Prefabricated stair and construction method thereof

Abstract

The invention relates to a prefabricated stair and a construction method thereof.The prefabricated stair comprises a prefabricated bottom plate, prefabricated steps and supporting ribs, the prefabricated bottom plate comprises an upper extending section, a lower extending section and a plurality of plate bodies, the prefabricated steps and the prefabricated bottom plate are spliced to form a pouring cavity, a pouring opening is formed in the upper extending section, and the prefabricated steps comprise a plurality of stepping blocks. The prefabricated bottom plate and the prefabricated steps are assembled in a split mode, the weight and the size of a single prefabricated stair component are reduced, the prefabricated stair component can be carried to an installation site manually or through a cart, carrying and construction are convenient, the construction efficiency can be improved, hoisting is not needed for installation, the hoisting cost is reduced, and therefore the construction cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of stairs, and in particular to a prefabricated staircase and a construction method thereof. Background Art

[0002] Prefabricated and assembled buildings have become a development trend in modern building structures due to their simple construction, short construction period, low environmental pollution, and labor saving. Among them, prefabricated stairs have been widely used in the field of prefabricated buildings due to their high degree of standardization, low production difficulty, and easy construction and installation.

[0003] At present, the weight of a single section of prefabricated stair components used in engineering practice is usually 800-2000kg, and they need to rely on large-scale lifting equipment such as tower cranes and truck cranes for installation. However, in narrow sites (such as old building renovation sites, building clusters in urban core areas, and indoor stair replacement scenarios), there is insufficient space for lifting operations (no lifting holes or limited lifting radius), making it difficult for lifting equipment to enter the site or expand the operating radius, resulting in low lifting efficiency and high construction costs, which needs to be improved. Summary of the Invention

[0004] In order to improve the problem of insufficient hoisting space when installing prefabricated stairs in a narrow site, difficulty in entering the site or expanding the operating radius of hoisting equipment, resulting in low hoisting efficiency and high construction costs, the present application provides a prefabricated staircase and its construction method.

[0005] In a first aspect, the present application provides a prefabricated staircase, which adopts the following technical solution:

[0006] A prefabricated staircase comprises a prefabricated base plate, prefabricated steps and supporting ribs, wherein the prefabricated base plate comprises an upper extension section, a lower extension section and a plurality of plates, wherein the plurality of plates are located between the upper extension section and the lower extension section, wherein a first dovetail block is provided on the plate, and a first dovetail groove is provided on a side of the plate away from the first dovetail block for the first dovetail block to be snapped into, wherein a second dovetail groove is provided on the upper extension section for the first dovetail block to be snapped into, and wherein a second dovetail block is provided on the lower extension section, and wherein the first dovetail groove is provided for the second dovetail block to be snapped into;

[0007] The prefabricated step is located above the prefabricated base plate, a pouring cavity is formed between the prefabricated step and the prefabricated base plate, a pouring port is opened on the upper extension section, and the pouring port is connected to the pouring cavity, the prefabricated step includes a plurality of step blocks, a rectangular steel frame 1 and an L-shaped steel bar are respectively provided on both sides of the step block, the rectangular steel frame 1 and the L-shaped steel bar are both located in the pouring cavity, the rectangular steel frame 1 and the step block are spliced ​​to form a through hole for the L-shaped steel bar to pass through, and the L-shaped steel bar is used to hook the rectangular steel frame 1 on the adjacent step block;

[0008] An L-shaped steel bar frame is provided on the upper extension section, and a slot for the first rectangular steel bar frame to be inserted into is formed between the L-shaped steel bar frame and the upper extension section. A second rectangular steel bar frame is provided on the step block, and a third rectangular steel bar frame is provided on the plate body. The third rectangular steel bar frame and the second rectangular steel bar frame are both located in the perfusion cavity, and the first rectangular steel bar frame, the second rectangular steel bar frame and the third rectangular steel bar frame are spliced ​​to form a through hole for the support rib to pass through.

[0009] A sealing plate is provided on the step block at the lower end, the perfusion cavity is for the sealing plate to be inserted into, the sealing plate is used to block the outlet of the perfusion cavity, and the lower extension section abuts against the lower end of the sealing plate.

[0010] By adopting the above technical solution, when assembling the prefabricated staircase, the dovetail block 1 is inserted into the dovetail groove 2 and the dovetail block 1 is inserted into the dovetail groove 1 to achieve the splicing of the upper extension section and each plate body, and then the upper extension section is installed and fixed in the designated position;

[0011] Then, the step blocks are placed so that the rectangular reinforcement frame 1 on the step blocks is snapped into the slot, and the step blocks are limited by the L-shaped reinforcement frame abutting the rectangular reinforcement frame 1. Then, each step block is placed in sequence so that the L-shaped steel bars pass through the through holes on the adjacent step blocks, and then the L-shaped steel bars are bent with the help of a tool so that the parts that pass through the through holes are hooked on the rectangular reinforcement frame 1 on the adjacent step blocks to achieve the connection of the adjacent step blocks. Then, the supporting ribs are passed through the through holes, and the supporting ribs abut the rectangular reinforcement frame 1, the rectangular reinforcement frame 2, and the rectangular reinforcement frame 3 to achieve the limitation between the adjacent step blocks, between the adjacent plate bodies, and between the plate body and the step blocks, and the plate body and the step blocks are connected. After the subsequent pouring of concrete, the structural strength of the entire prefabricated staircase can be enhanced.

[0012] Then the closing plate is inserted into the pouring cavity on the step block at the lower end to seal the outlet of the pouring cavity, the closing plate abuts the lower end of the supporting rib to limit the supporting rib, and then the second dovetail block is inserted into the first dovetail groove, so that the lower extension section abuts the lower end of the closing plate to limit the closing plate, and then concrete is poured into the pouring port until the concrete fills the pouring cavity, and the construction of the prefabricated stairs is completed. The prefabricated base plate and prefabricated steps are both assembled in a split manner, which reduces the weight and volume of a single prefabricated stair component. It can be transported to the installation site by hand or with a cart, which is convenient for transportation and construction, and is conducive to improving construction efficiency. There is no need for hoisting for installation, which reduces hoisting costs and thus reduces construction costs.

[0013] Optionally, the second rectangular steel bar frame and the third rectangular steel bar frame correspond one to one, and the second rectangular steel bar frame abuts against a side of the corresponding third rectangular steel bar frame close to the upper extension section.

[0014] By adopting the above technical solution, rectangular steel frame three abuts rectangular steel frame two to form multi-point support for the prefabricated steps, thereby improving the overall structural stability of the prefabricated stairs.

[0015] Optionally, a limiting surface is provided on the lower extension section, and the limiting surface is used to abut against the side of the sealing plate away from the step block.

[0016] By adopting the above technical solution, a limiting surface is set. After the concrete is poured, the limiting surface abuts against the sealing plate to limit the sealing plate, thereby reducing the situation where the sealing plate is pushed away from the step block under the action of the gravity of the concrete, making the surface of the prefabricated stairs smoother.

[0017] Optionally, a limiting block is provided on the plate body, and a limiting groove for the limiting block to be inserted into is opened on the step block.

[0018] By adopting the above technical solution, the limiting block and the inner wall of the limiting groove are offset against each other to achieve the limiting between the step block and the plate body. There is no need to manually adjust the relative position between the second rectangular steel frame and the third rectangular steel frame, which facilitates the subsequent penetration and perforation of the supporting reinforcement bars. It can also transmit horizontal loads (such as lateral impact and seismic force) and reduce stress concentration.

[0019] Optionally, the L-shaped steel bar is a Q235 steel bar with a diameter of 6-8 mm.

[0020] By adopting the above technical solution, the L-shaped steel bar can be bent with the help of conventional tools such as pliers, and after bending, it still has a certain strength to connect adjacent step blocks.

[0021] In a second aspect, the present application provides a construction method for prefabricated stairs, which adopts the following technical solution:

[0022] A construction method of the above-mentioned prefabricated stairs comprises the following steps:

[0023] S1. Insert dovetail block 1 into dovetail groove 2, then insert dovetail block 1 on each plate into dovetail groove 1 on the adjacent plate to achieve the splicing of the upper extension section and each plate, and then fix the upper extension section in the designated position;

[0024] S2. Place the first step block on the plate body, and make the rectangular steel frame 1 on the step block snap into the slot to limit the first step block, continue to place the remaining step blocks on the plate body in sequence, and make the L-shaped steel bar on the upper step block pass through the through hole on the adjacent step block below, use a tool to bend the part of the L-shaped steel bar that passes through the through hole upward, so that the L-shaped steel bar hooks the rectangular steel frame 1 on the adjacent step block, thereby connecting the adjacent step blocks;

[0025] S3, perforating the supporting ribs;

[0026] S4. Insert the sealing plate into the perfusion cavity on the step block at the lower end to block the outlet of the perfusion cavity, then insert the second dovetail block into the first dovetail groove so that the lower extension section abuts the lower end of the sealing plate, and then fix the lower extension section;

[0027] S5. Pour concrete into the pouring port until the concrete fills the pouring cavity and smooth the concrete at the pouring port.

[0028] By adopting the above technical solution, transportation is convenient and no lifting is required, which improves construction efficiency and reduces construction costs.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. The prefabricated base plate and prefabricated steps are assembled separately, which reduces the weight and volume of a single prefabricated staircase component. They can be transported to the installation site manually or by cart, making them easy to transport and install, which is conducive to improving construction efficiency. There is no need for hoisting for installation, which reduces hoisting costs and thus construction costs.

[0031] 2. The rectangular steel frame 3 is abutted against the rectangular steel frame 2 to form a multi-point support for the prefabricated steps, thereby improving the overall structural stability of the prefabricated stairs;

[0032] 3. The limit blocks and the inner wall of the limit grooves are used to offset each other to achieve the limit between the step blocks and the plate body, which is convenient for the subsequent penetration of the support ribs, and can also transfer horizontal loads and reduce stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is an overall schematic diagram of an embodiment of the present application.

[0034] Figure 2 This is a cross-sectional view of an embodiment of the present application.

[0035] Figure 3 for Figure 2 The enlarged view of part A in the middle mainly shows the positional relationship between rectangular reinforcement frame 2 and rectangular reinforcement frame 3.

[0036] Figure 4 This is a partial structural diagram of an embodiment of the present application, mainly showing the structure of the L-shaped steel frame and the slot.

[0037] Figure 5 for Figure 2 The enlarged view of part B in the middle mainly shows the structure of dovetail block 2 and the limiting surface.

[0038] Figure 6 This is a partial exploded structural diagram of an embodiment of the present application when the L-shaped steel bar is not bent, mainly showing the structure of the limiting block and the limiting groove.

[0039] Figure 7This is a structural diagram of an embodiment of the present application partially cut from the middle, mainly showing the matching relationship between the rectangular steel frame 1 and the L-shaped steel bar.

[0040] Figure 8 This is a partial structural diagram of an embodiment of the present application, mainly showing the perforated structure.

[0041] Explanation of the accompanying reference numerals: 1. Prefabricated base plate; 11. Upper extension section; 111. Dovetail groove 2; 112. Pouring port; 12. Lower extension section; 13. Plate body; 131. Dovetail groove 1; 2. Prefabricated step; 21. Step block; 211. Limiting groove; 212. Embedded groove; 3. Support rib; 4. Dovetail block 1; 5. Dovetail block 2; 6. Pouring cavity; 7. Limiting block; 8. Rectangular steel frame 1; 9. L-shaped steel bar; 10. Through hole; 14. L-shaped steel frame; 15. Slot; 16. Rectangular steel frame 2; 17. Rectangular steel frame 3; 18. Perforation; 19. Closing plate; 20. Limiting surface. DETAILED DESCRIPTION

[0042] The following is combined with Figures 1-8 This application is described in further detail.

[0043] The present application embodiment discloses a prefabricated staircase. Figure 1-Figure 5 The prefabricated staircase includes a prefabricated base plate 1, prefabricated steps 2 and supporting ribs 3. The prefabricated base plate 1 includes an upper extension section 11, a lower extension section 12 and a plurality of plates 13. The upper extension section 11 is located above the lower extension section 12. The plurality of plates 13 are located between the upper extension section 11 and the lower extension section 12 and are distributed along the connecting line of the upper extension section 11 and the lower extension section 12. A dovetail block 4 is fixed at one end of the plate 13, and a dovetail groove 13 is opened on the side of the plate 13 away from the dovetail block 4. 1. A dovetail groove 131 extends horizontally through the plate body 13, and the dovetail block 4 is inserted into the dovetail groove 131. A dovetail groove 2 111 is provided on the side of the upper extension section 11 close to the plate body 13, and the dovetail block 4 is inserted into the dovetail groove 111. The dovetail groove 2 111 extends horizontally through the upper extension section 11, and a pouring port 112 is provided on the upper end surface of the upper extension section 11. A dovetail block 2 5 is fixed to the side of the lower extension section 12 close to the plate body 13, and the dovetail groove 131 is provided for the dovetail block 2 5 to be inserted into the dovetail groove 131.

[0044] See also Figures 1-6The prefabricated step 2 is located above the prefabricated base plate 1 and between the upper extension section 11 and the lower extension section 12. A perfusion cavity 6 is formed between the prefabricated step 2 and the prefabricated base plate 1. The perfusion cavity 6 is connected to the perfusion port 112. The prefabricated step 2 includes a plurality of step blocks 21. The plurality of step blocks 21 are distributed along the distribution direction of the plate body 13, and the number and position of the step blocks 21 correspond to the number and position of the plate body 13. A limit block 7 is integrally fixed above each plate body 13. A limit groove 211 is provided on the step block 21 for the limit block 7 to be engaged, and the limit groove 211 is connected to the perfusion cavity 6.

[0045] See also Figures 1-6 Each step block 21 is provided with a groove 212 on one side away from the upper extension section 11 for inserting the adjacent step block 21 , so that the step blocks 21 are arranged in a stepped manner, and the groove 212 constitutes a part of the perfusion cavity 6 .

[0046] See also Figures 1-6 Two rectangular steel frames 8 and L-shaped steel bars 9 are fixed on each step block 21. The rectangular steel frames 8 and L-shaped steel bars 9 are both located in the pouring cavity 6. The two rectangular steel frames 8 are located on the side of the step block 21 close to the upper extension section 11 and are respectively located on both sides of the pouring cavity 6. The two rectangular steel frames 8 are arranged opposite to each other. Each rectangular steel frame 8 is spliced ​​with the step block 21 to form a through hole 10, and the through hole 10 is for the L-shaped steel bar 9 to pass through.

[0047] See also Figure 1-Figure 7 The two L-shaped steel bars 9 are both located on the side of the step block 21 away from the rectangular steel frame 8 and are located in the embedding groove 212, and the two L-shaped steel bars 9 are arranged at intervals. The positions of the two L-shaped steel bars 9 correspond one to one to the positions of the two rectangular steel frames 8. The L-shaped steel bars 9 are facing away from the rectangular steel frame 8, and the L-shaped steel bars 9 are used to hook the rectangular steel frame 8 on the adjacent step block 21. The L-shaped steel bars 9 are Q235 steel bars with a diameter of 6-8 mm.

[0048] See also Figure 1-Figure 7 An L-shaped steel frame 14 is fixed on the upper extension section 11. The number and position of the L-shaped steel frame 14 correspond one-to-one to the number and position of the rectangular steel frame 8, and the L-shaped steel frame 14 faces the upper extension section 11. Each L-shaped steel frame 14 is spliced ​​with the upper extension section 11 to form a slot 15. The opening of the slot 15 faces upward, and the slot 15 is for the rectangular steel frame 8 to be inserted.

[0049] See also Figures 1-8A rectangular steel frame 2 16 is fixed on each step block 21, and a rectangular steel frame 3 17 is fixed on each plate body 13. The rectangular steel frame 3 17 passes through the limit block 7 on the plate body 13. The rectangular steel frame 3 17 and the rectangular steel frame 2 16 are both located in the pouring cavity 6, and the number and position of the rectangular steel frame 2 16 correspond one-to-one to the number and position of the rectangular steel frame 3 17. Each rectangular steel frame 2 16 abuts against the side of the corresponding rectangular steel frame 3 17 close to the upper extension section 11. The two rectangular steel frames 1 8 and the rectangular steel frame 2 16 on each step block 21 and the rectangular steel frame 3 17 on the corresponding plate body 13 are spliced ​​to form two through-holes 18. The number of support ribs 3 corresponds one-to-one to the number of through-holes 18. The through-holes 18 are used to pass the support ribs 3.

[0050] See also Figures 1-8 A sealing plate 19 is placed on the step block 21 at the lower end, and the perfusion cavity 6 on the step block 21 at the lower end is for the sealing plate 19 to be inserted into. The sealing plate 19 is used to block the outlet of the perfusion cavity 6. The lower extension section 12 abuts the lower end of the sealing plate 19. A limiting surface 20 is formed on the lower extension section 12. The limiting surface 20 is located on the side of the sealing plate 19 away from the upper extension section 11 and is vertically arranged, and the limiting surface 20 is used to abut the side of the sealing plate 19 away from the step block 21.

[0051] The implementation principle of a prefabricated staircase in the embodiment of the present application is as follows:

[0052] When assembling the prefabricated stairs, the dovetail block 14 is inserted into the dovetail groove 2 111 and the dovetail block 14 is inserted into the dovetail groove 1 131 to achieve the splicing of the upper extension section 11 and each plate 13, and then the upper extension section 11 is installed and fixed at the designated position.

[0053] Then, the step block 21 is placed so that the rectangular steel bar frame 18 on the step block 21 is inserted into the slot 15, and the limit block 7 is inserted into the limit slot 211, and the above-mentioned step block 21 is limited by the L-shaped steel bar 14 abutting the rectangular steel bar frame 18. Then, each step block 21 is placed in sequence so that the L-shaped steel bar 9 passes through the through hole 10 on the adjacent step block 21, and then the L-shaped steel bar 9 is bent with the help of a tool to pass through the through hole 10 so that the L-shaped steel bar 9 hooks the rectangular steel bar frame 18 on the adjacent step block 21 to achieve the connection of adjacent step blocks 21. Then, the supporting rib 3 is passed through the through hole 18, and the supporting rib 3 abuts the rectangular steel bar frame 18, the rectangular steel bar frame 2 16, and the rectangular steel bar frame 3 17 to achieve the limitation between adjacent step blocks 21, between adjacent plate bodies 13, and between the plate body 13 and the step block 21, and the plate body 13 and the step block 21 are connected. After the subsequent pouring of concrete, the structural strength of the entire prefabricated staircase can be enhanced.

[0054] Then, the closing plate 19 is inserted into the pouring cavity 6 on the step block 21 at the lower end to block the outlet of the pouring cavity 6. The closing plate 19 abuts the lower end of the supporting rib 3 to limit the supporting rib 3. Then, the dovetail block 2 5 is inserted into the dovetail groove 1 131, so that the lower extension section 12 abuts the lower end of the closing plate 19 and the limiting surface 20 abuts the closing plate 19 to limit the closing plate 19. Then, concrete is poured into the pouring port 112 until the concrete fills the pouring cavity 6, and the construction of the prefabricated stairs is completed.

[0055] The prefabricated base plate 1 and the prefabricated steps 2 are both assembled in separate parts, which reduces the weight and volume of a single prefabricated stair component. They can be transported to the installation site manually or by a cart, which is convenient for transportation and construction, and is conducive to improving construction efficiency. There is no need for hoisting for installation, which reduces hoisting costs and thus reduces construction costs.

[0056] The present application also discloses a method for constructing a prefabricated staircase, comprising the following steps:

[0057] S1. Insert the dovetail block 1 (4) into the dovetail groove 2 (111), and then insert the dovetail block 1 (4) on each plate 13 into the dovetail groove 1 (131) on the adjacent plate 13 to achieve the splicing of the upper extension section 11 and each plate 13. Then, apply concrete to the surface of the upper extension section 11 to fix the upper extension section 11 in the designated position.

[0058] S2. Place the first step block 21 on the plate body 13, and the limiting block 7 on the plate body 13 is inserted into the limiting groove 211 on the step block 21, and the rectangular steel frame 8 on the step block 21 is inserted into the slot 15 to limit the first step block 21, and continue to place the remaining step blocks 21 on the plate body 13 in turn, and the limiting block 7 on the plate body 13 is inserted into the limiting groove 211 on each step block 21 in turn, and the L-shaped steel bar 9 on the upper step block 21 is passed through the through hole 10 on the adjacent step block 21 below, and the part of the L-shaped steel bar 9 passing through the through hole 10 is bent upward with the help of pliers or other tools, so that the L-shaped steel bar 9 hooks the rectangular steel frame 8 on the adjacent step block 21, thereby realizing the connection of the adjacent step blocks 21;

[0059] S3, punching the supporting rib 3 through the holes 18;

[0060] S4. Bend the L-shaped steel bar 9 on the step block 21 at the lower end upward with the help of a tool such as pliers, until the remaining area in the embedding groove 212 is available for the subsequent insertion of the sealing plate 19. Then, insert the sealing plate 19 into the pouring cavity 6 on the step block 21 at the lower end to block the outlet of the pouring cavity 6. Then, insert the dovetail block 2 5 into the dovetail groove 1 1, so that the lower extension section 12 abuts the lower end of the sealing plate 19 and the limiting surface 20 abuts the side of the sealing plate 19 away from the step block 21. Then, fix the lower extension section 12 by applying concrete to the surface of the lower extension section 12.

[0061] S5. Pour concrete into the pouring port 112 until the concrete fills the pouring cavity 6 and smoothes the concrete at the pouring port 112.

[0062] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A prefabricated staircase, characterized by: The invention comprises a prefabricated bottom plate (1), a prefabricated step (2) and a supporting rib (3), wherein the prefabricated bottom plate (1) comprises an upper extension section (11), a lower extension section (12) and a plurality of plate bodies (13), wherein the plurality of plate bodies (13) are located between the upper extension section (11) and the lower extension section (12), wherein a dovetail block (4) is provided on the plate body (13), and a dovetail groove (131) for the dovetail block (4) to be inserted is provided on a side of the plate body (13) away from the dovetail block (4), wherein the upper extension section (11) is provided with a dovetail groove (111) for the dovetail block (4) to be inserted, and the lower extension section (12) is provided with a dovetail block (5), wherein the dovetail groove (131) is provided for the dovetail block (5) to be inserted; The prefabricated step (2) is located above the prefabricated base plate (1), and a pouring cavity (6) is formed between the prefabricated step (2) and the prefabricated base plate (1). A pouring port (112) is provided on the upper extension section (11), and the pouring port (112) is communicated with the pouring cavity (6). The prefabricated step (2) includes a plurality of step blocks (21), and a rectangular steel frame (8) and an L-shaped steel bar (9) are provided on both sides of the step block (21). The rectangular steel frame (8) and the L-shaped steel bar (9) are both located in the pouring cavity (6). The rectangular steel frame (8) and the step block (21) are spliced ​​to form a through hole (10) for the L-shaped steel bar (9) to pass through. The L-shaped steel bar (9) is used to hook the rectangular steel frame (8) on the adjacent step block (21); The upper extension section (11) is provided with an L-shaped steel bar frame (14), and a slot (15) for the rectangular steel bar frame 1 (8) to be inserted is formed between the L-shaped steel bar frame (14) and the upper extension section (11), a rectangular steel bar frame 2 (16) is provided on the step block (21), and a rectangular steel bar frame 3 (17) is provided on the plate body (13), and the rectangular steel bar frame 3 (17) and the rectangular steel bar frame 2 (16) are both located in the pouring cavity (6), and the rectangular steel bar frame 1 (8), the rectangular steel bar frame 2 (16), and the rectangular steel bar frame 3 (17) are spliced ​​to form a through hole (18) for the support rib (3) to pass through. A sealing plate (19) is provided on the step block (21) at the lower end, the perfusion cavity (6) is provided for the sealing plate (19) to be inserted into, the sealing plate (19) is used to block the outlet of the perfusion cavity (6), and the lower extension section (12) abuts against the lower end of the sealing plate (19).

2. The prefabricated staircase according to claim 1, characterized in that: The second rectangular steel frame (16) and the third rectangular steel frame (17) correspond to each other one by one, and the second rectangular steel frame (16) abuts against a side of the corresponding third rectangular steel frame (17) close to the upper extension section (11).

3. The prefabricated staircase according to claim 1, characterized in that: A limiting surface (20) is provided on the lower extension section (12), and the limiting surface (20) is used to abut against a side of the sealing plate (19) away from the step block (21).

4. The prefabricated staircase according to claim 1, characterized in that: A limiting block (7) is provided on the plate body (13), and a limiting groove (211) for the limiting block (7) to be inserted is provided on the step block (21).

5. The prefabricated staircase according to claim 1, characterized in that: The L-shaped steel bar (9) is a Q235 steel bar with a diameter of 6-8 mm.

6. A construction method for a prefabricated staircase according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Insert the dovetail block 1 (4) into the dovetail groove 2 (111), and then insert the dovetail block 1 (4) on each plate (13) into the dovetail groove 1 (131) on the adjacent plate (13) to achieve the splicing of the upper extension section (11) and each plate (13), and then fix the upper extension section (11) at the designated position; S2, placing the first step block (21) on the plate body (13), and making the rectangular steel frame (8) on the step block (21) be inserted into the card slot (15) to limit the first step block (21), and continue to place the remaining step blocks (21) on the plate body (13) in sequence, and making the L-shaped steel bar (9) on the step block (21) located above pass through the through hole (10) on the adjacent step block (21) located below, and using a tool to bend the part of the L-shaped steel bar (9) passing through the through hole (10) upward, so that the L-shaped steel bar (9) hooks the rectangular steel frame (8) on the adjacent step block (21), thereby realizing the connection of the adjacent step blocks (21); S3, punching holes (18) through the supporting ribs (3); S4, insert the sealing plate (19) into the pouring cavity (6) on the stepping block (21) at the lower end to block the outlet of the pouring cavity (6), then insert the second dovetail block (5) into the first dovetail groove (131), so that the lower extension section (12) abuts against the lower end of the sealing plate (19), and then fix the lower extension section (12); S5. Pour concrete into the pouring port (112) until the concrete fills the pouring cavity (6), and smooth the concrete at the pouring port (112).

Images