Novel connecting structure of precast concrete stairs

Abstract

The utility model discloses a novel connecting structure of a precast concrete stair, which comprises a stair main body, a plurality of connecting steps and a bottom end step, a mounting groove is formed in one side of the upper-layer platform, the top end step is clamped in the mounting groove, the top surface of the top end step and the upper-layer platform form a mounting step, and the height difference between the mounting step and the adjacent connecting step is the same; the bottom face of the bottom end step is fixedly connected with the lower layer platform, and the thickness of the bottom end step is the same as the height difference of the adjacent connecting step. The mounting groove is formed in one side of the upper-layer platform, and the top-end step is clamped in the mounting groove, so that the height difference between the top surface of the top-end step and the upper-layer platform forms a step on the uppermost layer; the bottom face of the bottom end step is fixedly connected with the lower-layer platform, so that the fall between the bottom end step and the lower-layer platform forms a step to the lower layer, and therefore the butt joint portions of the two ends of the stair body are hidden, butt joints are avoided, the attractiveness is improved, and meanwhile the safety risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building technology, and in particular to a novel connection structure for a precast concrete staircase. Background Technology

[0002] Prefabricated buildings are a new type of building production method that integrates various business areas such as R&D design, production and manufacturing, and on-site assembly, with standardized design, factory production, assembly construction, integrated decoration and information management as its characteristics, and the production of building products. It achieves energy conservation, environmental protection and full life cycle value maximization.

[0003] Prefabricated stairs refer to stairs in which the stair sections and landings are prefabricated in a factory and then assembled on site. Compared with traditional cast-in-place stairs, prefabricated stairs have advantages such as high precision, high construction efficiency, and low project cost. For common prefabricated stair installation structures in existing technologies, please refer to the prefabricated assembly stairs disclosed in CN112780035B.

[0004] In the prior art, please refer to the accompanying drawings in the specification of CN112780035B mentioned above. Figure 1 When installing prefabricated stairs, the top step is fitted into the pre-set installation groove of the upper beam, and the bottom step is fitted into the pre-set installation groove of the lower beam. This results in a splicing seam at the location of the splicing floor of the upper and lower layers after the prefabricated stairs are installed. The splicing seam is not only unsightly and difficult to handle, but also poses a safety risk such as tripping over users.

[0005] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0006] To address the problem in existing prefabricated staircases where the top step is fitted into a pre-set mounting groove on the upper beam and the bottom step into a pre-set mounting groove on the lower beam, resulting in a seam between the upper and lower floor surfaces after installation—a problem that is unsightly, difficult to manage, and poses a tripping hazard—this invention provides a novel connection structure for prefabricated concrete staircases.

[0007] This utility model is achieved through the following technical solution:

[0008] A novel connection structure for a precast concrete staircase, wherein the novel connection structure for the precast concrete staircase includes:

[0009] The main body of the staircase includes a top step, several connecting steps, and a bottom step.

[0010] An upper platform is provided with a mounting groove on one side. The top step is engaged in the mounting groove. The top surface of the top step and the upper platform form a mounting step. The height difference between the mounting step and the adjacent connecting step is the same.

[0011] The lower platform has its bottom surface fixedly connected to the bottom step, and the thickness of the bottom step is the same as the height difference between the adjacent connecting steps.

[0012] The novel connection structure of the precast concrete staircase, wherein a plurality of grouting sleeves are fitted inside the top step and the bottom step;

[0013] The installation groove is provided with a plurality of first inserts, and the plurality of first inserts correspond one-to-one with the plurality of grouting sleeves provided in the top step and are fixedly connected.

[0014] The lower platform is provided with a number of second inserts, and the number of second inserts corresponds one-to-one with the number of grouting sleeves provided in the bottom step and are fixedly connected.

[0015] The novel connection structure of the precast concrete staircase includes an installation beam arranged vertically on the lower side of the upper platform, a first embedded part arranged in the installation beam, an installation groove arranged on the installation beam, and a first reinforcing bar fixedly connected to the first embedded part.

[0016] A support beam is provided on the lower side of the lower platform along the vertical direction, and a second embedded part is provided in the support beam. The second reinforcing bar is fixedly connected to the second embedded part.

[0017] The novel connection structure of the precast concrete staircase includes an installation groove formed by bending the end of the installation beam; and the first reinforcing bar protruding vertically from the installation groove.

[0018] The novel connection structure of the precast concrete staircase includes a beam support on the installation beam, one side of the beam support being bent to form the installation groove, and the first insert bar being fixedly installed on the beam support in the vertical direction.

[0019] The novel connection structure of the precast concrete staircase, wherein the beam support includes:

[0020] The mounting component is disposed on one side of the mounting beam, and the lower end of the mounting component is bent at a predetermined angle. The first insert is fixedly disposed on the mounting component.

[0021] A locking component is provided on the other side of the mounting beam. The locking component is fixedly connected to the mounting component by a reinforcing bar. The reinforcing bar passes through the mounting beam and is fixedly connected to the first embedded component provided in the mounting beam.

[0022] The novel connection structure of the precast concrete staircase includes a beam support that further comprises several clamping plates, which are arranged parallel to and fixedly mounted on the mounting component.

[0023] The novel connection structure of the precast concrete staircase, wherein the second embedded part extends and is arranged within the lower platform;

[0024] The installation position of the bottom step corresponds to the position of the support beam on the lower platform.

[0025] The novel connection structure of the precast concrete staircase includes a third embedded part inside the staircase body, and a plurality of installation sleeves on one side of the staircase body corresponding to the connecting step. The installation sleeves are fixedly connected to the third embedded part and are used to install the railing.

[0026] The novel connection structure of the precast concrete staircase includes a waterproof component provided at the position corresponding to the mounting groove of the top step, and the waterproof component is continuously provided along the joint between the top step and the mounting groove.

[0027] The beneficial effects of this utility model are as follows: By setting an installation groove on one side of the upper platform, the top step is engaged in the installation groove, so that the top surface of the top step and the upper platform form the topmost step; the bottom surface of the bottom step is fixedly connected to the lower platform, so that the bottom step and the lower platform form the bottom step, thereby hiding the joints at both ends of the staircase, avoiding the existence of joint seams, improving the integrity of the upper and lower platform floors, improving aesthetics while reducing safety risks. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of the novel connection structure of the precast concrete staircase of this utility model;

[0029] Figure 2 This is a schematic diagram of the installation structure of the upper platform in a specific embodiment of the novel connection structure of the precast concrete staircase of this utility model;

[0030] Figure 3 This is a schematic diagram of the installation structure of the lower platform in the novel connection structure of the precast concrete staircase of this utility model.

[0031] exist Figures 1 to 3In the middle: 100, main body of the staircase; 101, grouting sleeve; 110, top step; 120, connecting step; 130, bottom step; 140, third embedded part; 141, installation sleeve; 200, upper platform; 201, first reinforcing bar; 210, installation groove; 220, installation beam; 221, first embedded part; 300, lower platform; 301, second reinforcing bar; 310, support beam; 311, second embedded part. Detailed Implementation

[0032] To make the objectives, technical solutions, and effects of this utility model clearer and more explicit, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] In the prior art, please refer to the accompanying drawings in the specification of CN112780035B mentioned above. Figure 1 When installing prefabricated stairs, the top step is fitted into the pre-set installation groove of the upper beam, and the bottom step is fitted into the pre-set installation groove of the lower beam. This results in a splicing seam at the location of the splicing floor of the upper and lower layers after the prefabricated stairs are installed. The splicing seam is not only unsightly and difficult to handle, but also poses a safety risk such as tripping over users.

[0036] Based on the aforementioned technical problems in the prior art, this utility model provides a novel connection structure for a precast concrete staircase, such as... Figure 1As shown, the novel connection structure of the precast concrete staircase includes: a staircase body 100, which includes a top step 110, several connecting steps 120, and a bottom step 130; an upper platform 200, on one side of which is provided an installation groove 210, in which the top step 110 is engaged and installed, the top surface of which forms an installation step with the upper platform, and the height difference between the installation step and the adjacent connecting steps is the same; and a lower platform 300, in which the bottom surface of the bottom step 130 is fixedly connected to the lower platform 300, and the thickness of the bottom step 130 is the same as the height difference between the adjacent connecting steps 120.

[0037] This utility model provides an installation groove 210 on one side of the upper platform 200, and engages the top step 110 within the installation groove 210, so that the difference in height between the top surface of the top step 110 and the upper platform 200 forms the uppermost step, i.e., the installation step; and fixes the bottom surface of the bottom step 130 to the lower platform 300, so that the difference in height between the bottom step 130 and the lower platform 300 forms the lower step, thereby concealing the joints at both ends of the staircase body 100, avoiding the presence of joint seams, improving the integrity of the upper and lower platform 300 floors, enhancing aesthetics while reducing safety risks.

[0038] In the above embodiments, such as Figure 1 As shown, the novel connection structure of the precast concrete staircase of this utility model mainly consists of a staircase body 100, an upper platform 200, and a lower platform 300. The upper platform 200 and the lower platform 300 are the floors of the upper and lower floors in the building. The staircase body 100 is a precast staircase. During installation, the upper end of the staircase body 100 corresponds to the upper platform 200, and the lower end corresponds to the lower platform 300, thereby forming a passage structure connecting the upper and lower floors of the building. In this embodiment, for ease of description, the staircase body 100 is divided into top steps 110, several connecting steps 120, and bottom steps 130 according to different areas of its steps. Specifically, the top steps 110 are the steps located at the top, the bottom steps 130 are the steps located at the bottom, and the connecting steps 120 are several steps between the top steps 110 and the bottom steps 130.

[0039] Specifically, unlike existing technologies, such as Figure 1As shown, on the upper platform 200, an installation groove 210 for connecting the stair body 100 is provided on one side of the upper platform 200. The aforementioned top step 110 is engaged in the installation groove 210, and the installation groove 210 has a certain height in the vertical direction. When the top step 110 is engaged in the installation groove 210, the height difference between the top surface of the top step 110 and the top surface of the upper platform 200 is the same as the height difference of the adjacent connecting step 120. Even if the distance between the top step 110 and the upper platform 200 forms the top step in the traditional sense of a staircase, the advantage of this setting is that, on the one hand, it hides the joint between the stair body 100 and the upper platform 200 during installation, so that the floor of the upper platform 200 can be integrated, thereby preventing users from tripping due to differences in height or gaps in the joint area; on the other hand, it reduces the length of the stair body 100, thereby facilitating the transportation and hoisting of the prefabricated stair body 100.

[0040] Correspondingly, during the installation of the lower platform 300 and the stair body 100, the bottom surface of the bottom step 130 is fixedly connected to the lower platform 300, and the thickness of the bottom step 130 is the same as the height difference of the adjacent connected step 120. Even if the distance between the bottom step 130 and the lower platform 300 forms the lowest step in the traditional sense of a staircase, the advantages of this setting are that, on the one hand, it avoids setting a groove structure on the ground of the lower platform 300, reducing the workload; on the other hand, it hides the joint between the stair body 100 and the lower platform 300 during installation, allowing the floor of the lower platform 300 to be installed as a whole, thereby preventing users from tripping due to differences in height or gaps in the joint area; in addition, it further reduces the length of the stair body 100, making it easier to transport and hoist the prefabricated stair body 100.

[0041] In this embodiment, since no assembly structure is provided on the ground area of ​​the upper platform 200 and the lower platform 300, the activity area of ​​the upper platform 200 and the lower platform 300 is increased without the influence of the joint, which facilitates the implementation of decoration. At the same time, since the main installation groove 210 structure for installing the main body of the staircase 100 is set on the side of the upper platform 200, and the length of the main body of the staircase 100 that needs to be prefabricated is shortened, a wider construction area and personnel standing space can be provided when the main bodies of the staircases 100 are set continuously in multiple layers, which is conducive to improving construction efficiency and construction quality.

[0042] Based on the above embodiments, in one specific embodiment of this utility model, such as Figure 2 and Figure 3As shown, to ensure accurate alignment and secure installation of the staircase body 100 during installation, several grouting sleeves are fitted inside the top step 110 and bottom step 130 of the staircase body 100. Correspondingly, several first reinforcing bars 201 are installed in the mounting groove 210 of the upper platform 200, which are pre-embedded during the construction of the upper platform 200. Several second reinforcing bars 301 are installed on the lower platform 300, which are pre-embedded during the construction of the lower platform 300. The positions of the first reinforcing bars 201 and the several grouting sleeves in the top step 110 are... The positions of the cylinders 101 correspond one-to-one; during the installation of the stair body 100, after the top step 110 is aligned with the mounting groove 210, several first inserts 201 are inserted into several grouting sleeves 101, which directly forms the positioning and installation of the top step 110, and makes the top step 110 snap into and fix it in the mounting groove 210; then the stair body 100 is lowered naturally, so that the bottom step 130 is placed on the lower platform 300, and the grouting sleeves 101 on the bottom step 130 are fitted with the second inserts 301 on the lower platform 300, which forms the positioning and installation of the bottom step 130, forming as follows. Figure 1 The installation structure is shown.

[0043] In this embodiment, since the mounting slot 210 is located on the side of the upper platform 200, workers can assist in directional installation on the upper platform 200 during the construction phase. This provides a larger operating area and reduces the difficulty of hoisting. When the top step 110 is in place, the bottom step 130 naturally forms a corresponding position, making the installation very simple and quick.

[0044] In another possible embodiment of this utility model, such as Figure 2 As shown, to ensure the structural stability of the upper platform 200 and the installation stability of the staircase body 100, an installation beam 220 is provided vertically on the lower side of the upper platform 200 in this embodiment. In the prior art, beam structures are provided in building floor platforms to support the platform structure. In this application, unlike the prior art, the installation groove 210 is provided on the installation beam 220. Specifically, the installation beam 220 is provided vertically on the lower side of the upper platform 200. A first embedded part 221 is provided in the installation beam 220. The embedded part is formed by bending steel bars and other materials to improve the compressive strength of the installation beam 220. In this embodiment, the first reinforcing bar 201 is fixedly connected to the first embedded part 221, so that the first reinforcing bar 201 and the installation beam 220 form a stable overall structure to ensure that the staircase body 100 is stably connected to the installation beam 220 after installation.

[0045] Correspondingly, a support beam 310 is provided vertically on the lower side of the lower platform 300. The support beam 310 is similar to the installation beam 220 and is used to support the platform. A second embedded part 311 is provided inside the support beam 310. The second embedded part 311 is also formed by bending steel bars and other materials to improve the compressive strength of the support beam 310. In this embodiment, the second reinforcing bar 301 is fixedly connected to the second embedded part 311, so that the second reinforcing bar 301 and the support beam 310 form a stable overall structure to ensure that the connection between the staircase body 100 and the lower platform 300 is stable after installation.

[0046] Furthermore, in the above embodiments, the mounting groove 210 in the mounting beam 220 structure of the upper platform 200 has various configuration forms:

[0047] In the first embodiment where the mounting slot 210 is provided, as Figure 2 As shown, the installation beam 220 can be prefabricated with its ends as a bent structure, i.e., an L-shaped structure, so that the installation groove 210 is formed on one side of the installation beam 220. In this embodiment, the first embedded part 221 inside the installation beam 220 should also be pre-set to adapt to the shape of the installation beam 220 to ensure the load-bearing stability and deformation resistance of the installation beam 220. In this embodiment, the first insert 201 should be set to protrude from the installation groove 210 in the vertical direction, i.e., protrude upward along the bent end of the installation beam 220. So that after the top step 110 of the stair body 100 is placed, the first insert 201 and the grouting sleeve 101 in the top step 110 can be fitted vertically to facilitate installation and subsequent fixing. This setting method is suitable for situations where the building floor height is high.

[0048] In the second embodiment of the mounting groove 210, the shape of the mounting beam 220 can be set to that of a traditional mounting beam 220. A beam support is provided on the mounting beam 220 for installing the stair body 100. The beam support is made of cast steel and is fixedly installed on the mounting beam 220. By pre-setting the shape of the beam support, one side of the beam support is bent to form the mounting groove 210, so as to achieve the same effect as in the previous embodiment of fixing the top step 110 by engaging the mounting groove 210. In this embodiment, the first insert 201 should be fixedly installed vertically on the bent part of the beam support, that is, protruding upward along the bent end of the beam support. So that after the top step 110 of the stair body 100 is placed, the first insert 201 can be vertically engaged with the grouting sleeve 101 in the top step 110 to facilitate installation and subsequent fixing. This method is suitable for buildings with low floor heights.

[0049] In another possible embodiment of this utility model, such as Figure 3As shown, in the lower platform 300, the support beam 310 is located below the lower platform 300 to support it. Since the bottom step 130 is installed on the top surface of the lower platform 300, in order to ensure the structural integrity of the lower platform 300 and prevent deformation or damage, in this embodiment, the second embedded part 311 is preferably extended into the lower platform 300, so that the lower platform 300 and the support part form an integral whole and jointly bear the function of supporting the main body of the staircase 100. In addition, the installation position of the bottom step 130 should correspond to the position of the support beam 310 on the lower platform 300, so that the stress direction corresponds to the support beam 310, so as to ensure that the lower platform 300 has sufficient supporting force to bear the support beam 310.

[0050] In the above embodiments, such as Figure 1 As shown, in the novel connection structure of the precast concrete staircase of this utility model, the joint of the top step 110 is located on one side of the upper platform 200, along the vertical direction, while the joint of the bottom step 130 is located above the lower platform 300, along the horizontal direction. Therefore, the joint between the top step 110 and the upper platform 200 is prone to water and corrosive liquids entering after long-term use, causing the first reinforcing bar 201 below to rust and corrode, creating a safety hazard. Therefore, in order to achieve waterproof protection, a waterproof component is also provided at the position corresponding to the top step 110 and the mounting groove 210 in this embodiment. The waterproof component can be a PE rod. PE rods have high strength and rigidity, are lightweight and easy to process, have good anti-corrosion and waterproof performance, and can also be used for decoration. In actual installation, the waterproof component should be continuously installed along the joint between the top step 110 and the mounting groove 210, and fixed and sealed with waterproof glue, fixing glue and other materials to achieve better waterproof and aesthetic effects.

[0051] In another possible embodiment of this utility model, such as Figure 1 As shown, a third embedded part 140 is also provided inside the main body of the staircase 100. The third embedded part 140 is made of steel bars and is used to maintain the structural strength of the main body of the staircase 100. Several installation sleeves 141 are provided on one side of the main body of the staircase 100 corresponding to the step 120. The installation sleeves 141 are fixedly connected to the third embedded part 140. After the main body of the staircase 100 is installed on the upper platform 200 and the lower platform 300, suitable railings can be installed at the position of the installation sleeves 141, which facilitates the assembly process and subsequent processing.

[0052] Based on the above embodiments, the specific installation process of the novel connection structure of the precast concrete staircase of this utility model is as follows:

[0053] like Figure 1As shown, the prefabricated staircase body 100 is hoisted to the position between the corresponding upper platform 200 and lower platform 300;

[0054] like Figure 2 As shown, the grouting sleeve 101 on the top step 110 is fitted into the first insert 201 in the mounting groove 210 on one side of the upper platform 200, as shown. Figure 3 As shown, while lowering the main staircase 100, the grouting sleeve 101 on the bottom step 130 is aligned with the second reinforcing bar 301 on the lower platform 300. After lowering the main staircase 100 to the predetermined position, grout is injected into the grouting sleeve 101, so that the main staircase 100 is in the position shown. Figure 1 The installation is complete as shown.

[0055] Waterproof components are installed at the corresponding positions of the top step 110 and the mounting groove 210, thus completing the installation of the stair body 100. Finally, the railing can be installed in the mounting sleeve 141 on the stair body 100, thus completing the assembly of the entire stair body 100.

[0056] In summary, this utility model provides a novel connection structure for a precast concrete staircase. This novel connection structure includes: a staircase body comprising a top step, several connecting steps, and a bottom step; an upper platform with an installation groove on one side, where the top step is engaged with the installation groove, the top surface of the top step forming an installation step with the upper platform, and the installation step having the same height difference as the adjacent connecting steps; and a lower platform with the bottom surface of the bottom step fixedly connected to the lower platform, the thickness of the bottom step having the same height difference as the adjacent connecting steps. This utility model features an installation groove on one side of the upper platform, into which the top step is engaged, creating a single step at the top level by adjusting the height difference between the top surface of the top step and the upper platform. The bottom surface of the bottom step is fixedly connected to the lower platform, creating a single step at the bottom level by adjusting the height difference between the bottom step and the lower platform. This conceals the joints at both ends of the staircase, eliminating seams and improving the overall integrity of the upper and lower platforms. This enhances aesthetics while reducing safety risks.

[0057] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A novel connection structure for a precast concrete staircase, characterized in that, The novel connection structure of the precast concrete staircase includes: The main body of the staircase includes a top step, several connecting steps, and a bottom step. An upper platform is provided with a mounting groove on one side. The top step is engaged in the mounting groove. The top surface of the top step and the upper platform form a mounting step. The height difference between the mounting step and the adjacent connecting step is the same. The lower platform has its bottom surface fixedly connected to the bottom step, and the thickness of the bottom step is the same as the height difference between the adjacent connecting steps.

2. The novel connection structure of the precast concrete staircase according to claim 1, characterized in that, Several grouting sleeves are fitted inside the top step and the bottom step; The installation groove is provided with a plurality of first inserts, and the plurality of first inserts correspond one-to-one with the plurality of grouting sleeves provided in the top step and are fixedly connected. The lower platform is provided with a number of second inserts, and the number of second inserts corresponds one-to-one with the number of grouting sleeves provided in the bottom step and are fixedly connected.

3. The novel connection structure of the precast concrete staircase according to claim 2, characterized in that, An installation beam is provided on the lower side of the upper platform along the vertical direction. A first embedded part is provided in the installation beam. The installation groove is provided on the installation beam. The first insert is fixedly connected to the first embedded part. A support beam is provided on the lower side of the lower platform along the vertical direction, and a second embedded part is provided in the support beam. The second reinforcing bar is fixedly connected to the second embedded part.

4. The novel connection structure of the precast concrete staircase according to claim 3, characterized in that, The end of the mounting beam is bent to form the mounting groove; the first insert bar protrudes vertically from the mounting groove.

5. The novel connection structure of the precast concrete staircase according to claim 3, characterized in that, The mounting beam is provided with a beam support, and one side of the beam support is bent to form the mounting groove. The first insert is fixedly installed on the beam support in the vertical direction.

6. The novel connection structure of the precast concrete staircase according to claim 5, characterized in that, The beam support includes: The mounting component is disposed on one side of the mounting beam, and the lower end of the mounting component is bent at a predetermined angle. The first insert is fixedly disposed on the mounting component. A locking component is provided on the other side of the mounting beam. The locking component is fixedly connected to the mounting component by a steel bar. The steel bar passes through the mounting beam and is fixedly connected to the first embedded component provided in the mounting beam.

7. The novel connection structure of the precast concrete staircase according to claim 6, characterized in that, The beam support also includes several clamping plates, which are arranged parallel to and fixedly mounted on the mounting component.

8. The novel connection structure of the precast concrete staircase according to claim 3, characterized in that, The second embedded part extends and is arranged within the lower platform; The installation position of the bottom step corresponds to the position of the support beam on the lower platform.

9. The novel connection structure of the precast concrete staircase according to claim 1, characterized in that, The staircase body has a third embedded part inside, and a number of installation sleeves are provided on one side of the staircase body corresponding to the connecting steps. The installation sleeves are fixedly connected to the third embedded part and are used to install the railing.

10. The novel connection structure of the precast concrete staircase according to claim 1, characterized in that, A waterproof component is provided at the position corresponding to the mounting groove of the top step, and the waterproof component is continuously provided along the joint between the top step and the mounting groove.

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