frame and two first columns fixed to the rear side frame of the rectangular bottom frame, the top of one first column and the top of the same end of the front side frame of the rectangular bottom frame each have a first vertical steel bar pre-embedded and used for inserting into a reserved hole of the prefabricated UHPC left beam and used for grouting for anchoring; the top of the other first column and the top of the same end of the front side frame of the rectangular bottom frame each have a first vertical steel bar pre-embedded and used for inserting into a reserved hole of the prefabricated UHPC right beam and used for grouting for anchoring.

3. The prefabricated outdoor stair according to claim 2, characterized in that: There are pre-buried transverse steel bars on the foundation platform of the building, and there are reserved transverse holes on the two first columns for inserting the pre-buried transverse steel bars and then grouting for anchoring.

4. The prefabricated outdoor stair according to claim 2, characterized in that: The two first columns on the rear side are located at both ends of the rear side frame of the prefabricated UHPC base rectangular bottom frame.

5. The prefabricated outdoor stair according to claim 1, characterized in that: The cross section of each prefabricated UHPC tread plate is an L-shaped plate, the vertical plate of the L-shaped plate is in contact with the vertical surface of the stepped surface of the prefabricated UHPC left beam and the prefabricated UHPC right beam, and the horizontal plate of the L-shaped plate is in contact with the horizontal surface of the stepped surface of the prefabricated UHPC left beam and the prefabricated UHPC right beam.

6. The prefabricated outdoor stair according to claim 1, characterized in that: The left side of the prefabricated UHPC left beam is provided with a left baffle plate for preventing the prefabricated UHPC platform plate and a plurality of prefabricated UHPC footboards from moving leftward, and the right side of the prefabricated UHPC right beam is provided with a right baffle plate for preventing the prefabricated UHPC platform plate and a plurality of prefabricated UHPC footboards from moving rightward.

7. The prefabricated outdoor stair according to claim 1, characterized in that: There are multiple pre-embedded first steel plates for fixing handrails at both ends of the prefabricated UHPC platform plate. The bottom end of the first steel plate is fixed with a second vertical steel bar for inserting into the corresponding blind holes filled with cement slurry of the prefabricated UHPC left beam and the prefabricated UHPC right beam for anchoring.

8. The prefabricated outdoor stair according to claim 7, characterized in that: Each of the two ends of each prefabricated UHPC tread plate is provided with a pre-embedded second steel plate for fixing the handrail, and the bottom end of the second steel plate is fixed with a third vertical steel bar for insertion into the corresponding blind holes filled with cement slurry of the prefabricated UHPC left beam and the prefabricated UHPC right beam for anchoring.

9. The prefabricated outdoor stair according to claim 8, characterized in that: It also includes handrails, which are welded by multiple vertical steel pipes, multiple horizontal steel pipes and multiple inclined steel pipes. The bottom ends of some of the multiple vertical steel pipes are welded and fixed to the first steel plate, and the bottom ends of some of the vertical steel pipes are welded and fixed to the second steel plate.

10. The prefabricated outdoor stair according to claim 4, characterized in that: It also includes a prefabricated UHPC middle beam; the prefabricated UHPC base also includes a second column fixed in the middle of the rear side frame of the rectangular bottom frame, and the top of the second column and the top of the middle of the front side frame of the rectangular bottom frame are each provided with a fourth vertical steel bar which is pre-embedded and used for inserting into the reserved hole of the prefabricated UHPC middle beam and for grouting for anchoring.

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