An assembled handrail structure for old community stair transformation

Abstract

The application relates to the technical field of building reconstruction, in particular to an assembly type handrail structure for old community stair reconstruction, which comprises an old handrail vertical rod and a new handrail vertical rod, the old handrail vertical rod is a hollow pipe and is provided with a plug-in hole in the axial direction, the bottom of the new handrail vertical rod is provided with a socket part which is plugged into the plug-in hole, the outer wall of the socket part is fixedly connected with the inner wall of the plug-in hole to form an annular gap, the old handrail vertical rod and the new handrail vertical rod form an integral whole, the re-drilling process is reduced, the construction period is effectively shortened, the assembly type handrail structure is suitable for old community reconstruction projects which are limited by funds and space, and the application has the characteristics of realizing quick and safe handrail replacement.

Description

Technical Field

[0001] This application relates to the field of building renovation technology, and in particular to a prefabricated handrail structure for the renovation of staircases in old residential communities. Background Technology

[0002] Since older residential communities often lack elevators, staircases serve as the main passageways for residents' daily passages and are used frequently. Therefore, replacing staircase handrails is a common and important part of the renovation projects for older residential communities.

[0003] In related technologies, the staircases in old residential areas have complex structures, limited construction space, and are difficult to renovate. Traditional handrail renovations usually require the complete removal of the old handrails before installing new ones, or the temporary reinforcement of the old handrails before removal. The former has strong stability, while the latter reduces safety issues during removal by setting up temporary supports around the old handrails.

[0004] The existing methods for replacing handrails have the following problems: there is a risk of people falling during the period between the complete removal of the old handrails and the installation of the new handrails; in addition, the installation and removal of temporary supports increases the complexity of construction and may affect residents' passage. Therefore, there is an urgent need for a technical solution that can quickly and safely replace handrails. Summary of the Invention

[0005] To facilitate the quick and safe replacement of handrails, this application provides a prefabricated handrail structure for the renovation of staircases in old residential communities.

[0006] The technical solution provided in this application for a prefabricated handrail structure for the renovation of staircases in old residential communities is as follows: A prefabricated handrail structure for the renovation of staircases in old residential communities includes old handrail verticals and new handrail verticals. The old handrail verticals are hollow tubes with insertion holes along the axial direction. The bottom of the new handrail verticals is provided with a socket that engages with the insertion holes. The outer wall of the socket is fixedly connected to the inner wall of the insertion holes to form an annular gap.

[0007] By adopting the above solution, it is not necessary to completely demolish the original structure, reducing the need for re-drilling and effectively shortening the construction period. At the same time, it takes into account both renovation efficiency and structural safety, making it suitable for renovation projects of old residential areas with limited funds and space.

[0008] Preferably, the insertion hole is formed by cutting and trimming the old handrail vertical bar along the step surface.

[0009] By adopting the above solution, material and labor costs are saved, and the cross-section forms a natural stop, thus maximizing the axial load transfer efficiency of the new and old handrail vertical bars.

[0010] Preferably, the interface between the socket and the insertion hole is fully welded.

[0011] By adopting the above solution, the weld seam is continuously filled with the contact surface, which improves the compressive and tensile strength, ensures that the handrail is firm and reliable under vibration or load, and reduces internal corrosion caused by dust and moisture intrusion.

[0012] Preferably, the inner wall of the new handrail vertical bar is provided with a grouting hole and an overflow hole, the overflow hole is located directly above the grouting hole, and the grouting hole and the overflow hole are connected through the internal cavity of the new handrail vertical bar.

[0013] By adopting the above scheme, when grout is injected into the injection hole, the air inside the cavity naturally escapes from the overflow hole above. When the grout overflows from the overflow hole, it indicates that the gap has been completely filled, forming a visual sign of construction completion. The high-position design of the overflow hole can intercept excess grout that has not solidified, allowing it to flow back to the injection hole area through the inner cavity of the rod, reducing material waste and simplifying subsequent cleaning. Preferably, cement mortar can be injected through the grouting hole to fill the annular gap, so that the old handrail vertical bar and the new handrail vertical bar form a whole.

[0014] By adopting the above scheme, cement mortar is injected into the annular gap under high pressure through the grouting hole to form a continuous curing layer, which bonds the steel-mortar interface between the old and new handrail verticals, transforming the original separated components into a composite load-bearing body, improving the overall resistance to lateral displacement. The cured mortar layer acts as a stress buffer medium, which can evenly transmit the vibration load borne by the old handrail verticals to the new handrail verticals, reducing local stress concentration.

[0015] Preferably, epoxy resin adhesive can be injected through the grouting hole to fill the annular gap, so that the old handrail vertical bar and the new handrail vertical bar form a whole.

[0016] By adopting the above scheme, after the epoxy resin adhesive penetrates into the annular gap through the grouting hole, its polar molecules form chemical bonds with the metal surfaces of the new and old vertical bars, effectively improving the bonding strength. After the epoxy resin adhesive cures, it shrinks in volume, reducing the risk of interface peeling caused by the drying shrinkage of traditional cement-based materials, making it suitable for deformation compensation of old railings.

[0017] Preferably, the outer wall of the socket is provided with a limiting ring, and the radial dimension of the limiting ring is larger than the inner diameter of the insertion hole.

[0018] By adopting the above solution, the limiting ring forms a mechanical stop structure, ensuring that the new handrail vertical bar automatically stops at the preset depth when inserted into the old handrail vertical bar, reducing manual measurement errors and improving construction efficiency.

[0019] Preferably, the limiting ring has a through hole on its annular surface that communicates with the grouting hole.

[0020] By adopting the above scheme, the grout can flow directly into the annular gap from the surface of the limiting ring, reducing flow resistance, increasing the grout filling speed, and directionally discharging the air bubbles generated during the grouting process through the through hole.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. It does not require the complete demolition of the original structure, reducing the need for re-drilling and effectively shortening the construction period. At the same time, it balances renovation efficiency and structural safety, making it suitable for renovation projects of old residential areas with limited funds and space. 2. It saves on material and labor costs and reduces material waste. 3. Improved overall bonding strength and load-bearing capacity. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0023] Figure 2 This is a plan view of the cutting and removal of the old handrail vertical bars according to an embodiment of this application.

[0024] Figure 3 This is a schematic diagram illustrating a usage scenario of an embodiment of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Step surface; 2. Old handrail vertical bar; 21. Insertion hole; 3. New handrail vertical bar; 31. Socket part; 311. Grouting hole; 312. Overflow hole; 313. Limiting ring. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0027] This application discloses a prefabricated handrail structure for the renovation of staircases in old residential communities. (Refer to...) Figure 1-3 A prefabricated handrail structure for the renovation of staircases in old residential communities includes old handrail vertical bars 2 and new handrail vertical bars 3. Both the old handrail vertical bars 2 and the new handrail vertical bars 3 are hollow tubes. The old handrail vertical bars 2 are axially cut along the step surface 1 and trimmed to form insertion holes 21. Therefore, the precise alignment of the old and new handrail vertical bars 2 is achieved, excessive offset is reduced, and the cut surface forms a natural stop, maximizing the axial load transfer efficiency of the structure.

[0028] Furthermore, the bottom of the new handrail vertical bar 3 is machined with a socket part 31 that fits into the insertion hole 21. The outer wall of the socket part 31 is fully welded to the inner wall of the insertion hole 21, forming an annular gap (not shown in the attached figure). The weld continuously fills all contact surfaces, improving the compressive and tensile strength, ensuring that the handrail is firm and reliable under vibration or load, reducing the risk of internal corrosion caused by moisture and dust intrusion, and improving safety redundancy.

[0029] Furthermore, the permanent connection reduces the fretting wear and temperature stress effects of the structure, extends its overall lifespan, and is suitable for the high-frequency use environment of staircases in old residential communities.

[0030] In summary, this structure reduces the need for re-drilling and the use of large equipment, effectively shortening the construction period. At the same time, it retains some of the original materials, saving material and labor costs while balancing renovation efficiency and structural safety. It is suitable for renovation projects in old residential areas with limited funds and space.

[0031] On the other hand, the inner wall of the new handrail vertical bar 3 is provided with a grouting hole 311 and an overflow hole 312. The overflow hole 312 is located directly above the grouting hole 311. The grouting hole 311 and the overflow hole 312 are connected through the internal cavity of the new handrail vertical bar 3. Cement mortar can be injected through the grouting hole 311 to fill the annular gap, so that the old handrail vertical bar 2 and the new handrail vertical bar 3 form an integral load-bearing structure.

[0032] Correspondingly, when cement mortar is injected into the grouting hole 311, the air in the internal cavity is naturally discharged from the overflow hole 312 above. When the cement mortar overflows from the overflow hole 312, it indicates that the gap has been completely filled, forming an intuitive sign of construction completion. Construction personnel can achieve precise grouting control through the dual-hole linkage mechanism, judge the filling rate in real time, reduce the void defects caused by blind injection, and improve construction quality and efficiency.

[0033] Furthermore, the dual-hole interconnection structure maintains the balance of internal and external air pressure during grouting, ensuring that the cement mortar flows evenly and densely in the gap between the socket 31 and the old rod, reducing the occurrence of local voids caused by air resistance. The high-position design of the overflow hole 312 can also intercept excess cement mortar that has not solidified, allowing it to flow back to the grouting hole 311 area through the inner cavity of the rod, reducing material waste and lowering the difficulty of later cleaning.

[0034] Furthermore, after the cement mortar is injected into the annular gap under high pressure through the grouting hole 311, a continuous curing layer is formed, which bonds the steel-mortar interface between the old and new handrail vertical bars 2, transforming the original separated components into a composite load-bearing body, improving the overall resistance to lateral displacement. The cured mortar layer acts as a stress buffer medium, which can evenly transmit the vibration load borne by the old handrail vertical bar 2 to the new handrail vertical bar 3, reducing local stress concentration.

[0035] Furthermore, the cement mortar filling the gaps and the synergistic global fusion reduce the erosion of the old handrail vertical bar 2 by external moisture, and its alkaline environment inhibits the electrochemical corrosion of the internal steel, reducing the risk of grouting layer failure.

[0036] In addition, epoxy resin adhesive can be used instead of cement mortar. It is injected through the grouting hole 311 to fill the annular gap, so that the old handrail vertical bar 2 and the new handrail vertical bar 3 form a whole. After the epoxy resin adhesive penetrates into the annular gap through the grouting hole 311, its polar molecules form chemical bonds with the metal surfaces of the old and new vertical bars, effectively improving the bonding strength and mechanical interlocking force compared with cement mortar.

[0037] Furthermore, the volume shrinkage of epoxy resin adhesive after curing reduces the risk of interfacial peeling caused by drying shrinkage of traditional cement-based materials. Its elastic modulus can absorb high-frequency vibrations, extending the maintenance cycle and making it suitable for deformation compensation of handrails in old residential areas.

[0038] On the other hand, the outer wall of the socket 31 is integrally formed with a limiting ring 313. The radial dimension of the limiting ring 313 is larger than the inner diameter of the insertion hole 21, forming a mechanical stop structure to ensure that the new handrail vertical bar 3 is automatically stopped at the preset depth when inserted into the old handrail vertical bar 2, reducing manual measurement errors and improving construction efficiency. When the railing is subjected to lateral impact, the limiting ring 313 contacts the end face of the old handrail vertical bar 2 to form a secondary force support point, converting the root bending moment into axial pressure and reducing the risk of weld fatigue.

[0039] Furthermore, the interference fit between the limiting ring 313 and the inner wall of the insertion hole 21 forms a natural sealing zone, reducing the seepage of cement mortar or epoxy resin adhesive during the grouting process and lowering the material loss rate.

[0040] Meanwhile, the circumferential surface of the limiting ring 313 is provided with a through hole (not shown in the attached figure) that communicates with the grouting hole 311, so that the grout flows directly into the annular gap from the surface of the limiting ring 313, thereby reducing the flow obstruction caused by the grout having to go around the edge of the limiting ring 313 in the traditional process, increasing the grout filling speed, and directionally discharging the air bubbles generated during the grouting process through the through hole, reducing the occurrence of gas accumulating below the limiting ring 313 to form a cavity.

[0041] Furthermore, the through-hole structure allows the grouting pressure to be applied evenly to both sides of the limiting ring 313, reducing the risk of ring deformation caused by unilateral pressure and ensuring equidistant filling of the gaps between the old and new handrail vertical bars 2.

[0042] The implementation principle of the prefabricated handrail structure for the renovation of staircases in old residential areas according to the embodiments of this application is as follows: the old handrail vertical bar 2 is cut off along the axial direction of the step surface 1 and trimmed to form a plug hole 21. The bottom of the new handrail vertical bar 3 is processed with a socket part 31 that fits into the plug hole 21. The outer wall of the socket part 31 is fully welded to the inner wall of the plug hole 21 to form an annular gap. Cement mortar or epoxy resin adhesive is injected through the grouting hole 311 to fill the gap. After the grout cures, it forms an integral load-bearing system, which improves the structural stability. At the same time, it reduces the re-drilling process and the use of large equipment, effectively shortens the construction period, saves material and labor costs, and realizes fast and safe handrail replacement. It is suitable for renovation projects of old residential areas with limited funds and space.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prefabricated handrail structure for the renovation of staircases in old residential communities, characterized in that, It includes an old handrail vertical bar (2) and a new handrail vertical bar (3). The old handrail vertical bar (2) is a hollow tube with a plug hole (21) along the axial direction. The bottom of the new handrail vertical bar (3) is provided with a socket (31) that is plugged into the plug hole (21). The outer wall of the socket (31) is fixedly connected to the inner wall of the plug hole (21) to form an annular gap.

2. The prefabricated handrail structure for the renovation of staircases in old residential areas according to claim 1, characterized in that, The insertion hole (21) is formed by cutting and trimming the old handrail vertical bar (2) along the step surface (1).

3. The prefabricated handrail structure for the renovation of staircases in old residential areas according to claim 1, characterized in that, The interface between the socket (31) and the insertion hole (21) is fully welded.

4. The prefabricated handrail structure for the renovation of staircases in old residential areas according to claim 1, characterized in that, The inner wall of the new handrail vertical bar (3) is provided with a grouting hole (311) and an overflow hole (312). The overflow hole (312) is located directly above the grouting hole (311). The grouting hole (311) and the overflow hole (312) are connected through the internal cavity of the new handrail vertical bar (3).

5. The prefabricated handrail structure for the renovation of staircases in old residential areas according to claim 4, characterized in that, Cement mortar can be injected through the grouting hole (311) to fill the annular gap, so that the old handrail vertical bar (2) and the new handrail vertical bar (3) form a whole.

6. The prefabricated handrail structure for the renovation of staircases in old residential areas according to claim 4, characterized in that, Epoxy resin adhesive can be injected through the grouting hole (311) to fill the annular gap, so that the old handrail vertical bar (2) and the new handrail vertical bar (3) form a whole.

7. The prefabricated handrail structure for the renovation of staircases in old residential areas according to claim 4, characterized in that, The outer wall of the socket (31) is provided with a limiting ring (313), the radial dimension of which is greater than the inner diameter of the insertion hole (21).

8. A prefabricated handrail structure for the renovation of staircases in old residential areas according to claim 7, characterized in that, The limiting ring (313) has a through hole on its annular surface that communicates with the grouting hole (311).

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