Fabricated lightweight stair

Abstract

The utility model discloses an assembled light stair, including the assembled light stair body of installing in the top of upper ladder beam and lower ladder beam, the assembled light stair body includes: the outer ladder section, it is two groups, and the inner ladder section has the activity contact between two outer ladder sections. The utility model discloses through setting up a series of structures, can directly factory prefabricate two outer ladder sections and inner ladder section and carry out on -the -spot assembling and fixing, need not on -the -spot separately build the formwork and fixed frame of inner ladder section in the middle and carry out the pouring work, and the convenient splicing group solid work of directly on -the -spot pouring is avoided, improves use convenience and assembly efficiency, in addition through the mode of the light stair into two outer ladder sections and inner ladder section three parts, reduce the self weight of single stair component, and the tower crane tonnage is reduced greatly on -the -spot, saves the cost, and through the mode of direct assembly of on -the -spot pouring, facilitates the subsequent demolition reconstruction work, improves use flexibility.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building technology, specifically a prefabricated lightweight staircase. Background Technology

[0002] Traditional prefabricated staircases have their stair sections prefabricated as a whole. To ensure strength, a sufficient quantity and quality of steel bars are required. Therefore, the existing monolithic technology results in a large amount of steel bars used in the stair sections, and the stair sections are also heavy. Large-tonnage tower cranes are required on site. Both production and construction costs are relatively high.

[0003] Existing designs (e.g., publication number CN220889237U) disclose a prefabricated lightweight staircase, comprising a first and second stair section arranged side-by-side. The first stair section includes a first reinforced concrete main body and a first horizontal reinforcing bar, and the second stair section includes a second reinforced concrete main body and a second horizontal reinforcing bar. The area between the first and second reinforced concrete main bodies is a post-cast area. The prefabricated lightweight staircase also includes a third stair section formed by pouring concrete into the post-cast area. Compared with the prior art, it includes a first and second stair section made of fiber reinforced concrete material. The reinforcing bars of the first and second stair sections extend outwards with a certain length reserved at both ends, and the middle reinforcing bars are staggered and ensure a certain lap length. UHPC is poured to form the third stair section, so that the first and second stair sections are connected to form a whole. The stair section adopts a split structure, reducing the self-weight of individual stair components, significantly reducing the tonnage of the tower crane on site, and saving costs.

[0004] The aforementioned technology discloses a prefabricated lightweight staircase, which involves prefabricating the first and second stair sections separately in a factory, assembling them on-site, and then casting a third stair section between them to form the entire lightweight staircase. This segmented hoisting reduces the self-weight of individual staircase components, significantly reducing the tonnage of the on-site tower crane and saving costs. However, this method has the following drawbacks:

[0005] 1. After the first and second stair sections are installed and fixed, a formwork needs to be erected on-site for pouring to form the third stair section. The on-site pouring method requires disassembling and assembling the formwork and installing C-shaped clamps at multiple points for fixing, which is cumbersome and cannot be easily assembled on-site without pouring. The convenience of use is not ideal and the assembly efficiency is low. 2. The method of connecting the third stair section by pouring it on-site also makes subsequent demolition and modification difficult. Improvements are needed. Therefore, a prefabricated lightweight staircase is proposed to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a prefabricated lightweight staircase to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a prefabricated lightweight staircase, comprising a prefabricated lightweight staircase body installed on the top of the upper and lower stair beams, wherein the prefabricated lightweight staircase body includes:

[0008] The outer stair section consists of two sets, with an inner stair section in movable contact between the two outer stair sections. Multiple horizontal steel bars are pre-embedded in the outer stair sections. The opposing ends of two front and rear opposing horizontal steel bars extend to the outside of their respective outer stair sections and are configured as the first external thread. Multiple stainless steel sleeves are pre-embedded in the inner stair section. The adjacent ends of two front and rear opposing horizontal steel bars are movably inserted into the corresponding stainless steel sleeves. The multiple horizontal steel bars are used to insert into the corresponding stainless steel sleeves when the two outer stair sections are spliced ​​with the inner stair section. The interlocking of the multiple horizontal steel bars and the stainless steel sleeves realizes the positioning support and reinforcement connection of the inner stair section.

[0009] The ribs are in two sets. The sides of the two ribs that are close to each other are in movable contact with the sides of the two outer trapezoidal sections that are opposite to each other. The ribs are movably sleeved on the corresponding multiple horizontal reinforcing bars. The first external thread of the horizontal reinforcing bar is threaded with a locking nut that is in tight contact with the outer side of the corresponding rib. The locking nut is used to lock the rib after it is sleeved on the corresponding multiple horizontal reinforcing bars by tightening it on the first external thread of the corresponding horizontal reinforcing bar with a wrench, thereby realizing the fixed connection between the rib and the outer trapezoidal section.

[0010] Positioning components, which consist of multiple sets, are installed at the bottom of the outer and inner stair sections;

[0011] The tension fastening assembly consists of multiple sets connected between two ribs and movably fitted within three corresponding positioning assemblies. The tension fastening assembly is used to tension and lock the two ribs and to reinforce the bottom of the outer and inner stair sections through the three corresponding positioning assemblies.

[0012] Preferably, the positioning component includes a positioning sleeve, a connecting seat is welded and fixed to the top of the positioning sleeve, and two T-shaped fasteners are welded and fixed to the top of the connecting seat, with multiple T-shaped fasteners pre-embedded in the outer and inner stair sections respectively.

[0013] Preferably, the tension fastening assembly includes an internal threaded sleeve, the outer side of which is hexagonal, and the rear side of the internal threaded sleeve is integrally provided with an enlarged portion that movably contacts the rear side of the rear rib plate. The rear side of the rear rib plate is provided with a plurality of hexagonal holes at equal intervals, and the internal threaded sleeve is connected to the corresponding hexagonal holes.

[0014] The front side of the rib plate located on the front side has multiple circular through holes at equal intervals. A pull rod is movably inserted into the circular through holes. The front end of the pull rod is integrally provided with an internal hexagonal operating part that movably contacts the front side of the front rib plate. The rear end of the pull rod passes through three corresponding positioning sleeves in sequence and is integrally provided with a second external thread. The second external thread is screwed into the corresponding internal thread sleeve. Multiple pull rods are provided one every other stair step.

[0015] Preferably, the internal threaded sleeve is bonded and fixed to the corresponding hexagonal hole by strong adhesive.

[0016] Preferably, the internal threaded sleeve is movably connected to the corresponding hexagonal hole, and the outer side of the internal threaded sleeve is in movable contact with the inner wall of the corresponding hexagonal hole; by using the method of movably connecting the internal threaded sleeve, it is convenient to pull out and recycle the internal threaded sleeve during subsequent modification and disassembly.

[0017] Preferably, three equally spaced first longitudinal steel bars are pre-embedded in both the outer and inner ladder sections. The first longitudinal steel bars are stepped and match the shape of the outer and inner ladder sections. The first longitudinal steel bars in the outer ladder section are welded and fixed to the corresponding multiple horizontal steel bars.

[0018] Preferably, the rib plate is pre-embedded with a second longitudinal steel bar and a lower steel bar. The second longitudinal steel bar is stepped in shape to match the shape of the outer and inner trapezoidal segments, and the top of the rib plate is stepped in shape to match the shape of the outer and inner trapezoidal segments.

[0019] Preferably, two countersunk holes for installing external fixing bolts are provided on the top right and top left sides of the outer ladder section, and four stainless steel nuts are pre-embedded and fixed on the top of the upper and lower ladder beams, with the stainless steel nuts vertically aligned with the corresponding countersunk holes.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. By using the set outer ladder section, inner ladder section, rib plate, horizontal steel bar, locking nut, stainless steel sleeve, positioning component and tension fastening component, two outer ladder sections and inner ladder sections can be prefabricated in the factory and assembled and fixed on site. There is no need to build a separate template and fixing frame for the middle inner ladder section on site for pouring. It is convenient to directly splice and fix on site without pouring, which improves the ease of use and assembly efficiency.

[0022] 2. By dividing the lightweight staircase into three parts—two outer stair sections and an inner stair section—the self-weight of each individual staircase component is reduced, significantly decreasing the tonnage of the tower crane on site and saving costs.

[0023] 3. By assembling directly on-site without pouring, the inability to disassemble later is avoided, which facilitates subsequent demolition and modification work and improves the flexibility of use.

[0024] This utility model, through a series of structures, enables the direct prefabrication of two outer stair sections and an inner stair section in the factory and their on-site assembly and fixing. It eliminates the need for separate on-site formwork and support for the inner stair section, allowing for convenient on-site splicing and assembly without the need for pouring. This improves ease of use and assembly efficiency. Furthermore, by dividing the lightweight staircase into three parts (two outer stair sections and an inner stair section), the self-weight of each individual staircase component is reduced, significantly lowering the on-site tower crane tonnage and saving costs. The on-site, pour-free assembly method also facilitates subsequent dismantling and modification work, increasing flexibility in use. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of a prefabricated lightweight staircase proposed in this utility model;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure viewed from below;

[0027] Figure 3 This is a schematic diagram of the unassembled outer and inner stair sections of a prefabricated lightweight staircase proposed in this utility model.

[0028] Figure 4 This is a schematic diagram of the external stair section structure of a prefabricated lightweight staircase proposed in this utility model;

[0029] Figure 5 This is a cross-sectional view of the rear rib plate in a prefabricated lightweight staircase proposed in this utility model.

[0030] Figure 6 A schematic diagram of the connection structure of the positioning component and the tensioning fastening component of the prefabricated lightweight staircase proposed in this utility model;

[0031] Figure 7 This is a schematic diagram of the unassembled state of the positioning component and the tension fastening component of the prefabricated lightweight staircase proposed in this utility model.

[0032] In the diagram: 100, upper ladder beam; 200, lower ladder beam; 1, outer ladder section; 11, horizontal reinforcement; 12, countersunk hole; 13, first longitudinal reinforcement; 2, inner ladder section; 21, stainless steel sleeve; 3, rib plate; 31, locking nut; 32, second longitudinal reinforcement; 33, lower reinforcement; 34, hexagonal hole; 4, positioning sleeve; 41, connecting seat; 42, T-shaped fastener; 5, internal threaded sleeve; 51, expansion section; 52, tie rod; 53, internal hexagonal operating section; 54, second external threaded section. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1

[0035] like Figures 1 to 7 As shown, this embodiment proposes a prefabricated lightweight staircase, including a prefabricated lightweight staircase body installed on the top of the upper stair beam 100 and the lower stair beam 200. The prefabricated lightweight staircase body includes:

[0036] The outer stair section 1 consists of two sets, with an inner stair section 2 in contact between them. Multiple horizontal steel bars 11 are embedded in the outer stair section 1. The opposing ends of two horizontal steel bars 11 extend to the outside of the corresponding outer stair section 1 and are set as the first external thread. Multiple stainless steel sleeves 21 are embedded in the inner stair section 2. The adjacent ends of two horizontal steel bars 11 are movably inserted into the corresponding stainless steel sleeves 21. The multiple horizontal steel bars 11 are used to insert into the corresponding stainless steel sleeves 21 when the two outer stair sections 1 and the inner stair section 2 are spliced. The interlocking of the multiple horizontal steel bars 11 and the stainless steel sleeves 21 realizes the positioning support and reinforcement connection of the inner stair section 2.

[0037] Ribs 3 are in two sets. The sides of the two ribs 3 that are close to each other are in movable contact with the sides of the two outer trapezoidal sections 1 that are opposite to each other. Ribs 3 are movably sleeved on the corresponding multiple horizontal steel bars 11. The first external thread of the horizontal steel bar 11 is threaded with a locking nut 31 that is in tight contact with the outer side of the corresponding rib 3. The locking nut 31 is used to lock the rib 3 when it is tightened on the first external thread of the corresponding horizontal steel bar 11 after the rib 3 is sleeved on the corresponding multiple horizontal steel bars 11 by a wrench, so as to realize the fixed connection between the rib 3 and the outer trapezoidal section 1.

[0038] Positioning components, which consist of multiple sets, are installed at the bottom of the outer stair section 1 and the inner stair section 2;

[0039] The tension fastening assembly consists of multiple sets, connected between the two ribs 3, and movably fitted within the corresponding three positioning assemblies; the tension fastening assembly is used to tension and lock the two ribs 3, and to reinforce the bottom support of the outer stair section 1 and the inner stair section 2 through the corresponding three positioning assemblies.

[0040] In this embodiment, three equally spaced first longitudinal steel bars 13 are pre-embedded in both the outer stair section 1 and the inner stair section 2. The first longitudinal steel bars 13 are stepped in shape to match the shape of the outer stair section 1 and the inner stair section 2. The first longitudinal steel bars 13 located in the outer stair section 1 are welded and fixed to the corresponding multiple horizontal steel bars 11. The first longitudinal steel bars 13 are arranged along the longitudinal direction of the outer stair section 1 or the inner stair section 2, and are arranged in conjunction with the transverse direction of the horizontal steel bars 11. This structure helps to improve the strength of the stair section.

[0041] The rib plate 3 is pre-embedded with a second longitudinal steel bar 32 and a lower steel bar 33. The second longitudinal steel bar 32 is stepped in shape to match the shape of the outer trapezoid 1 and the inner trapezoid 2. The top of the rib plate 3 is stepped in shape to match the shape of the outer trapezoid 1 and the inner trapezoid 2. The second longitudinal steel bar 32 and the lower steel bar 33 are used to strengthen the strength of the rib plate 3.

[0042] Two countersunk holes 12 for installing external fixing bolts are provided on the top right and top left of the outer stair section 1. Four stainless steel nuts are pre-embedded and fixed on the top of the upper stair beam 100 and the lower stair beam 200. The stainless steel nuts are vertically aligned with the corresponding countersunk holes 12. The countersunk holes 12 are provided for personnel to insert the external fixing bolts and tighten them with the stainless steel nuts after assembly, so as to fix the outer stair section 1 to the top of the upper stair beam 100 and the lower stair beam 200. The upper stair beam 100 and the lower stair beam 200 support the outer stair section 1 and the inner stair section 2 at the bottom.

[0043] The method for the rib plate 3 to be sleeved on the corresponding multiple horizontal reinforcing bars 11 is as follows: when processing the rib plate 3, multiple through holes are reserved for the horizontal reinforcing bars 11 to pass through, and the rib plate 3 is sleeved on the outside of the multiple horizontal reinforcing bars 11 through the corresponding multiple through holes.

[0044] It should be noted that both the locking nut 31 and the stainless steel sleeve 21 are made of stainless steel. The thread clearance between the locking nut 31 and the first external thread is 0.25-0.35mm, which is a high wear-resistant and load-bearing specification. The high hardness and wear resistance of stainless steel, combined with the wide thread clearance and high wear-resistant and load-bearing specification design, ensures long-term connection stability. In addition, when installing the locking nut 31, the operator can first place an anti-slip washer on the outside of the first external thread before operating and locking the locking nut 31 to better ensure stable locking. The use of threaded locking fasteners with anti-slip washer is a conventional and well-known technology, and will not be described in detail here.

[0045] Furthermore, such as Figure 2 , 6 As shown in Figure 7, the positioning assembly includes a positioning sleeve 4, a connecting seat 41 is welded and fixed to the top of the positioning sleeve 4, and two T-shaped fasteners 42 are welded and fixed to the top of the connecting seat 41. Multiple T-shaped fasteners 42 are pre-embedded in the outer ladder section 1 and the inner ladder section 2 respectively.

[0046] In this embodiment, the T-shaped buckle 42, the connecting seat 41 and the positioning sleeve 4 cooperate to pre-embed the T-shaped buckle 42 in the concrete during the pouring of the outer stair section 1 or the inner stair section 2 in the factory. When the concrete solidifies to form the outer stair section 1 or the inner stair section 2, the T-shaped buckle 42 is fixed to the concrete to form an integral whole.

[0047] Furthermore, such as Figure 2 , 6 As shown in Figure 7, the tension fastening assembly includes an internal threaded sleeve 5. The outer side of the internal threaded sleeve 5 is hexagonal. An enlarged portion 51 is integrally provided on the rear side of the internal threaded sleeve 5, which is in movable contact with the rear side of the rear rib plate 3. Multiple hexagonal holes 34 are equally spaced on the rear side of the rear rib plate 3, and the internal threaded sleeve 5 is connected in the corresponding hexagonal holes 34.

[0048] Multiple circular through holes are evenly spaced on the front side of the rib plate 3 located on the front side. A pull rod 52 is movably inserted into the circular through holes. The front end of the pull rod 52 is integrally provided with an internal hexagonal operating part 53 that movably contacts the front side of the rib plate 3. The rear end of the pull rod 52 passes through three corresponding positioning sleeves 4 in sequence and is integrally provided with a second external thread part 54. The second external thread part 54 is threaded into the corresponding internal thread sleeve 5. Multiple pull rods 52 are provided one every other stair step.

[0049] In this embodiment, the internal threaded sleeve 5, hexagonal hole 34, expansion part 51, round through hole, pull rod 52, second external thread part 54, and internal hexagonal operating part 53 cooperate to insert the internal threaded sleeve 5 from back to front into the corresponding hexagonal hole 34. The hexagonal shape of the outer side of the internal threaded sleeve 5 achieves a tight fit with the corresponding hexagonal hole 34 to prevent rotation. The pull rod 52 is inserted from front to back through the corresponding round through hole and then passes through the three corresponding positioning sleeves 4 in sequence, causing the second external thread part 54 to abut against the inner side of the internal threaded sleeve 5. The internal hexagonal operating part 53 is rotated by an external hexagonal wrench to drive the pull rod. 52 rotates, and the pull rod 52 drives the corresponding second external thread part 54 to gradually tighten into the internal thread sleeve 5 until the internal hexagonal operating part 53 abuts against the front side of the front rib plate 3. The pull rod 52, internal hexagonal operating part 53 and internal thread sleeve 5 are used to pull and lock the two rib plates 3, and then the two rib plates 3 are used to clamp and connect the two outer ladder sections 1 and the inner ladder section 2 into one piece, completing the assembly. In addition, the pull rod 52 is used to reinforce the bottom of the outer ladder section 1 and the inner ladder section 2 through the corresponding three positioning sleeves 4 and three connecting seats 41 in sequence, further enhancing the connection stability of the outer ladder section 1 and the inner ladder section 2.

[0050] It should be noted that both the internal threaded sleeve 5 and the pull rod 52 are made of stainless steel. The high hardness and wear resistance of stainless steel ensure long-term connection stability. In addition, when inserting the pull rod 52, an anti-slip pad can be placed on its outer side before insertion and tightening. When tightening, the internal hexagonal operating part 53 at the end of the pull rod 52 is used to press the anti-slip pad to prevent slippage. The use of threaded fasteners in conjunction with the anti-slip pad is a conventional and well-known technology, which will not be described in detail here.

[0051] Furthermore, the internal threaded sleeve 5 is bonded and fixed to the corresponding hexagonal hole 34 with strong adhesive. By using strong adhesive to bond and fix the internal threaded sleeve 5, the internal threaded sleeve 5 can be prevented from being accidentally knocked off when it is inserted into the traction rod 52 without the need for personnel to assist and support it.

[0052] According to a specific embodiment of this utility model, the thickness of the outer stair section 1 and the inner stair section 2 is 50-70mm; the thickness of the rib plate 3 is 40-60mm.

[0053] This embodiment allows for the direct prefabrication of two outer stair sections 1 and inner stair section 2 in the factory and their on-site assembly and fixation. This facilitates convenient on-site splicing and assembly without the need for pouring, improving ease of use and assembly efficiency. Furthermore, by dividing the lightweight staircase into three parts—two outer stair sections 1 and inner stair section 2—the self-weight of each staircase component is reduced, significantly lowering the on-site tower crane tonnage and saving costs. Moreover, the on-site assembly without pouring facilitates subsequent dismantling and modification work, increasing the flexibility of use.

[0054] The usage method of this embodiment is as follows: When using this prefabricated lightweight staircase, two outer stair sections 1 and inner stair sections 2 are prefabricated directly in the factory. The T-shaped fastener 42 is pre-embedded in the poured concrete when the outer stair section 1 or inner stair section 2 is prefabricated in the factory. When the outer stair section 1 or inner stair section 2 is solidified and formed, it is fixed to the T-shaped fastener 42 to form an integral whole. When transported to the site for assembly, after the two outer stair sections 1 and inner stair sections 2 are hoisted onto the upper stair beam 100 and the lower stair beam 200 respectively, the two rib plates 3 are respectively passed through the corresponding multiple reserved round holes and sleeved on the outside of multiple horizontal steel bars 11. Personnel can first put an anti-slip pad on the outside of the first external thread at the end of the horizontal steel bar 11, and then tighten the locking nut 31 on the corresponding first external thread with a wrench to lock the rib plate 3, thereby realizing the fixed connection between the rib plate 3 and the outer stair section 1.

[0055] Then, the two outer stair sections 1 are moved closer to the inner stair section 2. The outer stair section 1 drives the corresponding multiple horizontal steel bars 11 to be inserted into the multiple stainless steel sleeves 21 on the inner stair section 2. The interlocking of the multiple horizontal steel bars 11 and the stainless steel sleeves 21 achieves positioning support and reinforcement connection of the inner stair section 2. Then, the inner threaded sleeve 5 is inserted from back to front into the corresponding hexagonal hole 34 and fixed with strong glue. The hexagonal shape of the outer side of the inner threaded sleeve 5 is used to fit and lock with the corresponding hexagonal hole 34 to prevent rotation. The pull rod 52 is inserted from front to back through the corresponding round through hole and then through the three corresponding positioning sleeves 4 in sequence. The second external thread 54 is driven to abut against the inner side of the inner threaded sleeve 5. The internal hexagonal operating part 53 is rotated by the external hexagonal wrench to drive the pull rod 52 to rotate. The pull rod 52 drives the corresponding second external thread 54 to gradually tighten into the inner threaded sleeve 5 until the internal hexagonal operating part 53 is in contact with the front rib. The front side of plate 3 is pressed together, and the two rib plates 3 are pulled and locked using the tie rod 52, the internal hexagonal operating part 53 and the internal threaded sleeve 5. Then, the two rib plates 3 are used to clamp and connect the two outer stair sections 1 and the inner stair section 2 to form a whole, completing the assembly. In addition, the tie rod 52 is used to reinforce the bottom of the outer stair section 1 and the inner stair section 2 through the corresponding three positioning sleeves 4 and three connecting seats 41 in sequence, further enhancing the connection stability of the outer stair section 1 and the inner stair section 2. This achieves the effect of directly prefabricating the two outer stair sections 1 and the inner stair section 2 in the factory and assembling and fixing them on site. There is no need to build a separate template and fixing frame for the middle inner stair section 2 on site for pouring work. This facilitates convenient splicing and fixing work on site without pouring, improving the convenience of use and assembly efficiency. In addition, by dividing the lightweight staircase into three parts, namely the two outer stair sections 1 and the inner stair section 2, the self-weight of the individual staircase components is reduced, the tonnage of the tower crane on site is significantly reduced, and costs are saved.

[0056] In addition, after assembly, personnel can fix the outer ladder section 1 to the upper ladder beam 100 or the lower ladder beam 200 by passing the end of the external fixing bolt through the corresponding countersunk hole 12 and tightening it with the stainless steel nut pre-embedded on the upper ladder beam 100 or the lower ladder beam 200. In addition, by using strong glue to bond and fix the internal thread sleeve 5, the internal thread sleeve 5 can be prevented from being accidentally knocked off when it is inserted into the traction rod 52 without the need for personnel to assist and support it.

[0057] When subsequent disassembly and modification are required, first use a wrench to loosen and remove the external fixing bolts used to fix the outer ladder section 1 to the upper ladder beam 100 or the lower ladder beam 200. Then, use a hex wrench to rotate the internal hexagonal operating part 53 in the opposite direction so that it drives the second external thread part 54 and the internal thread sleeve 5 to separate through the pull rod 52. Then, the two outer ladder sections 1 can be moved in the opposite direction, so that they respectively drive the corresponding multiple horizontal steel bars 11 to separate from the inner ladder section 2, thus realizing disassembly. The on-site direct assembly without pouring facilitates subsequent disassembly and modification work and improves the flexibility of use.

[0058] Example 2

[0059] Reference Figure 2 and 5 As shown, this embodiment differs from Embodiment 1 in that the internal threaded sleeve 5 is movably connected to the corresponding hexagonal hole 34, and the outer side of the internal threaded sleeve 5 is in movable contact with the inner wall of the corresponding hexagonal hole 34.

[0060] In this embodiment, the internal threaded sleeve 5 can be easily pulled out and reused during subsequent modification and disassembly.

[0061] The usage method of this embodiment is as follows: The difference from the first embodiment is that it also has the following functions: In addition, by using the movable sleeve connection of the internal threaded sleeve 5, it is convenient to pull out the internal threaded sleeve 5 for recycling during subsequent modification and disassembly. Through the two application methods of the internal threaded sleeve 5, it is convenient for personnel to flexibly select the application according to their needs.

[0062] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A prefabricated lightweight staircase, comprising a prefabricated lightweight staircase body installed on top of an upper stair beam (100) and a lower stair beam (200), characterized in that: The prefabricated lightweight staircase body includes: The outer ladder section (1) consists of two sets, with an inner ladder section (2) in contact between the two outer ladder sections (1). Multiple horizontal steel bars (11) are embedded in the outer ladder section (1). The opposing ends of two horizontal steel bars (11) extend to the outside of the corresponding outer ladder section (1) and are set as the first external thread. Multiple stainless steel sleeves (21) are embedded in the inner ladder section (2). The adjacent ends of two horizontal steel bars (11) are movably inserted into the corresponding stainless steel sleeves (21). The ribs (3) are in two sets. The sides of the two ribs (3) that are close to each other are in active contact with the sides of the two outer ladder sections (1) that are in repulsive to each other. The ribs (3) are movably sleeved on the corresponding multiple horizontal steel bars (11). The first external thread of the horizontal steel bar (11) is threaded with a locking nut (31) that is in tight contact with the outside of the corresponding rib (3). Positioning components, which are in multiple sets, are installed at the bottom of the outer stair section (1) and the inner stair section (2); The tension fastening assembly consists of multiple sets, connected between two ribs (3), and movably fitted within the corresponding three positioning assemblies.

2. The prefabricated lightweight staircase according to claim 1, characterized in that: The positioning component includes a positioning sleeve (4), and a connecting seat (41) is welded and fixed to the top of the positioning sleeve (4). Two T-shaped buckles (42) are welded and fixed to the top of the connecting seat (41). Multiple T-shaped buckles (42) are pre-embedded in the outer ladder section (1) and the inner ladder section (2) respectively.

3. The prefabricated lightweight staircase according to claim 2, characterized in that: The tension fastening assembly includes an internal threaded sleeve (5), the outer side of which is hexagonal, and the rear side of the internal threaded sleeve (5) is integrally provided with an enlarged portion (51) that movably contacts the rear side of the rear rib (3). The rear side of the rear rib (3) is provided with a plurality of hexagonal holes (34) at equal intervals, and the internal threaded sleeve (5) is connected in the corresponding hexagonal holes (34). The front side of the rib plate (3) located on the front side is provided with multiple circular through holes at equal intervals. A pull rod (52) is movably inserted in the circular through holes. The front end of the pull rod (52) is integrally provided with an internal hexagonal operating part (53) that movably contacts the front side of the rib plate (3). The rear end of the pull rod (52) passes through three corresponding positioning sleeves (4) in sequence and is integrally provided with a second external thread part (54). The second external thread part (54) is threaded into the corresponding internal thread sleeve (5). Multiple pull rods (52) are provided one every other stair step.

4. The prefabricated lightweight staircase according to claim 3, characterized in that: The internal threaded sleeve (5) is bonded to the corresponding hexagonal hole (34) by strong adhesive.

5. A prefabricated lightweight staircase according to claim 3, characterized in that: The internal threaded sleeve (5) is movably connected to the corresponding hexagonal hole (34), and the outer side of the internal threaded sleeve (5) is in movable contact with the inner wall of the corresponding hexagonal hole (34).

6. A prefabricated lightweight staircase according to claim 1, characterized in that: The outer ladder section (1) and the inner ladder section (2) are each pre-embedded with three first longitudinal steel bars (13) arranged at equal intervals. The first longitudinal steel bars (13) are stepped in shape matching the shape of the outer ladder section (1) and the inner ladder section (2). The first longitudinal steel bars (13) located in the outer ladder section (1) are welded and fixed to the corresponding multiple horizontal steel bars (11).

7. A prefabricated lightweight staircase according to claim 1, characterized in that: The rib (3) is pre-embedded with a second longitudinal steel bar (32) and a lower steel bar (33). The second longitudinal steel bar (32) is a stepped shape that matches the shape of the outer trapezoid (1) and the inner trapezoid (2). The top of the rib (3) is a stepped shape that matches the shape of the outer trapezoid (1) and the inner trapezoid (2).

8. A prefabricated lightweight staircase according to claim 1, characterized in that: The outer ladder section (1) has two countersunk holes (12) on the top right and top left sides for installing external fixing bolts. The top of the upper ladder beam (100) and the lower ladder beam (200) are pre-embedded with four stainless steel nuts, which are vertically aligned with the corresponding countersunk holes (12).

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