A prefabricated stair core mold

Abstract

The utility model provides a prefabricated stair core-pulling mould relates to stair core-pulling mould technical field, this prefabricated stair core-pulling mould includes bottom plate, baffle no.

Description

Technical Field

[0001] This utility model relates to the field of stair core-pulling mold technology, specifically a prefabricated stair core-pulling mold. Background Technology

[0002] When manufacturing precast stairs, a core hole can be pre-drilled inside each stair step. The length of the core hole is the same as the width of the stair. The core hole reduces the amount of concrete used, resulting in economic benefits. It also reduces the weight of the stair. Furthermore, the circular cross-section of the core hole ensures the quality of the stair. Currently, the method for manufacturing this type of precast stair with a core hole involves installing steel pipes inside a mold, pouring concrete, and then using vibration to break the connection between the steel pipes and the concrete after the concrete has solidified. The steel pipes are then pulled out of the concrete. However, this method requires vibration of each steel pipe, and the friction between the steel pipes and the concrete core hole is relatively high, making it inconvenient to pull out and failing to meet the usage requirements. Utility Model Content

[0003] The purpose of this utility model is to provide a prefabricated stair core-pulling mold, which aims to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: The prefabricated stair core-pulling mold includes a base plate, on which side plate one, side plate two, side plate three, and side plate four are provided. Side plate one, side plate two, side plate three, and side plate four together with the base plate form a stair forming cavity with an open upper end. Positioning platforms are evenly provided on the base plate. Side plate one is used for forming the stair step part. Side plate one has multiple step surfaces. A fixing plate is provided at the upper end of the step surface. The mold also includes a support plate provided on the fixing plate. A through groove is provided on the support plate. A guide cylinder communicating with the through groove is provided on the support plate. The mold also includes a forming tube. The positioning platform can enter the interior of the forming tube. The forming tube is slidably connected to the guide cylinder. An annular flange extending into the interior of the forming tube is provided at the upper end of the forming tube. An annular baffle is provided inside the forming tube. The mold also includes a plumb rod. A hammer head is provided at the lower end of the plumb rod. The hammer head is located inside the forming tube and between the annular flange and the annular baffle. A handle is provided on the upper side of the plumb rod.

[0005] Preferably, a guide rod is provided between the annular flange and the annular baffle, and a through hole is provided on the hammer head for the guide rod to pass through, wherein the inner diameter of the through hole is larger than the outer diameter of the guide rod.

[0006] Preferably, there are two guide rods arranged symmetrically about the vertical rod.

[0007] Preferably, the upper end of the positioning platform is chamfered.

[0008] Preferably, the positioning platform is made of rubber, and the outer diameter of the positioning platform is slightly larger than the inner diameter of the lower end of the forming tube.

[0009] The beneficial effects of this utility model are:

[0010] This type of precast stair core-pulling mold can continuously push the forming tube out of the concrete by repeatedly striking the annular flange with a hammer before the concrete has fully solidified. Since there is no effective hard connection between the concrete and the forming tube, and the impact of the hammer can promote the upward movement of the forming tube, the forming tube can be easily and quickly pulled out of the concrete, resulting in good performance. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0012] Figure 2 This is an exploded view of the mold.

[0013] Figure 3 This is a structural schematic diagram of a specific embodiment of the present invention.

[0014] In the diagram: 1. Base plate; 2. Side plate one; 3. Side plate two; 4. Side plate three; 5. Side plate four; 6. Positioning platform; 7. Step surface; 8. Fixing plate; 9. Support plate; 10. Guide tube; 11. Forming tube; 12. Annular flange; 13. Annular baffle; 14. Vertical rod; 15. Hammer head; 16. Handle; 17. Guide rod; 18. Staircase. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0016] like Figure 1-3As shown, a prefabricated stair core-pulling mold includes a base plate 1, on which side plates 2, 3, 4, and 5 are provided. These side plates 2, 3, 4, and 5, together with the base plate 1, form a stair 18 forming cavity with an open top. Positioning platforms 6 are evenly distributed on the base plate 1. Side plate 2 is used for forming the steps of the stair 18 and has multiple step surfaces 7. A fixing plate 8 is provided at the upper end of each step surface 7. The mold also includes a support plate 9 mounted on the fixing plate 8, with a through groove on the support plate 9. The upper part is provided with a guide cylinder 10 that communicates with the through groove, and also includes a forming tube 11. The positioning platform 6 can enter the interior of the forming tube 11. The forming tube 11 is slidably connected to the guide cylinder 10. The upper end of the forming tube 11 is provided with an annular flange 12 extending into the interior of the forming tube 11. The interior of the forming tube 11 is provided with an annular baffle 13. It also includes a plumb rod 14. The lower end of the plumb rod 14 is provided with a hammer head 15. The hammer head 15 is located inside the forming tube 11 and between the annular flange 12 and the annular baffle 13. The upper side of the plumb rod 14 is provided with a handle 16.

[0017] The base plate 1, side plate 1, side plate 2, side plate 2, side plate 3, side plate 3, and side plate 4 are all made of steel plates. The thickness of the plates is determined based on the specifications of the stair 18. The larger the stair 18 is, the thicker the plate wall will be. When the width of the stair 18 is 1m, the plate wall thickness is 2mm. At the same time, side plates 1, 2, 3, 4, and 5 need to be reinforced, for example, by adding reinforcing ribs to the surface, to improve their resistance to deformation.

[0018] Both the fixing plate 8 and the support plate 9 are steel plates. The lower end of the fixing plate 8 is provided with a folded edge, which can be used to weld the fixing plate 8 to the side plate 2 by bolts or welding. The folded edge can increase the height of the fixing plate 8, thereby increasing the height of the support plate 9. After the support plate 9 is installed on the fixing plate 8, the support plate 9 will not come into contact with the concrete in the molding cavity, thus preventing the support plate 9 from solidifying with the concrete.

[0019] Both the guide cylinder 10 and the forming tube 11 are steel pipes with a wall thickness of 1mm. The inner diameter of the guide cylinder 10 is 54mm, and the outer diameter of the forming tube 11 is 52mm. First, the annular baffle 13 is welded to the inside of the forming tube 11. After the hammer head 15 is placed in the forming tube 11, the annular flange 12 is then welded to the forming tube 11. The hammer head 15 is made of metal and weighs approximately 0.7kg. The plumb rod 14 is made of rubber or plastic, and the handle 16 is made of plastic. The total weight of the plumb rod 14 and the handle 16 is approximately 0.2kg.

[0020] When preparing the staircase 18, the assembled steel frame is first placed on the base plate 1. Then, side plates 1-2, 2-3, 3-4, and 4-5 are fixed to the base plate 1 with bolts. Next, side plates 1-2, 2-3, 3-4, and 4-5 are sequentially connected together with bolts. After completing the above preparations, the support plate 9 is fixed to the fixing plate 8 with bolts. Then, the forming tube 11 is passed through the guide cylinder 10, and the lower end of the forming tube 11 is fitted onto the positioning platform 6. Concrete and other materials are then poured into the forming cavity, simultaneously... Vibration is used to expel air from the concrete and other materials. After the concrete is poured, the concrete is allowed to cure. When the concrete has cured for a certain period of time or to a certain extent, the handle 16 is used to quickly lift the plumb bar 14 and the hammer 15. The impact of the hammer 15 with the annular flange 12 can move the forming tube 11 upward. Through repeated impacts, the forming tube 11 can be continuously moved upward. When the forming tube 11 has moved upward a distance of about 2 / 3 of its total height, it can be directly removed from the concrete.

[0021] A release agent, such as mineral oil, can be applied to the surfaces of the molding tube 11, base plate 1, side plate 1, side plate 2, side plate 2, side plate 3, side plate 3, and side plate 4 5 to reduce adhesion to concrete.

[0022] By using the guide tube 10, it can be ensured that the forming tube 11 can maintain a relatively vertical state when moving upward, thereby reducing damage to the staircase 18.

[0023] The degree of concrete solidification can be tested by finger pressure. Only when the concrete has solidified to a certain extent but has not yet completely solidified can the forming tube 11 be removed from the staircase 18, so as to ensure the quality of the staircase 18 is up to standard and reduce the resistance of removing the forming tube 11.

[0024] The timing for removing the forming tube 11 can be estimated based on the local temperature and drying conditions. For example, the time interval between when the concrete is left to stand and solidify until the forming tube 11 can be removed is 5 hours. If the time interval is 5 hours, the staff can remove the forming tube 11 at the 5-hour mark.

[0025] When vibrating the concrete in the molding cavity, it is necessary to avoid prolonged contact between the vibrator and the internal steel reinforcement cage, bottom plate 1, side plate 1 2, side plate 2 3, side plate 3 4, side plate 4 5, and molding tube 11, so as to improve the durability of the molding mold.

[0026] After the concrete in the molding cavity has completely solidified, the support plate 9 is first removed from the fixed plate 8. Then, the side plates 1-2, 2-3, 3-4, and 4-5 are knocked off the side of the staircase 18 in sequence. The staircase 18 is then moved out by a crane. After the staircase 18 is lifted, the bottom plate 1 is knocked off first, and then the staircase 18 is moved.

[0027] Furthermore, a guide rod 17 is provided between the annular flange 12 and the annular baffle 13, and a through hole is provided on the hammer head 15 for the guide rod 17 to pass through, the inner diameter of the through hole being larger than the outer diameter of the guide rod 17.

[0028] The guide rod 17 is a metal rod that guides the upward movement of the hammer head 15. When the hammer head 15 moves upward along the guide rod 17, the side wall of the hammer head 15 does not contact the inner wall of the forming tube 11, thereby avoiding friction between the hammer head 15 and the inner wall of the forming tube 11. At the same time, due to the presence of the guide rod 17, the forming tube 11 can be rotated by the handle 16, the plumb rod 14, the hammer head 15, and the guide rod 17. After the forming tube 11 is separated from the positioning table 6, rotating the forming tube 11 can keep the inner surface of the core of the stair 18 relatively smooth, thereby improving the quality of the stair 18.

[0029] Furthermore, there are two guide rods 17, which are symmetrically arranged about the vertical rod 14.

[0030] Furthermore, the upper end of the positioning table 6 is chamfered to facilitate the insertion of the forming tube 11 into the positioning table 6.

[0031] Furthermore, the positioning platform 6 is made of rubber, and the outer diameter of the positioning platform 6 is slightly larger than the inner diameter of the lower end of the forming tube 11.

[0032] After the forming tube 11 and the positioning platform 6 are fully engaged, the positioning platform 6 is in a compressed state, which can improve the stability and sealing of the engagement between the forming tube 11 and the positioning platform 6, so as to prevent concrete from entering the forming tube 11. The inner diameter of the forming tube 11 is 50mm and the outer diameter of the positioning platform 6 is 51mm.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A prefabricated staircase core-pulling mold, characterized in that, The system includes a base plate, on which are provided side plates one, two, three, and four. Side plates one, two, three, and four, together with the base plate, form a stair-forming cavity with an open top. Positioning platforms are evenly distributed on the base plate. Side plate one is used for forming the stair steps and has multiple step surfaces. A fixing plate is provided at the upper end of each step surface. The system also includes a support plate on the fixing plate, a through groove on the support plate, and a guide cylinder communicating with the through groove. The system also includes a forming tube. The positioning platforms can enter the interior of the forming tube. The forming tube is slidably connected to the guide cylinder. An annular flange extending into the interior of the forming tube is provided at the upper end of the forming tube. An annular baffle is provided inside the forming tube. The system also includes a plumb rod with a hammer at the lower end. The hammer is located inside the forming tube and between the annular flange and the annular baffle. A handle is provided on the upper side of the plumb rod.

2. The prefabricated staircase core-pulling mold according to claim 1, characterized in that, A guide rod is provided between the annular flange and the annular baffle. A through hole is provided on the hammer head for the guide rod to pass through. The inner diameter of the through hole is larger than the outer diameter of the guide rod.

3. The prefabricated staircase core-pulling mold according to claim 2, characterized in that, Two guide rods are provided and are arranged symmetrically about the vertical rod.

4. The prefabricated staircase core-pulling mold according to claim 1, characterized in that, The upper end of the positioning platform is chamfered.

5. The prefabricated staircase core-pulling mold according to claim 4, characterized in that, The positioning platform is made of rubber, and its outer diameter is slightly larger than the inner diameter of the lower end of the forming tube.

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