A method for preparing precast concrete stairs

Abstract

This invention discloses a method for preparing a precast concrete staircase, belonging to the field of precast concrete components. It utilizes a corrugated bottom mold to assist in the casting and shaping of the precast staircase. During casting, air is circulated into and de-escalated within the corrugated bottom mold, causing the flexible waterproof fabric at the crest of the mold to repeatedly expand and push upwards. This effectively compresses the concrete, increasing its fluidity and ensuring a dense bond at the bottom. This allows for bottom-up vibration of the concrete. Simultaneously, a vibrator is used to vibrate the concrete from top to bottom, effectively improving the overall density of the concrete. Without affecting the concrete's forming, a densely filled precast staircase is obtained. Furthermore, by adding a guide tube to change the main outflow direction of the gas, the degree of protrusion of the flexible waterproof fabric in different areas is alternately varied, further improving the vibration range and effect on the concrete.

Description

Technical Field

[0001] This invention relates to the field of precast concrete components, and more specifically, to a method for preparing a precast concrete staircase. Background Technology

[0002] Compared with cast-in-place concrete, precast concrete components produced in factories have many advantages:

[0003] I. Safety: For construction workers, the relatively stable working environment in a factory is safer than the complex work on a construction site. II. Quality: The quality and craftsmanship of building components can be better controlled through mechanized production. III. Speed: The standardization of the size and characteristics of prefabricated components can significantly accelerate the installation speed and the progress of construction projects. IV. Cost: Compared with traditional on-site molding, molds in the factory can be reused, resulting in lower overall costs. Mechanized production requires less manpower, and as labor costs continue to rise, the cost advantage of large-scale prefabricated components will become increasingly apparent. V. Environment: The amount of on-site work on construction sites using prefabricated components is significantly reduced, and dust and noise pollution are significantly reduced.

[0004] When precast concrete components are poured, they need to go through processes such as pouring, vibration, molding, and curing. During the pouring and molding process, existing technology generally uses vibrators for vibration. However, for thicker precast stairs, the vibration effect of the vibrator on the concrete in the upper area is significantly better than that on the concrete in the lower area. This can easily result in poor compaction of the concrete in the lower area. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] To address the problems existing in the prior art, the present invention aims to provide a method for preparing a precast concrete staircase. This method utilizes a corrugated bottom mold to assist in the casting and shaping of the precast staircase. During the casting process, air is circulated into and de-escalated within the corrugated bottom mold, causing the flexible waterproof fabric at the crest of the mold to repeatedly expand and push upwards. This effectively compresses the concrete, increasing its fluidity and ensuring a dense bond at the bottom. This allows for bottom-up vibration of the concrete. Simultaneously, a vibrator is used to vibrate the concrete from top to bottom, effectively improving the overall density of the concrete. Without affecting the concrete's forming process, a densely filled precast staircase is obtained. Furthermore, by adding a guide tube to change the main outflow direction of the gas, the degree of protrusion of the flexible waterproof fabric in different areas is alternately varied, further improving the vibration range and effect on the concrete.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] A method for preparing a precast concrete staircase includes the following steps:

[0010] S1. Those skilled in the art first install the inverted mold: install a pair of side templates on both sides of the corrugated bottom mold with bolts;

[0011] S2. Install the reinforcing bars in the inverted mold;

[0012] S3. Pour the mixed concrete into the inverted mold, and circulate and extract air into the corrugated bottom mold to vibrate the concrete from bottom to top.

[0013] S4. At the same time, the concrete is vibrated from top to bottom using a vibrator.

[0014] S5. After initial vibration, stop gas filling and extraction. After a period of time, slowly extract the inside of the corrugated bottom mold to form a negative pressure. During this process, the vibrator continues to vibrate.

[0015] S6. Using hoisting equipment, place the cover plate on top of the concrete from top to bottom, and add concrete to some areas. Let it stand for a period of time to allow the concrete to set initially.

[0016] S7. After initial shaping, remove the cover plate and let it stand for a period of time to continue shaping. Then, carry out curing and demolding to obtain the final precast concrete staircase.

[0017] Furthermore, the inner bottom surface of the wave-shaped bottom mold has multiple grooves, the inner wall of the grooves is fixedly connected to a striped plate, and a flexible waterproof cloth is provided on the striped plate. The inner bottom surface of the wave-shaped bottom mold is wavy, and the multiple grooves are respectively set at multiple wave crest positions.

[0018] Furthermore, the interior of the wave-shaped bottom mold is provided with an air-gathering cavity, and the upper inner wall of the air-gathering cavity is provided with a plurality of main air holes corresponding one-to-one with the grooves. The grooves are connected to the air-gathering cavity through the main air holes. A pair of air pipes are fixedly connected to the outer end of the wave-shaped bottom mold, and the air pipes penetrate the interior of the wave-shaped bottom mold and communicate with the air-gathering cavity.

[0019] Furthermore, the upper inner wall of the air collection cavity is provided with multiple secondary air guide holes, the upper inner wall of the secondary air guide holes is provided with perforations, and a perforated sliding plate is slidably connected inside the secondary air guide holes. One pair of sides of the flexible waterproof cloth passes through the interior of a pair of perforations and is fixedly connected to the upper end of the perforated sliding plate. The other pair of sides of the flexible waterproof cloth are fixedly connected to the inner wall of the groove.

[0020] Furthermore, the striped plate includes multiple mesh strips and multiple solid strips, which are spaced apart. The flexible waterproof fabric is slidably connected between adjacent mesh strips and solid strips, with the mesh strips located on the inner side of the flexible waterproof fabric and the solid strips located on the outer side of the flexible waterproof fabric.

[0021] Furthermore, the mesh strip has a mesh structure, the solid strip has a solid structure, and the ends of the mesh strip and the solid strip that are close to each other are fixedly connected to a main sealing gasket, and the flexible waterproof cloth and the main sealing gasket are in a surface contact sealing state.

[0022] Furthermore, the width of the perforated slide plate is greater than the width of the perforated groove, and a secondary sealing gasket is fixedly connected to the inner wall of the perforation, while the flexible waterproof cloth is slidably connected to the inside of the secondary sealing gasket.

[0023] Furthermore, a guide tube is provided on the inner side of the groove. The guide tube is located on the inner side of the striped plate. The guide tube includes a top frame. A flexible cloth tube is fixedly connected between the top frame and the inner wall of the groove. The flexible cloth tube is located on the outer side of the slot of the main air hole. A magnetic plate is fixedly connected to the inner wall of the top frame.

[0024] Furthermore, a slider is fixedly connected to each of the two sides of the top frame, and a groove is provided on each of the two inner walls of the groove, with the slider slidably connected inside the groove.

[0025] Furthermore, the side template has multiple evenly distributed reinforcing bar holes, and a guideline is engraved on one end of the side template near the corrugated bottom mold.

[0026] 3. Beneficial effects

[0027] Compared with the prior art, the advantages of this invention are:

[0028] (1) This scheme introduces a corrugated bottom mold to assist in the casting and forming of the precast staircase. During the casting process, by cyclically inflating and deflating the corrugated bottom mold, the flexible waterproof cloth at the crest of the corrugated bottom mold is repeatedly expanded and pushed upward, which effectively squeezes the concrete and increases its fluidity, making the bottom area of ​​the concrete densely bonded, and realizing the vibration of the concrete from bottom to top. At the same time, the concrete is vibrated from top to bottom with a vibrator, which effectively improves the overall density of the concrete. Without affecting the concrete forming, a densely filled precast staircase is obtained.

[0029] (2) When air is injected into the air chamber, the gas disperses into the main air hole and the secondary air hole. On the one hand, the gas entering the main air hole gathers in the groove, which gradually increases the internal air pressure, thereby forcing the flexible waterproof cloth to push upward and driving the perforated slide plate to move upward along the secondary air hole. On the other hand, the gas entering the secondary air hole has an airflow thrust on the perforated slide plate, which further assists the perforated slide plate to move upward, making it easier for the flexible waterproof cloth to expand and push out. When the air is pumped out, the air pressure inside the groove decreases, and the flexible waterproof cloth begins to collapse and its volume decreases. Through the repeated expansion and pushing out operation of the flexible waterproof cloth, the concrete is effectively squeezed and its fluidity is increased.

[0030] (3) By using mesh strips and solid strips to partially limit the flexible waterproof fabric, the entire flexible waterproof fabric is divided into multiple expansion areas, breaking it down into smaller parts, which effectively improves the vibration range and vibration effect of the concrete.

[0031] (4) By adding a guide tube, during the process of circulating air inflation and deflation when pouring concrete, an external magnetic field can be added. Through the magnetic force of the external magnetic field on the magnetic plate, the entire guide tube moves back and forth along the chute. The gas entering the main air hole flows out through the guide tube. Most of the gas will enter the flexible waterproof cloth in the corresponding part directly, and a small part of the gas will enter the groove and disperse into the flexible waterproof cloth in other parts. As a result, the degree of protrusion of the flexible waterproof cloth opposite to the guide tube is greater than that of the flexible waterproof cloth in other parts. When the position of the guide tube changes, the corresponding flexible waterproof cloth also changes continuously, so that the degree of protrusion of each flexible waterproof cloth changes in turn. Compared with the embodiment, the flexible waterproof cloth in each area has a similar degree of protrusion expansion. This embodiment further improves the vibration range and vibration effect of concrete. Attached Figure Description

[0032] Figure 1 This is a flowchart of the present invention;

[0033] Figure 2 This is a side view of the prefabricated staircase prepared according to the present invention;

[0034] Figure 3 The three-dimensional form of the inverted mold of the present invention Figure 1 ;

[0035] Figure 4 The three-dimensional form of the inverted mold of the present invention Figure 2 ;

[0036] Figure 5 This is a perspective view of the waveform base mold of the present invention;

[0037] Figure 6 This is a schematic diagram of the side structure of the waveform bottom mold of the present invention;

[0038] Figure 7 for Figure 6 Schematic diagram of the structure at point A;

[0039] Figure 8 This is a schematic diagram of the top surface structure of the striped plate of the present invention;

[0040] Figure 9 This is a schematic diagram of the flexible waterproof fabric structure after adding a flow guide tube in Embodiment 2 of the present invention. Figure 1 ;

[0041] Figure 10 This is a schematic diagram of the flexible waterproof fabric structure after adding a flow guide tube in Embodiment 2 of the present invention. Figure 2 ;

[0042] Figure 11 This is a perspective view of the guide tube of the present invention;

[0043] Figure 12 This is a schematic diagram of the flexible waterproof fabric structure of the present invention during air extraction. Figure 1 ;

[0044] Figure 13 This is a schematic diagram of the flexible waterproof fabric structure of the present invention during air extraction. Figure 2 .

[0045] Explanation of the labels in the diagram:

[0046] 1. Waveform bottom mold, 101. Air collection cavity, 102. Main air hole, 103. Groove, 104. Secondary air guide hole, 105. Perforation, 2. Side template, 201. Rebar hole, 202. Guide line, 3. Bolt, 4. Cover plate, 5. Air pipe, 6. Flexible waterproof cloth, 7. Striped plate, 71. Mesh strip, 72. Solid strip, 8. Perforated slide plate, 9. Guide tube, 91. Top frame, 92. Flexible cloth tube, 93. Magnetic guide plate, 94. Slider. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0048] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] Example 1:

[0051] Please see Figure 1 A method for preparing a precast concrete staircase includes the following steps:

[0052] S1. Those skilled in the art first install the inverted mold: Install a pair of side templates 2 onto both ends of the corrugated bottom mold 1 using bolts 3, such as... Figure 3 and Figure 4 As shown, both ends of the wave-shaped bottom mold 1 are provided with threaded grooves, and the side mold plate 2 is provided with corresponding threaded holes. The bolts 3 pass through the threaded holes and are tightened inside the threaded grooves.

[0053] S2. Install the reinforcing bars in the inverted mold;

[0054] The side formwork 2 has multiple evenly distributed rebar holes 201. Rebars can be inserted into the corresponding rebar holes 201 of a pair of side formwork 2. The specific position of the rebar holes 201 can be set according to actual needs.

[0055] S3. Pour the mixed concrete into the inverted mold, and circulate and extract air into the corrugated bottom mold 1 to achieve vibration of the concrete from bottom to top.

[0056] S4. At the same time, the concrete is vibrated from top to bottom using a vibrator.

[0057] S5. After initial vibration, stop gas filling and extraction. After a period of time, slowly extract the inside of the waveform bottom mold 1 to form a negative pressure. During this process, the vibrator continues to vibrate.

[0058] S6. Using hoisting equipment, place the cover plate 4 on the top of the concrete from top to bottom, and add concrete to some areas. Let it stand for a period of time to preliminarily shape the concrete. Note: Before using the corrugated bottom mold 1, side mold 2 and cover plate 4, a release agent must be evenly applied to their inner surfaces to facilitate normal demolding of the model. This is a routine operation that must be performed by those skilled in the art.

[0059] The side template 2 has a guideline 202 engraved on one end near the wave-shaped bottom mold 1. The guideline 202 is used to position the cover plate 4. When the upper end of the cover plate 4 is flush with the guideline 202, the movement of the cover plate 4 can be stopped.

[0060] S7. After initial shaping, remove cover plate 4 and allow it to stand for a period of time to solidify. Then, perform curing and demolding to obtain the final precast concrete staircase, as shown below. Figure 2 As shown.

[0061] Please see Figure 5 , Figure 6 and Figure 7 The inner bottom surface of the corrugated bottom mold 1 has multiple grooves 103. A striped plate 7 is fixedly connected to the inner wall of each groove 103. A flexible waterproof fabric 6 is provided on the striped plate 7. The inner bottom surface of the corrugated bottom mold 1 is wavy, and the multiple grooves 103 are respectively located at multiple crest positions. Compared with the prior art, this invention adds a flexible waterproof fabric 6 and a striped plate 7 at the crest positions of the corrugated bottom mold 1. During the precast staircase forming process, the concrete portion formed in the area of ​​the flexible waterproof fabric 6 and the striped plate 7 exhibits a certain curvature. Figure 1 It can be seen that the crest position of the inner bottom surface of the corrugated bottom mold 1 corresponds to the trough position of the precast staircase, that is, the concrete in the area where the flexible waterproof cloth 6 and the striped plate 7 are located corresponds to the trough position after the concrete is formed. Figure 2 The position indicated by "n" on the precast staircase is recessed and therefore unlikely to affect the normal use of the precast staircase. Therefore, without affecting the forming of the precast staircase, the present invention introduces a flexible waterproof cloth 6 and a striped plate 7 on the corrugated bottom mold 1 to assist the vibration process of the precast staircase.

[0062] Please see Figure 6 and Figure 7 The corrugated bottom mold 1 has an air collection chamber 101 inside. The upper inner wall of the air collection chamber 101 has a plurality of main air holes 102 corresponding to the grooves 103. The grooves 103 are connected to the air collection chamber 101 through the main air holes 102. A pair of air pipes 5 are fixedly connected to the outer end of the corrugated bottom mold 1. The air pipes 5 penetrate the interior of the corrugated bottom mold 1 and communicate with the air collection chamber 101. In step S3, one air pipe 5 is connected to the inflation device and the other air pipe 5 is connected to the extraction device. The inflation device and the extraction device are started intermittently to realize the cyclic inflation and extraction operation of the air collection chamber 101.

[0063] Please see Figure 6 and Figure 7 The upper inner wall of the air collection chamber 101 is also provided with multiple secondary air guide holes 104. The upper inner wall of the secondary air guide holes 104 is provided with perforations 105. A perforated slide plate 8 is slidably connected inside the secondary air guide holes 104. A pair of side ends of the flexible waterproof cloth 6 pass through the interior of a pair of perforations 105 and are fixedly connected to the upper end of the perforated slide plate 8. The other pair of side ends of the flexible waterproof cloth 6 are fixedly connected to the inner wall of the groove 103. The width of the perforated slide plate 8 is greater than the groove width of the perforation 105. A secondary sealing gasket is fixedly connected to the inner wall of the perforation 105. The flexible waterproof cloth 6 is slidably connected to the interior of the secondary sealing gasket. The inner wall of the secondary air guide holes 104 is provided with air holes (not shown in the figure) that communicate with the main air holes 102, so that gas can flow between the two areas and facilitate the up and down movement of the perforated slide plate 8.

[0064] When air is introduced into the air chamber 101, the gas disperses into the main air hole 102 and the secondary air hole 104. On the one hand, the gas entering the main air hole 102 gathers in the groove 103, gradually increasing its internal air pressure, thereby forcing the flexible waterproof cloth 6 to push upward and driving the perforated slide plate 8 to move upward along the secondary air hole 104. On the other hand, the gas entering the secondary air hole 104 has an airflow thrust on the perforated slide plate 8, further assisting the perforated slide plate 8 to move upward, facilitating the expansion and pushing out of the flexible waterproof cloth 6. When air is extracted, the air pressure inside the groove 103 decreases, and the flexible waterproof cloth 6 begins to collapse, reducing its volume. Through the repeated expansion and pushing out operation of the flexible waterproof cloth 6, the concrete is effectively squeezed and its fluidity is increased, making the bottom area of ​​the concrete densely bonded and effectively vibrating the area below the concrete. Combined with the vibration of the upper area of ​​the concrete by the vibrator, the overall density of the concrete is effectively improved.

[0065] In step S5, when gas filling and extraction are stopped, the inflation device is first removed from the air pipe 5. At this time, the air pipe 5 is connected to the outside. Under the weight of the concrete itself, the flexible waterproof cloth 6 is gradually pressed downward and compressed. After a period of time (10-20 minutes is acceptable), the gas in the gas collection chamber 101 is extracted. Under the action of negative pressure, the perforated sliding plate 8 is moved downward, so that the flexible waterproof cloth 6 and the striped plate 7 are further bonded together. Figure 12 and Figure 13 As shown, this ensures the concrete is densely filled, facilitating the molding of the precast stairs.

[0066] Please see Figure 7 and Figure 8The striped plate 7 includes multiple mesh strips 71 and multiple solid strips 72, which are spaced apart. The flexible waterproof fabric 6 is slidably connected between adjacent mesh strips 71 and solid strips 72. The mesh strips 71 are located on the inner side of the flexible waterproof fabric 6, and the solid strips 72 are located on the outer side of the flexible waterproof fabric 6. By partially limiting the flexible waterproof fabric 6 with the mesh strips 71 and solid strips 72, the entire flexible waterproof fabric 6 is divided into multiple expansion areas, which effectively improves the vibration range and vibration effect of the concrete. The mesh strips 71 have a mesh structure, which facilitates the entry of gas into the interior of the flexible waterproof fabric 6 to cause it to expand. The solid strips 72 have a solid structure, and the ends of the mesh strips 71 and solid strips 72 that are close to each other are fixedly connected to a main sealing gasket. The flexible waterproof fabric 6 and the main sealing gasket are in a surface contact sealing state, which makes it difficult for concrete to enter the gap between the mesh strips 71 and solid strips 72.

[0067] Example 2:

[0068] Compared with Example 1, this embodiment adds a guide tube 9, which further increases the vibration range and vibration effect, as detailed below:

[0069] Please see Figure 9 , Figure 10 and Figure 11 The inner side of the groove 103 is also provided with a guide tube 9, which is located inside the striped plate 7. The guide tube 9 includes a top frame 91, and a flexible cloth tube 92 is fixedly connected between the top frame 91 and the inner wall of the groove 103. The flexible cloth tube 92 is located outside the slot of the main air hole 102. A magnetic plate 93 is fixedly connected to the inner wall of the top frame 91. The magnetic plate 93 is made of magnetic material, such as iron. A slider 94 is fixedly connected to a pair of side ends of the top frame 91. A sliding groove is opened on a pair of inner walls of the groove 103. The slider 94 is slidably connected to the inside of the sliding groove, so that the guide tube 9 can change position along the sliding groove.

[0070] By adding the guide cylinder 9, during the concrete pouring process, an external magnetic field can be added during the circulation and extraction of air. The magnetic force of this external magnetic field on the magnetic guide plate 93 will cause the entire guide cylinder 9 to move back and forth along the chute. Figure 9 and Figure 10As shown, the gas entering the main vent 102 flows outward through the guide tube 9. Most of the gas will directly enter the flexible waterproof cloth 6 in the corresponding part, and a small part of the gas will enter the groove 103 and disperse into the flexible waterproof cloth 6 in other parts. This makes the degree of protrusion of the flexible waterproof cloth 6 opposite to the guide tube 9 greater than that of the flexible waterproof cloth 6 in other parts. When the position of the guide tube 9 changes, the corresponding flexible waterproof cloth 6 also changes continuously, so that the degree of protrusion of the flexible waterproof cloth 6 in each area changes in turn. Compared with the flexible waterproof cloth 6 in each area having a similar degree of protrusion expansion in Embodiment 1, this embodiment further improves the vibration range and vibration effect of concrete.

[0071] This invention introduces a corrugated bottom mold 1 to assist in the casting and forming of precast stairs. During the casting process, by cyclically inflating and deflating the corrugated bottom mold 1, the flexible waterproof cloth 6 at the crest of the corrugated bottom mold 1 repeatedly expands and pushes upward, effectively squeezing the concrete and increasing its fluidity. This makes the bottom area of ​​the concrete densely bonded, achieving bottom-up vibration of the concrete. At the same time, combined with the vibration rod, the concrete is vibrated from top to bottom, effectively improving the overall density of the concrete. Without affecting the concrete forming, a densely filled precast stairs are obtained.

[0072] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto; any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing a precast concrete staircase, characterized in that: Includes the following steps: S1. Install the inverted mold: Install a pair of side templates (2) on both sides of the corrugated bottom mold (1) with bolts (3); S2. Install the reinforcing bars into the inverted mold; S3. Pour the mixed concrete into the inverted mold, and circulate and extract the gas into the corrugated bottom mold (1) to vibrate the concrete from bottom to top. S4. At the same time, the concrete is vibrated from top to bottom using a vibrator. S5. After initial vibration, stop gas filling and extraction. After a period of time, slowly extract the inside of the waveform bottom mold (1) to form a negative pressure. During this process, the vibrator continues to vibrate. S6. Using hoisting equipment, cover the top of the concrete with the cover plate (4) from top to bottom, and add concrete to some areas. Let it stand for a period of time to preliminarily shape the concrete. S7. After initial shaping, remove the cover plate (4), let it stand for a period of time to shape, then carry out curing and demolding to obtain the final precast concrete staircase. The inner bottom surface of the wave-shaped bottom mold (1) is provided with multiple grooves (103), and the inner wall of the grooves (103) is fixedly connected with striped plates (7). The striped plates (7) are provided with flexible waterproof cloth (6). The inner bottom surface of the wave-shaped bottom mold (1) is wavy, and the multiple grooves (103) are respectively set at multiple wave crest positions. The inside of the wave-shaped bottom mold (1) is provided with an air collection cavity (101). The upper inner wall of the air collection cavity (101) is provided with a plurality of main air holes (102) corresponding one-to-one with the groove (103). The groove (103) is connected to the air collection cavity (101) through the main air holes (102). A pair of air pipes (5) are fixedly connected to the outer end of the wave-shaped bottom mold (1). The air pipes (5) penetrate the inside of the wave-shaped bottom mold (1) and communicate with the air collection cavity (101). The upper inner wall of the air collection cavity (101) is also provided with a plurality of secondary air guide holes (104). The upper inner wall of the secondary air guide holes (104) is provided with perforations (105). A perforated slide plate (8) is slidably connected inside the secondary air guide holes (104). A pair of side ends of the flexible waterproof cloth (6) respectively penetrate through a pair of perforations (105) and are fixedly connected to the upper end of the perforated slide plate (8). The other pair of side ends of the flexible waterproof cloth (6) are fixedly connected to the inner wall of the groove (103).

2. The method for preparing a precast concrete staircase according to claim 1, characterized in that: The striped plate (7) includes multiple mesh strips (71) and multiple solid strips (72), which are spaced apart. The flexible waterproof fabric (6) is slidably connected between adjacent mesh strips (71) and solid strips (72). The mesh strips (71) are located on the inner side of the flexible waterproof fabric (6), and the solid strips (72) are located on the outer side of the flexible waterproof fabric (6).

3. The method for preparing a precast concrete staircase according to claim 2, characterized in that: The mesh strip (71) has a mesh structure, the solid strip (72) has a solid structure, and the main sealing gasket is fixedly connected to the end of the mesh strip (71) and the solid strip (72) that are close to each other. The flexible waterproof cloth (6) and the main sealing gasket are in a surface contact sealing state.

4. The method for preparing a precast concrete staircase according to claim 1, characterized in that: The width of the perforated slide plate (8) is greater than the groove width of the perforation (105). The inner wall of the perforation (105) is fixedly connected to a secondary sealing gasket, and the flexible waterproof cloth (6) is slidably connected to the inside of the secondary sealing gasket.

5. The method for preparing a precast concrete staircase according to claim 1, characterized in that: The inner side of the groove (103) is also provided with a flow guide (9). The flow guide (9) is located inside the striped plate (7). The flow guide (9) includes a top frame (91). A flexible cloth tube (92) is fixedly connected between the top frame (91) and the inner wall of the groove (103). The flexible cloth tube (92) is located outside the slot of the main air hole (102). A magnetic plate (93) is fixedly connected to the inner wall of the top frame (91).

6. The method for preparing a precast concrete staircase according to claim 5, characterized in that: The top frame (91) has a pair of side ends fixedly connected to sliders (94), and the groove (103) has a pair of inner walls with sliding grooves. The sliders (94) are slidably connected to the inside of the sliding grooves.

7. The method for preparing a precast concrete staircase according to claim 1, characterized in that: The side template (2) has multiple evenly distributed steel bar holes (201), and the side template (2) has a guide line (202) engraved on one end near the corrugated bottom mold (1).

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