Stair mold and method of use

Abstract

The application relates to the technical field of building molds, and discloses a stair mold and a use method, which comprise a base, the top of two side molds is fixedly connected with cross arms through two inclined insertion holes, a vertical fixing hole for fixing the cross arms is arranged on one end of the side mold close to the end mold, a pre-buried connecting hole is arranged on the ladder surface of the step mold close to the end mold, a pre-buried part is arranged in the pre-buried connecting hole, and the circumferential side of the pre-buried part is provided with a bundling surface for fixing a steel reinforcement cage; the position of the pre-buried part is fixed and easily selected, the position of the steel reinforcement cage is limited by the pre-buried part, the pre-installation accuracy of the steel reinforcement cage is improved, and the convenience of steel reinforcement cage splicing and bundling is improved; the cross arms are connected with the pre-buried part through connecting insertion rods to limit the bearing displacement of the pre-buried part; and the influence of vibration on the displacement of the steel reinforcement cage and the pre-buried part is reduced in the vibration process.

Description

Technical Field

[0001] This invention relates to the field of building mold technology, specifically a staircase mold and its usage method. Background Technology

[0002] Prefabricated buildings primarily rely on molds to prefabricate and cure in an off-site environment before being transported to the site for assembly. A steel reinforcement framework is placed inside the building molds to increase strength. Currently, prefabricated staircases mainly have connecting structures at both ends, and the sides of the prefabricated staircases are smooth with no exposed framework. Prefabricated wall panels, on the other hand, have extended frameworks on their sides for assembly. When the framework extends outside the mold, it facilitates clamping by external mechanisms, improving the positioning accuracy of the framework.

[0003] Chinese patent discloses a prefabricated building staircase mold (CN121928664A). This patent uses a positioning structure on the outside of the mold to fix the skeleton, indicating that the skeleton passes through the mold to the outside. For prefabricated stairs that do not require the skeleton to be exposed, it is not practical to achieve fixation by exposing the skeleton.

[0004] Although the frame can be fixed in the mold forming area by means of angle iron or other blocks, the purpose of adding the blocks or angle iron is to fix the frame rather than to reinforce it. In this case, the positive effect of adding the blocks or angle iron on the stairs is limited, and the advantage of the frame in making the stairs lighter is reduced.

[0005] If the reinforcing steel cage is not fixed, the mortar will have good fluidity and many voids in the early stage of pouring and vibration, which can easily lead to cage displacement. Therefore, this technical solution solves this problem by pre-positioning the cage, vibrating, and then slightly supplementing it, while maintaining the original built-in cage foundation and without changing the existing cage processing and filling. Summary of the Invention

[0006] The purpose of this invention is to provide a staircase mold and its usage method. The mold features a fixed and easily selectable position for the embedded parts. By using the embedded parts as a reference to limit the position of the step frame, it is beneficial to improve the accuracy of the pre-installation of the frame, further improve the strength of the embedded parts, and enhance the convenience of frame splicing and binding. Furthermore, the vibration method overcomes the shaking problem by limiting the oblique insertion of the embedded parts and facilitates loading and unloading, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A stair mold includes a base, and two side molds and two end molds on the top of the base are spliced ​​together to form a frame for receiving step molds. The boundaries between the step molds and the side molds and the end molds are sealed with sealant. The tops of the two side molds are fixedly connected to a crossbeam through two oblique insertion holes. A vertical fixing hole for fixing the oblique insertion hole to the crossbeam is opened at the upper end of the side mold near the end mold. The step mold has a pre-embedded connection hole on the stepped surface near the end mold. The axis of the pre-embedded connection hole is perpendicular to the stepped surface. An embedded part is installed in the pre-embedded connection hole. The circumferential side of the embedded part has a binding surface for fixing with the steel reinforcement skeleton. A connecting rod is inserted into the top of the embedded part along its own axis. The connecting rod slides obliquely in the oblique hole connecting the crossbeam.

[0008] As a further embodiment of the present invention: the side of the side mold is provided with a support insertion hole, the support insertion hole is located below the corner wall of the step mold, a support strip is inserted between two axially opposite support insertion holes, the support strip is fixed to the support insertion hole by a plug rod, and the support strip is in contact with the corner of the step mold.

[0009] As a further embodiment of the present invention: the vertical fixing hole and the horizontal oblique insertion hole are connected by a vertical screw.

[0010] As a further embodiment of the present invention: the frame for fixing the embedded part includes a reinforcing frame, a step frame and / or a back frame.

[0011] As a further embodiment of the present invention: the binding surface of the embedded part has a groove or protrusion for supporting the reinforcing bar.

[0012] As a further embodiment of the present invention: the two ends of the step mold are provided with reserved holes, and the end mold has a hole that matches the reserved holes and whose axis is located on the same straight line.

[0013] As a further embodiment of the present invention: the side of the side mold is provided with a plurality of connecting lock holes, the connecting lock holes are located diagonally below the support insertion hole, and a locking rod is inserted into two of the connecting lock holes whose axes are collinear.

[0014] As a further embodiment of the present invention: a protrusion is fixedly connected to the end of the connecting rod, and when the connecting rod is inserted into the embedded part, the protrusion contacts the top surface of the inclined insertion hole connecting crossbeam.

[0015] As a further aspect of the present invention: a method of using a staircase mold, comprising the following steps: S1: Place an embedded part above the step mold, the embedded part is aligned with the embedded connection hole, and fix the embedded part to the end face of the step mold through the other side of the embedded connection hole; S2: Place two side molds in parallel and two end molds in parallel on the end face of the base and fix them with bolts to form a frame structure. Insert support strips into two axially distributed support holes and fix them with insert rods. Align the lower edge of the step mold with the support strips and place it inside the frame and support it with the support strips. Seal the contact surfaces between the step mold and the side molds and end molds with glue. Fix the connecting lock holes with the same axis with locking rods. S3: Process the reinforcing frame and fix the side of the reinforcing frame to the embedded parts. Process the step frame and place the step frame on top of the step mold. Tie the step frame to the reinforcing frame and the embedded parts. At the same time, tie the two ends of the step frame to the end frame. S4: Process the back frame and place it inside the step mold. The back frame is parallel to the step frame. The back frame, reinforcing frame, and embedded parts are all fixed by binding. The two ends of the back frame are bound to the end frame. S5: Vertically fix the oblique insertion hole connecting crossarm and the vertical fixing hole, insert the connecting rod along the oblique hole connecting crossarm, and connect the end of the connecting rod to the end of the embedded part. S6: The pre-drilled hole and the sleeve inserted into the end mold are used to make the ring frame surround the sleeve; S7: Grout and vibrate until the grout is evenly dispersed and compacted. Remove the connecting rod and add grout until the grout surface is flat to complete the grouting operation.

[0016] As a further embodiment of the present invention: steps S2, S3, S4, and S5 are removed, and step S2A is used to replace the three steps. Step S2A: after the reinforcing frame, back frame, and step frame are processed, they are installed into the frame in the order of reinforcing frame-step frame-back frame. The oblique insertion hole connecting crossbeam is vertically fixed to the vertical fixing hole. The connecting rod is inserted along the oblique insertion hole connecting crossbeam. The end of the connecting rod is inserted into the end of the embedded part. Finally, the reinforcing frame, back frame, step frame and embedded part are tied together in sequence. At the same time, the reinforcing frame, back frame, step frame and end frame are tied together with each other.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This technical solution does not add any structure remaining inside the staircase besides the frame. It achieves pre-limitation and vibration-limitation of the internal frame and supplements the strength of the embedded parts. The fixed and easily selectable position of the embedded parts, used as a reference to limit the position of the step frame, improves the accuracy of pre-installation of the frame, further enhances the strength of the embedded parts, and improves the convenience of frame splicing and binding. The oblique insertion hole connecting crossarm not only increases the stability of the side formwork connection, but also limits the load-bearing displacement of the embedded parts through the connecting rod. During vibration, it reduces the displacement impact of vibration on the frame and embedded parts. After vibration compaction, the interior of the frame is tightly filled. Removing the connecting rod at this point will only create a small amount of residual channel, which can be easily filled with mortar. Even with secondary vibration, due to the compacted bottom, frame displacement is still difficult, and any residual channels at the top will gradually recover during vibration. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram showing a skeleton placed inside a staircase mold; Figure 2 A three-dimensional schematic diagram of a staircase mold; Figure 3 This is a side perspective view of a staircase mold; Figure 4 A schematic diagram of a stair frame manufactured using a stair mold; Figure 5 This is a schematic diagram of the connection and assembly of a stair mold, showing the oblique insertion hole connecting the crossbeam and the side mold. Figure 6 A schematic diagram showing the splicing and positioning of the crossarm, embedded parts, and connecting rods for the oblique insertion holes; In the diagram: 1. Base; 2. Side mold; 21. Vertical fixing hole; 22. Support insertion hole; 23. Connecting lock hole; 3. End mold; 4. Step mold; 41. Embedded connecting hole; 42. Reserved hole; 5. Embedded part; 6. Angled insertion hole connecting crossbeam; 7. Support bar; 8. Connecting rod. Detailed Implementation

[0020] Please see Figures 1-6 This embodiment uses a conventional steel reinforcement frame structure inside the staircase; please refer to [link / reference]. Figure 4The ends of the staircase need to be connected and fixed to the mounting surface. Therefore, a frame-type frame is used for the end skeleton. To increase the connection strength between the frame skeleton and the step and back skeletons, reinforcing frames are installed. These reinforcing frames have two ends parallel to the back skeleton, and a triangular shape matching the step in the middle. The reinforcing frames are located at both ends of the staircase near the end skeleton, and they provide secondary binding to the back and step skeletons to improve the connection strength of the end skeleton assemblies. As shown in the attached diagram, the skeleton is not exposed. To avoid mold complexity caused by through-molding the skeleton, embedded parts 5 are commonly used in staircases. Specifically, they are a combination of hanging nail corrugated cups and pin-key embedded parts. Therefore, embedded parts 5 are used as a reference to achieve the positioning and connection of the step and back skeletons. The specific method is as follows: In the prior art, a base 1 is included, and two side molds 2 and two end molds 3 on the top of the base 1 are spliced ​​together to form a frame that houses the step mold 4. The boundary between the step mold 4 and the side molds 2 and end molds 3 is sealed with sealant.

[0021] This technical solution does not change the main structure of the current mold. It mainly uses a frame-shaped structure formed by the side mold 2 and the end mold 3 to house the step mold 4 and form a cavity. The sealing process is a common process in this field, and its purpose is to avoid leakage during vibration and improve the sealing performance.

[0022] The specific improvements are as follows: The tops of the two side molds 2 are fixedly connected to the crossbeams 6 through two oblique insertion holes. A vertical fixing hole 21 for fixing the oblique insertion hole connected to the crossbeam 6 is opened at the upper end of the side mold 2 near the end mold 3. A pre-embedded connection hole 41 is opened on the stepped surface of the step mold 4 near the end mold 3. The axis of the pre-embedded connection hole 41 is perpendicular to the stepped surface. An embedded part 5 is installed in the pre-embedded connection hole 41. The circumferential side of the embedded part 5 has a binding surface for fixing to the steel reinforcement skeleton. A connecting rod 8 is inserted into the top of the embedded part 5 along its own axis. The connecting rod 8 slides obliquely in the oblique hole connected to the crossbeam 6.

[0023] Please see Figure 1 and Figure 3 The inclined insertion hole connecting crossbeam 6 connects the top surfaces of the two side molds 2. There are two inclined insertion hole connecting crossbeams 6, which are located near the end mold 3. The embedded part 5 is fixed to the embedded connection hole 41 by the hanging nail cup glue structure. The fixing structure is located on the bottom surface of the step mold 4 and will not affect the internal molding.

[0024] The step support frame, back frame, and reinforcing frame are all processed using external binding machines or in a processing area. The processed reinforcing frame is located at the bottom and is placed inside the step mold 4 and bound to the embedded part 5. After binding and fixing, the step support frame is placed inside the step mold 4, and the reinforcing frame passes through it. The step support frame is then bound to the embedded part 5 and the reinforcing frame. During this process, if it is necessary to control the gap between the step support frame and the step surface, there are three methods: A: The structural strength of the embedded part 5 will not change when it is affected by the step frame and the angle between the embedded part 5 and the step surface of the step mold 4. At this time, the embedded part 5 can support the gap between the step frame and the step mold 4. Under this condition, the end of the step frame and the end frame can be tied together to achieve composite fixation.

[0025] B: The structural strength of the embedded part 5 will change due to the influence of the step frame and the angle between the embedded part 5 and the step surface of the step mold 4. The end of the embedded part 5 is fixed by the hook to avoid the displacement of the embedded part 5 caused by the gravity of the step frame. Then the end frame and the step frame are tied together to achieve support.

[0026] C: The reinforcing frame is lightweight and fits snugly against the stepped surface. The reinforcing frame is fixed to the embedded part 5. The embedded part 5 is under the influence of gravity and... Figure 3 From this perspective, the reinforcing frame supports the embedded part 5, thereby reducing the impact of the self-weight of the step frame on the embedded part 5.

[0027] Since the position of the embedded part 5 is fixed and easy to select, using the embedded part 5 as a reference to limit the position of the step frame is beneficial to improving the accuracy of the pre-installation of the frame. In addition, the reinforcing frame also plays a positive role in reinforcing the step mold 4 and resisting the weight of the frame.

[0028] Furthermore, after the reinforcing frame and the step support frame provide two-point support for the step mold 4, and the step support frame is connected to the end frame, the weight that the step mold 4 can withstand increases. The back frame is then installed, and support for the back frame is achieved with very few binding points through binding the reinforcing frame and the back frame, and binding the step mold 4 to the back frame. This four-point support provides greater stability. After the back frame is fixed, binding the dense binding points between the end frame and the back frame becomes easier.

[0029] Pre-positioning improves the accuracy of the skeleton. With increased support capacity, the problem of numerous binding points between the step-back skeleton, the back skeleton, and the end skeleton is also resolved. Skeleton positioning can be achieved with very few fixing points, thus allowing sufficient time for construction workers to connect the end skeleton to the step-back and back skeletons. Although the above method provides support for the skeleton with the embedded parts 5, during vibration, the complex bottom space and incomplete filling can easily cause the skeleton to shift during vibration. To solve this problem, oblique insertion holes are used to connect the crossbeams 6.

[0030] The difference between the inclined insertion hole connecting crossarm 6 and existing technologies lies in the fact that the surface of the inclined insertion hole connecting crossarm 6 has an inclined hole that is aligned with the axis of the inclined embedded part 5. The connecting rod 8 is inserted along the inclined hole, and the connecting rod 8 and the embedded part 5 are connected. The embedded part 5, affected by the gravity of the skeleton binding, will change its angle with the stepped surface. The connecting rod 8 is limited by the inclined hole, and the embedded part 5 is limited by the axial insertion of the connecting rod 8, ensuring that the angle between the embedded part 5 and the stepped surface remains unchanged, thus guaranteeing the stability of the embedded part 5 structure. Further explanation: If the skeleton moves along the axial direction of the embedded part 5, the skeleton will inevitably be interfered with by the end skeleton; therefore, the embedded part 5 is unlikely to be displaced by axial force.

[0031] In this technical solution, the inclined insertion hole connecting crossarm 6 not only increases the stability of the side mold 2 connection, but also limits the load-bearing displacement of the embedded part 5 through the connecting rod 8. During vibration, this reduces the impact of vibration on the frame and the embedded part 5's displacement. After vibration compaction, the frame is tightly filled, and removing the connecting rod 8 at this point will only create a small amount of residual channels, which can be easily filled by adding mortar. Even with secondary vibration, the frame displacement is still difficult due to the compacted bottom, and any residual channels at the top will gradually recover during the vibration process.

[0032] Furthermore, the side mold 2 has a support insertion hole 22 on its side. The support insertion hole 22 is located below the corner wall of the step mold 4. A support strip 7 is inserted between two axially opposite support insertion holes 22. The support strip 7 is fixed to the support insertion hole 22 by a rod. The support strip 7 is in contact with the corner of the step mold 4.

[0033] Please see Figure 3 The combination of support strip 7 and support hole 22 fixes the support hole 22 and support strip 7, and also fixes the two side molds 2. The addition of support strip 7 makes the step mold 4 stable, thereby improving the convenience of sealing the step mold 4.

[0034] Furthermore, the vertical fixing hole 21 and the horizontal oblique insertion hole connecting crossarm 6 are fixed by a vertical screw. Since it is difficult for the connecting rod 8 to generate a vertical force between them on the oblique insertion hole connecting crossarm 6, the screws fixing the oblique insertion hole connecting crossarm 6 and the vertical fixing hole 21 are mainly fixed by structural limiting, such as radial force on the pin, to reduce the influence of the force on the thread.

[0035] Furthermore, the binding surface of the embedded part 5 has grooves or protrusions for supporting the reinforcing bars. To avoid relying on friction to fix the skeleton, the binding surface of the embedded part 5 has grooves or protrusions for supporting the reinforcing bars. The reinforcing bars can be inserted into the grooves or two adjacent protrusions, and the stability of the connection is improved by combining structural limiting with binding friction. Moreover, the combination of grooves and reinforcing bars forms a composite force, making it difficult for the embedded part 5 to flip under the influence of vertical gravity.

[0036] The two ends of the step mold 4 are provided with reserved holes 42, and the end mold 3 has a hole that matches the reserved holes 42 and whose axis is on the same straight line. Since the end of the step mold 4 needs to be provided with a hole, the end mold 3 has a matching hole that matches the reserved holes 42. A pipe is inserted into the hole, and after curing, the pipe is demolded to obtain the hole.

[0037] Several connecting lock holes 23 are provided on the side of the side mold 2. The connecting lock holes 23 are located diagonally below the support insertion hole 22. Locking rods are inserted into two connecting lock holes 23 with collinear axes. The connecting lock holes 23 are used to further improve the connection strength between the two side molds 2.

[0038] A protrusion is fixedly connected to the end of the connecting rod 8. When the connecting rod 8 is inserted into the embedded part 5, the protrusion contacts the top surface of the inclined insertion hole connecting crossarm 6. To prevent the end of the connecting rod 8 from entering the hole of the inclined insertion hole connecting crossarm 6, the protrusion prevents the edge of the end of the connecting rod 8 from easily causing wear on the hole of the inclined insertion hole connecting crossarm 6.

[0039] The specific process is as follows: S1: Place the embedded part 5 above the step mold 4, align the embedded part 5 with the embedded connection hole 41, and fix the embedded part 5 to the end face of the step mold 4 through the other side of the embedded connection hole 41. S2: Place two side molds 2 in parallel and two end molds 3 in parallel on the end face of the base 1 and fix them with bolts to form a frame structure. Insert support strips 7 into the two axially distributed support holes 22 and fix them with insert rods. Align the lower edge of the step mold 4 with the support strips 7 and place it inside the frame and support it with the support strips 7. Seal the contact surfaces between the step mold 4 and the side molds 2 and end molds 3 with glue. Fix the connecting lock holes 23 with the same axis with locking rods. S3: Process the reinforcing frame and fix the side of the reinforcing frame to the embedded part 5. Process the step frame and place the step frame above the step mold 4. Tie the step frame to the reinforcing frame and the embedded part 5 and tie the two ends of the step frame to the end frame. S4: Process the back frame and place it inside the step mold 4. The back frame is parallel to the step frame. The back frame, reinforcing frame, and embedded parts 5 are all fixed by binding. The two ends of the back frame are bound to the end frame. S5: Vertically fix the oblique insertion hole connecting crossarm 6 and the vertical fixing hole 21, insert the connecting rod 8 along the oblique hole of the oblique insertion hole connecting crossarm 6, and insert the end of the connecting rod 8 into the end of the embedded part 5. S6: Insert the sleeve into the reserved hole 42 and the end mold 3 so that the ring frame surrounds the sleeve; S7: Grout and vibrate until the grout is evenly dispersed and compacted. Remove the connecting rod 8 and add grout until the grout surface is flat to complete the grouting operation.

[0040] Supplementary explanation: Steps S2, S3, S4, and S5 are removed and replaced by step S2A. Step S2A: After the reinforcing frame, back frame, and step frame are processed, they are installed into the frame in the order of reinforcing frame-step frame-back frame. The oblique insertion hole connecting crossbeam 6 is vertically fixed to the vertical fixing hole 21. The connecting rod 8 is inserted along the oblique hole of the oblique insertion hole connecting crossbeam 6. The end of the connecting rod 8 is inserted into the end of the embedded part 5. Finally, the reinforcing frame, back frame, step frame and embedded part 5 are tied together in sequence. At the same time, the reinforcing frame, back frame, step frame and end frame are tied together with each other.

[0041] Using this method, the step mold 4 is fixed more stably, and the frame is all externally processed, so it does not affect the current process. The above method can also achieve precise fixing.

[0042] If the mesh size of the back frame is too small and interferes with the fixation of the lower frame, you can fix it first according to step S2A. After the step frame is completed, remove the side mold 2 and the oblique insertion hole connecting crossarm 6, add the back frame, and then install the side mold 2 and the oblique insertion hole connecting crossarm 6 to continue binding.

[0043] The above description is merely a preferred embodiment of the present invention, but 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 scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A staircase mold, comprising a base (1), wherein two side molds (2) and two end molds (3) on the top of the base (1) are spliced ​​to form a frame for receiving a step mold (4), wherein the boundaries between the step mold (4) and the side molds (2) and the end molds (3) are sealed with sealant, characterized in that: The tops of the two side molds (2) are fixedly connected to the crossarm (6) through two oblique insertion holes. A vertical fixing hole (21) for fixing the oblique insertion hole to the crossarm (6) is provided at the upper end of the side mold (2) near the end mold (3). The step mold (4) has a pre-embedded connection hole (41) on the stepped surface near the end mold (3). The axis of the pre-embedded connection hole (41) is perpendicular to the stepped surface. An embedded part (5) is installed in the pre-embedded connection hole (41). The circumferential side of the embedded part (5) has a binding surface for fixing with the steel reinforcement skeleton. A connecting rod (8) is inserted into the top of the embedded part (5) along its own axis. The connecting rod (8) slides obliquely in the oblique hole of the oblique insertion hole connecting crossbeam (6).

2. A staircase mold according to claim 1, characterized in that: The side mold (2) has a support insertion hole (22) on its side. The support insertion hole (22) is located below the corner wall of the step mold (4). A support strip (7) is inserted between two axially opposite support insertion holes (22). The support strip (7) is fixed to the support insertion hole (22) by a rod. The support strip (7) is in contact with the corner of the step mold (4).

3. A staircase mold according to claim 1, characterized in that: The vertical fixing hole (21) and the horizontal oblique insertion hole are connected by a crossbeam (6) and fixed by a vertical screw.

4. A staircase mold according to claim 1, characterized in that: The pre-embedded component (5) is fixed to a frame including a reinforcing frame, a step frame, and / or a back frame.

5. A staircase mold according to claim 1, characterized in that: The binding surface of the embedded part (5) has a groove or protrusion for supporting the reinforcing bars.

6. A staircase mold according to claim 1, characterized in that: The step mold (4) has reserved holes (42) at both ends of the stepped mold, and the end mold (3) has a hole that matches the reserved holes (42) and whose axis is on the same straight line.

7. A staircase mold according to claim 2, characterized in that: The side of the side mold (2) has several connecting lock holes (23). The connecting lock holes (23) are located diagonally below the support insertion hole (22). Locking rods are inserted into two connecting lock holes (23) with collinear axes.

8. A staircase mold according to claim 1, characterized in that: The end of the connecting rod (8) is fixedly connected to a protrusion. When the connecting rod (8) is inserted into the embedded part (5), the protrusion contacts the top surface of the inclined insertion hole connecting crossbeam (6).

9. A method of using a staircase mold according to any one of claims 1-8, characterized in that: Includes the following steps: S1: Place an embedded part (5) above the step mold (4), the embedded part (5) is aligned with the embedded connection hole (41), and the embedded part (5) is fixed to the end face of the step mold (4) through the other side of the embedded connection hole (41). S2: Place two side molds (2) in parallel and two end molds (3) in parallel on the end face of the base (1) and fix them with bolts to form a frame structure. Insert support strips (7) into the two axially distributed support holes (22) and fix them with insert rods. Align the lower edge of the step mold (4) with the support strips (7) and place it inside the frame and support it with the support strips (7). Seal the contact surfaces between the step mold (4) and the side molds (2) and end molds (3) with glue. Fix the connecting lock holes (23) with the same axis with locking rods. S3: Process the reinforcing frame and fix the side of the reinforcing frame to the embedded part (5). Process the step frame and place the step frame above the step mold (4). Tie the step frame to the reinforcing frame and the embedded part (5) together. At the same time, tie the two ends of the step frame to the end frame. S4: Process the back frame and place it inside the step mold (4). The back frame is parallel to the step frame. The back frame, reinforcement frame, and embedded parts (5) are all fixed by binding. The two ends of the back frame are bound to the end frame. S5: Fix the oblique insertion hole connecting crossarm (6) vertically to the vertical fixing hole (21), insert the connecting rod (8) along the oblique insertion hole connecting crossarm (6), and insert the end of the connecting rod (8) into the end of the embedded part (5); S6: Insert the sleeve into the reserved hole (42) and the end mold (3) so that the ring frame surrounds the sleeve; S7: Grout and vibrate until the grout is evenly dispersed and compacted. Remove the connecting rod (8) and add grout until the grout surface is flat to complete the grouting operation.

10. The method of using a staircase mold according to claim 9, characterized in that: Steps S2, S3, S4, and S5 are removed, and step S2A is used to replace the three steps. Step S2A: After the reinforcement frame, back frame, and step frame are processed, they are installed into the frame in the order of reinforcement frame-step frame-back frame. The oblique insertion hole connecting crossarm (6) is vertically fixed with the vertical fixing hole (21). The connecting rod (8) is inserted along the oblique insertion hole connecting crossarm (6). The end of the connecting rod (8) is inserted into the end of the embedded part (5). Finally, the reinforcement frame, back frame, step frame and embedded part (5) are tied together in sequence. At the same time, the reinforcement frame, back frame, step frame and end frame are tied together with each other.

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