CN102296837A - Multi-storey building with prefabricated members and semi-prefabricated construction method thereof - Google Patents

Abstract

The invention discloses a multi-storey building with prefabricated parts and a semi-prefabricated construction method thereof, wherein the multi-storey building comprises the following components: the prefabricated wall comprises a prefabricated outer wall (1), a cast-in-place wall body (2), a semi-prefabricated floor slab (31), a cast-in-place floor slab (32), a prefabricated staircase (6), a prefabricated bathroom (7) and a prefabricated kitchen (8); mounting holes (61) for pouring mortar are formed in the upper end and the lower end of the prefabricated staircase (6), exposed steel bars are fixedly arranged on floor slabs connected with the upper end and the lower end of the prefabricated staircase (6), and the exposed steel bars are inserted into the corresponding mounting holes (61) and fixed through pouring mortar; horizontal exposed steel bars are preset at the bottoms of the prefabricated bathroom (7) and the prefabricated kitchen (8), and the horizontal exposed steel bars are mutually connected with steel bars in the cast-in-place floor slab (32). The multi-storey building and the semi-prefabricated construction method thereof have very short construction period, can construct a standard floor within four days, reduce the idle time of workers to the minimum, and have more uniform quality standard.

Description

Multi-storey building with prefabricated parts and its semi-prefabricated construction method

technical field

The invention relates to a multi-storey building and a construction method thereof, in particular to a multi-storey building with prefabricated components and a semi-prefabricated construction method thereof.

Background technique

In the prior art, the traditional construction method of multi-storey buildings is generally as follows: 1) first build the steel mesh for the load-bearing walls and columns, then install the formwork around the steel mesh, and then pour concrete into the formwork to form the load-bearing walls and columns; 2 ) Install the formwork and support frame for the floor slab and supporting beams, then lay steel bars for the slab and beams in the formwork, and then pour concrete into the formwork to form the floor slab and beams; 3) Remove the support frame for the next floor, press The above steps complete the construction of the upper floor of the building. The disadvantages of this traditional construction method are: building buildings layer by layer, not only has a long construction period and high construction costs, but also has serious noise and dust pollution on the construction site, and it is difficult to ensure that the buildings have uniform quality standards.

For this reason, some multi-storey buildings with prefabricated components have appeared now, such as the Chinese invention patent with the patent number ZL97125767. The construction volume and shorten the construction period, and realize the standardization of construction. But even like this, the construction amount of toilets, kitchens, stairs, etc. of each suite in the building is still very large, so its construction period is still unsatisfactory.

Contents of the invention

Aiming at the defects of the prior art, the invention provides a multi-storey building with a very short construction period and more uniform quality standards and a construction method thereof.

The technical scheme of the present invention is as follows: design a multi-storey building with prefabricated parts, including: prefabricated exterior walls, cast-in-place walls, semi-prefabricated floors and cast-in-place floors; in addition, prefabricated stairs, prefabricated bathrooms and prefabricated kitchens; The upper and lower ends of the prefabricated stairs are provided with installation holes for pouring mortar, and the floors connecting the upper and lower ends of the prefabricated stairs are fixed with exposed steel bars, and the exposed steel bars are inserted into the corresponding installation holes and fixed by pouring mortar; The bottom of the prefabricated bathroom and the prefabricated kitchen are preset with horizontal exposed steel bars, and the horizontal exposed steel bars are connected with the steel bars in the cast-in-place floor slab.

The upper and lower ends of the prefabricated staircase respectively extend outwards with connecting parts, and the installation holes for pouring mortar are arranged at the connecting parts; The concave platform at the top of the concave platform, and the exposed steel bars are fixed on the top of the concave platform.

At least one wall unit of the prefabricated bathroom or prefabricated kitchen is a semi-prefabricated wall with alternately concave and convex rough outer surfaces, and the wall unit is integrated with the cast-in-place wall on the same floor.

Alternatively, at least one wall unit in the prefabricated bathroom is a full prefabricated wall and is provided with a first grouting channel located in the lower wall and a grouting hole communicated with the first grouting channel and arranged on the wall, the first grouting The channel is docked with the second grouting channel provided on the adjacent lower wall, and the first grouting channel and the second grouting channel are inserted with internal steel bars and fixed by pouring mortar.

Alternatively, at least one wall unit in the prefabricated kitchen is a full prefabricated wall and is provided with a third grouting channel located in the lower wall and a grouting hole communicated with the third grouting channel and arranged on the wall, the third grouting The channel is docked with the fourth grouting channel provided on the adjacent lower wall, and the third grouting channel and the fourth grouting channel are inserted with internal steel bars and fixed by pouring mortar.

The semi-prefabricated construction method of above-mentioned multi-story building comprises the following steps:

A． Lay the semi-prefabricated slab and lay steel bars on the semi-prefabricated slab;

B． Placement and fixation of prefabricated exterior walls, prefabricated bathrooms and prefabricated kitchens, fastening the reinforcement of load-bearing walls and columns and fixing the formwork;

C． Pouring concrete in the template to complete the production of load-bearing walls and columns, and pouring concrete on the semi-prefabricated floor slab that has been laid with steel bars to complete the production of the floor slab;

D． Placement and fixing of prefabricated stairs, completion of installation of prefabricated stairs, removal of formwork for load-bearing walls and columns.

In each of the above steps, the concrete is pumped from the concrete mixing device to the working floor through the high-pressure pump, and the concrete mixing device is arranged on the bottom surface of the working floor.

Said steps A, B, C or D are carried out across different wings of the building in one day.

In the step B, the preset horizontal exposed steel bars at the bottom of the prefabricated bathroom and the prefabricated kitchen are connected with the steel bars laid on the semi-prefabricated floor; in the step C, at least one wall of the prefabricated bathroom is also connected The surface unit is fixedly connected to the adjacent wall, and at least one wall unit of the prefabricated kitchen is fixedly connected to the adjacent wall.

At least one wall unit of the prefabricated bathroom or prefabricated kitchen is a semi-prefabricated wall. In the step C, the semi-prefabricated wall of the prefabricated bathroom or prefabricated kitchen is integrated with the cast-in-place wall on the same floor.

Alternatively, at least one wall unit of the prefabricated bathroom or prefabricated kitchen is a full prefabricated wall and is provided with a connection hole located in the lower wall and a grouting hole communicated with the connection hole and arranged on the wall surface. The connecting holes provided on the adjacent lower walls are docked. In the step C, insert internal steel bars into the connecting holes of the prefabricated bathroom or prefabricated kitchen and the connecting holes in the lower walls, and pour mortar to connect the upper and lower walls. body fixed together.

In the step D, the preset exposed steel bars on the floor connected to the upper and lower ends of the prefabricated stairs are inserted into the installation holes provided at the upper and lower ends of the prefabricated stairs, and mortar is poured into the installation holes to make the prefabricated stairs Fastened together with the floor. the

Compared with the prior art, the multi-storey building with prefabricated parts and its semi-prefabricated construction method of the present invention not only adopts semi-prefabricated floor slabs and prefabricated exterior walls, but also adopts prefabricated bathrooms, prefabricated kitchens and prefabricated stairs, reducing the number of cast-in-place structures. Therefore, the construction period can be greatly shortened, and the construction quality standard is more uniform; in addition, the construction materials are transported to the operation floor by tower crane, and the required concrete is pumped to the operation floor by concrete pump, and each construction step can be completed within one day. Working across different wings of the building minimizes idle time for workers, thus greatly improving construction efficiency, with a standard floor being completed within four working days.

Description of drawings

Fig. 1 is the structural representation of the multi-storey building with prefabricated part of the present invention;

Fig. 2 is the structural representation of described prefabricated staircase 6;

Fig. 3 is the installation schematic diagram of described prefabricated staircase 6;

Fig. 4 is the enlarged view of described prefabricated staircase 6 and floor slab junction;

Fig. 5 is a schematic diagram of the three-dimensional structure of the prefabricated bathroom 7;

Fig. 6 is a structural schematic diagram of the connection between the preset horizontal steel bar at the bottom of the prefabricated bathroom 7 and the floor steel bar;

Fig. 7 is a schematic structural view of the surface of the semi-prefabricated wall unit of the prefabricated bathroom 7;

Fig. 8 is a connection schematic diagram of the external reinforcement mesh of the semi-prefabricated wall unit of the prefabricated bathroom 7;

Fig. 9 is a schematic diagram of the connection between the semi-prefabricated wall unit of the prefabricated bathroom 7 and the cast-in-place wall 2;

Fig. 10 is a connection structure diagram between the fully prefabricated wall unit of the prefabricated bathroom 7 and the adjacent wall of the lower floor;

FIG. 11 is a schematic diagram of the three-dimensional structure of the prefabricated kitchen 8;

Fig. 12 is a structural schematic diagram of the connection between the preset horizontal steel bars at the bottom of the prefabricated kitchen 8 and the floor steel bars;

Fig. 13 is a schematic structural view of the surface of the semi-prefabricated wall unit of the prefabricated kitchen 8;

Fig. 14 is a schematic diagram of the connection of the external reinforcement mesh of the semi-prefabricated wall unit of the prefabricated kitchen 8;

Fig. 15 is a schematic diagram of the connection between the semi-prefabricated wall unit of the prefabricated kitchen 8 and the cast-in-place wall 2;

Fig. 16 is a connection structure diagram between the fully prefabricated wall unit of the prefabricated kitchen 8 and the adjacent wall on the lower floor;

Figure 17 is a schematic structural view of a multi-storey building before the four-day construction cycle;

Figure 18 is a schematic diagram of the construction site on the first day;

Figure 19 is a schematic diagram of the construction site on the second day;

Figure 20 is a schematic diagram of the construction site on the third day;

Fig. 21 is a schematic diagram of the construction site on the fourth day.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

The multi-storey building with prefabricated parts of the present invention is mainly composed of walls, floor slabs, stairs, load-bearing columns and beams, etc., wherein, as shown in Figure 1, the walls are composed of prefabricated exterior walls 1 and cast-in-place walls 2, The left and right ends of the prefabricated outer wall 1 have preset exposed steel bars and are integrated with the cast-in-place wall 2 . The floor 3 is composed of a semi-prefabricated floor 31 and a cast-in-place floor 32 formed by laying steel bars on the semi-prefabricated floor 31 and pouring concrete. The special feature of the present invention is that the staircase adopts the prefabricated staircase 6, and also adopts the prefabricated bathroom 7 and the prefabricated kitchen 8, which can greatly reduce the workload of on-site construction and contribute to a more unified building standard.

As shown in Fig. 2, Fig. 3 and Fig. 4, the described prefabricated staircase 6 is a section of stair plate erected between the floor 3 and the half-floor platform, that is, the staircase of a standard floor is composed of two prefabricated staircases 6, and the prefabricated staircase 6 Can be preset with handrail 63 and the anti-slip strip that is positioned on the step at the same time. The upper and lower ends of the prefabricated staircase 6 are respectively extended outwards with connecting parts 62 , and each connecting part 62 is provided with two installation holes 61 for pouring mortar. The end of the cast-in-place floor 32 connecting the upper and lower ends of the prefabricated staircase 6 is provided with a concave platform 33 supporting the connecting portion 62, and the top of the concave platform 33 on each side corresponds to the position of the installation hole 61. 34, and the exposed steel bar 34 is inserted into the corresponding installation hole 61 and the prefabricated staircase 6 and the cast-in-place floor 32 are fixedly connected by pouring mortar.

The wall, ceiling, floor, etc. of the prefabricated bathroom 7 are prefabricated in the factory, and windows can be arranged on the wall, and water supply and drainage pipes, wiring pipes, and lighting control boxes are embedded in the wall. Sanitary ware can be installed at the same time. As shown in FIGS. 5 and 6 , horizontal exposed steel bars 74 are preset at the bottom of the prefabricated bathroom 7 for connecting with the steel bars 321 adjacent to the cast-in-place floor 32 . One of the wall outer surfaces of the prefabricated bathroom 7 can also be provided with a temporary fixing nut 75, which is temporarily connected with the wall of the adjacent floor through a connector 76 when the prefabricated bathroom is installed, and the prefabricated bathroom 7 is connected to the lower floor or the same floor Remove the temporary fixing nut 75 and the connector 76 after the object structure wall is tightly connected.

In order to fix the prefabricated bathroom 7 more reliably, it is necessary to connect its wall with the adjacent structural wall, for which there are two connection methods. the

Mode 1, as shown in Figure 7, Figure 8 and Figure 9, at least one wall unit of the prefabricated bathroom 7 is a semi-prefabricated wall 70 with a rough outer surface with alternating concave and convex, and steel bars are bound outside the semi-prefabricated wall 70 21 and 22 and pour concrete to form the cast-in-place wall 2, thus the semi-prefabricated wall 70 can be fixedly connected with the cast-in-place wall 2 on the same floor.

Mode 2, as shown in Figure 10, at least one wall unit of the prefabricated bathroom 7 is a full prefabricated wall 70 and is provided with a first grouting channel 71 located in the lower structural wall and communicated with the first grouting channel 71 The grouting hole 73 on the wall surface, the first grouting channel 71 is connected with the second grouting channel 72 provided on the adjacent substructure wall, and the first grouting channel 71 and the second grouting channel 72 are inserted with internal The steel bars 77 are poured with mortar so as to fix and connect the full prefabricated wall 70 and the lower structural wall as a whole.

Similarly, the walls, ceilings, floor, etc. of the prefabricated kitchen 8 are prefabricated in the factory, and windows can be arranged on the walls, and water supply and drainage pipes, wiring pipes, lighting control boxes, etc. are pre-buried in the walls. , It can also be installed with a stove and a washbasin at the same time. As shown in FIGS. 11 and 12 , horizontal exposed steel bars 84 are preset at the bottom of the prefabricated kitchen 8 for connecting with the steel bars 321 adjacent to the cast-in-place floor 32 . One of the wall outer surfaces of the prefabricated kitchen 8 may also be provided with a temporary fixing nut 85 for temporarily connecting the prefabricated kitchen 8 with the wall of the adjacent floor through a connector 86, and the prefabricated kitchen 8 is connected to the lower floor or the same floor. The temporary fixing nut 85 and the connecting piece 86 are removed after the structural wall of the building is tightly connected.

In order to fix the prefabricated kitchen 8 more reliably, it is necessary to connect its wall with the adjacent structural wall, for which there are two ways of connection. the

Mode 1, as shown in Figures 11 to 15, at least one wall unit of the prefabricated kitchen 8 is a semi-prefabricated wall 80 with a rough outer surface with alternating concave and convex, and steel bars 21 and 22 are tied outside the semi-prefabricated wall 80 Concrete is also poured to form the cast-in-place wall 2, so that the semi-prefabricated wall 80 and the cast-in-place wall 2 of the same layer can be fixedly connected as a whole.

Mode 2, as shown in Figure 10, at least one wall unit in the prefabricated kitchen 8 is a full prefabricated wall and is provided with a third grouting channel 81 located in the lower wall and communicated with the third grouting channel 81 and arranged on the wall The grouting hole 83 on the surface, the third grouting channel 81 is docked with the fourth grouting channel 82 provided on the adjacent lower structure wall, the third grouting channel 81 and the fourth grouting channel 82 are inserted with internal steel bars and The full prefabricated wall 80 and the substructure wall are fixedly connected as one by pouring mortar.

Fig. 17 is a structural schematic diagram of a certain floor that has been built. The semi-prefabricated construction method of the multi-storey building of the present invention builds a standard floor on this basis and includes the following steps:

A． As shown in Figure 18, the semi-prefabricated floor 31 is lifted into place with a crane and laid and fixed, and the reinforcing bar 321 is laid on the semi-prefabricated floor 31;

B． As shown in Figure 19, the prefabricated exterior wall 1, prefabricated bathroom 7 and prefabricated kitchen 8 are placed and fixed, and the horizontal exposed steel bars 74 and 84 preset at the bottom of the prefabricated bathroom 7 and the prefabricated kitchen 8 are connected with the steel bars laid on the semi-prefabricated floor 31 321 are connected together, tie the steel bars of load-bearing wall 2 and column 5 and fix the formwork;

C． As shown in Figure 20, concrete is poured in the formwork to complete the making of the load-bearing wall 2 and the column 5, and the semi-prefabricated floor 31 is used as a formwork, and concrete is poured on the semi-prefabricated floor 31 that has laid steel bars to form a cast-in-situ floor 32, and the floor 3 is completed. production;

D． As shown in Figure 21, the prefabricated staircase 6 is hoisted between the concave platforms 33 of the upper and lower floors 32 with a crane, so that the exposed steel bars 34 protruding from the upper and lower concave platforms 33 and the mounting holes 61 on the connecting parts 62 at the two ends of the prefabricated staircase 6 are located. Relatively insert, and pour mortar in the installation hole 61 to fix the prefabricated staircase 6 and the upper and lower floors 32 together, so as to complete the installation of the prefabricated staircase 6. At this time, the strength of the cast-in-place load-bearing wall 2 and the cast-in-place floor 32 meets the conditions , the formwork of the load-bearing wall 2 and the column 5 can be removed.

In the above step C, at least one wall unit of the prefabricated bathroom 7 and the prefabricated kitchen 8 needs to be fixedly connected to the adjacent structural wall, and the wall unit used for connection can be a semi-prefabricated wall or a fully prefabricated wall.

When the prefabricated bathroom 7 or prefabricated kitchen 8 is used to connect the wall unit with the adjacent structural wall when it is a semi-prefabricated wall, tie the reinforcement mesh outside the semi-prefabricated wall to connect the lower reinforcement 21 with the working layer reinforcement 22 After pouring concrete together, the semi-prefabricated wall of the prefabricated bathroom 7 or the prefabricated kitchen 8 can be fixedly connected with the cast-in-situ wall 2 on the same floor.

When the wall unit used to connect with the adjacent structural wall of the prefabricated bathroom 7 or prefabricated kitchen 8 is a full prefabricated wall, the wall unit is provided with a connecting hole located in the lower wall and communicates with the connecting hole The grouting hole provided on the wall, the connecting hole is connected with the connecting hole provided on the adjacent lower wall, and inserted into the connecting hole of the prefabricated bathroom 7 or prefabricated kitchen 8 and the connecting hole in the lower wall The upper and lower walls can be fixed together by reinforcing steel bars and pouring mortar.

In the above steps, concrete is pumped from the concrete mixing device to the working floor by a high-pressure pump, and the concrete mixing device is arranged on the bottom surface of the working floor, so that the tower crane can be free to transport other materials to the working floor to improve work efficiency. A hydraulic cantilever needs to be erected on the working floor, and concrete is set on one side for the floor slab and structural transverse walls. The hydraulic cantilever itself rests on a portable steel column unit that is supported over several floors and can be reset upwards as the build progresses. In order to use concrete pumps, the concrete slump needs to be changed from the standard 75mm to 100mm by introducing a higher cement content into the concrete mix, the concrete thus retains its strength but is easier to pump to the working floor.

Said steps A, B, C or D can all be carried out across different wings of the building in one day, thus, it only takes four working days to build a standard floor, which greatly shortens the construction time compared with traditional construction methods. cycle to minimize worker idle time.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (12)

1. A multi-storey building with prefabricated parts, comprising: prefabricated exterior walls (1), cast-in-place walls (2), semi-prefabricated floor slabs (31) and cast-in-place floor slabs (32); it is characterized in that: Also includes prefab stairs (6), prefab bathrooms (7) and prefab kitchens (8); The upper and lower ends of the prefabricated staircase (6) are provided with installation holes (61) for pouring mortar, and the floors connecting the upper and lower ends of the prefabricated staircase (6) are fixed with exposed steel bars, and the exposed steel bars are inserted into the corresponding installation hole (61) and fixed by pouring mortar; The bottoms of the prefabricated bathroom (7) and the prefabricated kitchen (8) are preset with horizontal exposed steel bars, and the horizontal exposed steel bars are interconnected with the steel bars in the cast-in-place floor slab (32). 2. The multi-storey building with prefabricated parts according to claim 1, characterized in that: the upper and lower ends of the prefabricated stairs (6) respectively extend outwards with connecting parts (62), and the said parts for pouring mortar The installation hole (61) is set on the connecting part (62); the end of the floor slab connecting the upper and lower ends of the prefabricated staircase (6) is provided with a concave platform (33) supporting the connecting part (62), and the exposed Reinforcing bar is fixed on concave platform (33) top. 3. The multi-storey building with prefabricated parts according to claim 1 or 2, characterized in that: at least one wall unit of the prefabricated bathroom (7) or prefabricated kitchen (8) has a rough outer surface with alternating concave and convex The semi-prefabricated wall, and the wall unit is integrated with the cast-in-place wall (2) on the same floor. 4. The multi-storey building with prefabricated parts according to claim 1 or 2, characterized in that: at least one wall unit in the prefabricated bathroom (7) is a full prefabricated wall and is provided with a second wall unit located in the lower wall. A grouting channel (71) and a grouting hole (73) communicated with the first grouting channel (71) and provided on the wall surface, the first grouting channel (71) and the second grouting channel provided on the adjacent lower wall The channels (72) are butted, and the first grouting channel (71) and the second grouting channel (72) are inserted with internal steel bars and fixed by pouring mortar. 5. The multi-storey building with prefabricated parts according to claim 1 or 2, characterized in that: at least one wall unit in the prefabricated kitchen (8) is a full prefabricated wall and is provided with a second wall unit located in the lower wall. Three grouting passages (81) and the grouting holes (83) communicated with the third grouting passage (81) and arranged on the wall surface, the third grouting passage (81) and the fourth grouting passage provided on the adjacent lower wall The channels (82) are butted, and the third grouting channel (81) and the fourth grouting channel (82) are inserted with internal steel bars and fixed by pouring mortar. 6. A semi-prefabricated construction method of multi-storey building as claimed in claim 1, characterized in that, the semi-prefabricated construction method comprises the steps of: A． Lay the semi-prefabricated slab (31), and lay reinforcing bars on the semi-prefabricated slab (31); B． Place and fix the prefabricated exterior wall (1), prefabricated bathroom (7) and prefabricated kitchen (8), fasten the steel bars of the load-bearing wall (2) and column (5) and fix the formwork; C． pouring concrete into the template to complete the production of the load-bearing wall (2) and the column (5), and pouring concrete on the semi-prefabricated floor (31) on which steel bars have been laid to complete the production of the floor (3); D． Place and fix the prefabricated staircase (6), complete the installation of the prefabricated staircase (6), and remove the formwork of the load-bearing wall (2) and column (5). 7. The semi-prefabricated construction method of a multi-storey building according to claim 6, characterized in that: in each step, the concrete is pumped from the concrete mixing device to the working floor by a high-pressure pump, and the concrete mixing device is set On the bottom of the working floor. 8. The semi-prefabricated construction method of a multi-storey building according to claim 7, characterized in that: said steps A, B, C or D are carried out across different flanks of the building within one day. 9. The semi-prefabricated construction method of multi-storey buildings according to any one of claims 6 to 8, characterized in that: in the step B, the prefabricated bathroom (7) and the bottom of the prefabricated kitchen (8) are also prefabricated The horizontal exposed steel bars are connected together with the steel bars laid on the semi-prefabricated floor (31); in the step C, at least one wall unit of the prefabricated bathroom (7) is also fixedly connected to the adjacent wall, and the At least one wall unit of the prefabricated kitchen (8) is fixedly connected to an adjacent wall. 10. The semi-prefabricated construction method of a multi-storey building according to claim 9, characterized in that: at least one wall unit of the prefabricated bathroom (7) or prefabricated kitchen (8) is a semi-prefabricated wall, and the step C In the process, the semi-prefabricated wall of the prefabricated bathroom (7) or the prefabricated kitchen (8) is connected with the cast-in-place wall (2) on the same floor as a whole. 11. The semi-prefabricated construction method of a multi-storey building according to claim 9, characterized in that: at least one wall unit of the prefabricated bathroom (7) or prefabricated kitchen (8) is a fully prefabricated wall and is provided with a The connecting hole in the wall and the grouting hole communicated with the connecting hole and arranged on the wall, the connecting hole is docked with the connecting hole provided on the adjacent lower wall, in the step C, in the prefabricated bathroom (7 ) or the connecting hole of the prefabricated kitchen (8) and the connecting hole in the lower wall are inserted into the internal reinforcement and poured with mortar to fix the upper and lower walls together. 12. The semi-prefabricated construction method of multi-storey buildings according to any one of claims 6 to 8, characterized in that: in the step D, the prefabricated floors connected to the upper and lower ends of the prefabricated stairs (6) are prefabricated The exposed steel bars provided are inserted into the installation holes (61) provided at the upper and lower ends of the prefabricated stairs (6), and mortar is poured into the installation holes (61) to connect and fix the prefabricated stairs (6) and the floor.

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