A modular, precast concrete staircase

Abstract

This utility model relates to the field of building assembly technology and discloses a modular precast concrete staircase, including a frame. Multiple concrete steps are equidistantly installed on adjacent sides of the outer wall of the frame. A docking mechanism is installed at the center of the front side of the outer wall of each concrete step for quick connection of the staircase. Lifting mechanisms are installed on both the left and right sides of the top of the frame for adjusting the height of the handrails. The docking mechanism includes a hollow long plate, which is equidistantly installed at the center of the front side of the outer wall of the concrete steps. In this utility model, after the long rack is in place, the pull rod is released, and a spring pushes a short rack to engage with the long rack, completing the fixation. Pulling the pull rod disengages the short rack from the long rack, and rotating the short column in the opposite direction causes the gear to retract the long rack back into the hollow long plate, disengaging the connection. This achieves rapid assembly and disassembly of the modular staircase, significantly improving construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of building assembly technology, and in particular to a modularly assembled precast concrete staircase. Background Technology

[0002] Precast concrete stairs are concrete stair components that are prefabricated in a factory and then transported to the construction site for installation. They are an important part of prefabricated buildings. Modular precast concrete stairs are based on the concept of prefabricated buildings, breaking down the stairs into multiple standardized prefabricated modules. After being prefabricated in the factory, they are transported to the construction site and assembled into a stair structure through precise splicing. Through modular design, it achieves the standardization of components, industrialization of production, and high efficiency of installation, and is an advanced form of precast concrete stairs.

[0003] Existing modular precast concrete staircases involve pre-drilling bolt holes at the top of the precast staircase, filling the lower part of the bolt holes with high-strength grout, and sealing the top with mortar. If the bottom is a sliding hinge support, a cavity is formed below the bolt holes using a nut and washer, and the upper part of the nut and washer is sealed with mortar. Tightening the bolts securely connects the staircase to the platform. However, when manually tightening the bolts, the tightness depends on the experience of the construction worker, making it impossible to guarantee consistent preload on each bolt. If some bolts are too loose, the connection joints will loosen, leading to problems later. Abnormal noises or displacement may occur during use; if too tight, the bolt shank may undergo plastic deformation or even break, or the concrete of the precast module may crack due to excessive compression, affecting the overall connection reliability. The existing technology uses a torque wrench, which sets a specific torque value and will issue a prompt or stop automatically when the torque is reached, thereby precisely controlling the bolt tightening force and ensuring that the preload of each bolt is consistent. However, the bolts need to be loosened one by one when disassembling, which takes more time and causes inconvenience to subsequent disassembly work. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a modular precast concrete staircase, which aims to improve the problem that the existing technology requires more time to twist and disassemble, thus causing inconvenience to subsequent disassembly work.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a modular precast concrete staircase, comprising a frame, wherein multiple concrete steps are equidistantly installed on adjacent sides of the outer wall of the frame, and a docking mechanism is installed in the middle of the front side of the outer wall of the concrete steps for quick docking of the staircase; lifting mechanisms are installed on both the left and right sides of the top of the frame for adjusting the height of the handrail; the docking mechanism comprises a hollow long plate, which is equidistantly installed in the middle of the front side of the outer wall of the concrete steps; long racks are slidably connected to the left and right sides of the interior of the hollow long plate; multiple hollow short blocks are fixedly connected to the left and right sides of the outer wall of the frame; multiple rotating short columns are rotatably connected to the interior of the hollow long plate; gears are fixedly connected to the outer wall of the rotating short columns; multiple tie rods are slidably connected to the interior of the hollow short blocks; springs are installed on the outer wall of the tie rods; and short racks are fixedly connected to the rear end of the outer wall of the springs.

[0006] As a further description of the above technical solution:

[0007] The lifting mechanism includes a hollow inner sliding cylinder, which is installed on the top left and right sides of the frame. An adjusting cylinder is slidably connected inside the hollow inner sliding cylinder. A threaded rod is rotatably connected to the bottom of the inner wall of the middle hollow inner sliding cylinder. An internal threaded cylinder is threadedly connected to the outer wall of the threaded rod. A rotating component is installed at the bottom of the inner wall of the middle hollow inner sliding cylinder.

[0008] As a further description of the above technical solution:

[0009] The rotating assembly includes a worm gear, which is installed at the bottom of the inner wall of the central hollow inner groove cylinder. A worm wheel is meshed with the outer wall of the worm gear. Multiple support plates are fixedly connected at equal intervals on adjacent sides of the outer wall of the central hollow inner groove cylinder. A sliding rod is fixedly connected to adjacent sides of the outer wall of the support plates. A moving block is fixedly connected to the outer wall of the adjusting cylinder.

[0010] As a further description of the above technical solution:

[0011] The inner wall of the moving block is slidably connected to the outer wall of the sliding rod, and the middle part of the inner wall of the worm gear is fixedly connected to the lower middle part of the outer wall of the threaded rod.

[0012] As a further description of the above technical solution:

[0013] A handle is fixedly connected to one adjacent end of the outer wall of the worm gear, and a protective sleeve is fixedly connected to the outer wall of the handle.

[0014] As a further description of the above technical solution:

[0015] The short rack engages with the long rack, and the gear meshes with the long rack.

[0016] As a further description of the above technical solution:

[0017] The top of the concrete steps is connected by multiple bolts at equal intervals, and the outer wall of each bolt is connected by an anti-slip pad.

[0018] As a further description of the above technical solution:

[0019] Two bolts are threadedly connected to the outer wall of the regulating cylinder on the side furthest from the center, and a warning sign is threadedly connected to the outer wall of each bolt.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, rotating the short column drives the gear to rotate, causing the long rack to extend to both sides along the hollow plate until it is inserted into the hollow short block of the frame. Pulling the pull rod causes the short rack to compress the spring and move backward. After the long rack is in place, the pull rod is released, and the spring pushes the short rack to lock with the long rack, completing the fixation. Pulling the pull rod causes the short rack to disengage from the long rack. Rotating the short column in the opposite direction causes the gear to drive the long rack to retract into the hollow plate, disengaging the connection. This achieves rapid assembly and disassembly of the modular staircase, significantly improving construction efficiency.

[0022] 2. In this utility model, the rotating worm drives the worm wheel, which drives the threaded rod to rotate synchronously. The threaded rod drives the inner threaded cylinder to move axially, pushing the adjusting cylinder to slide up and down in the hollow inner sliding groove cylinder. The moving block slides synchronously along the sliding rod, ensuring vertical stability during the adjustment process and realizing adaptive adjustment of the handrail height, thereby improving the adaptability and safety of the staircase. Attached Figure Description

[0023] Figure 1 This is a front view of a modularly assembled precast concrete staircase proposed in this utility model.

[0024] Figure 2 This is a perspective view of a modularly assembled precast concrete staircase proposed in this utility model.

[0025] Figure 3 This is a partial structural breakdown diagram of a modularly assembled precast concrete staircase proposed in this utility model.

[0026] Figure 4 This is a partial exploded view of the modularly assembled precast concrete staircase proposed in this utility model.

[0027] Figure 5 This is a schematic diagram of the lifting mechanism of a modularly assembled precast concrete staircase proposed in this utility model.

[0028] Figure 6 This is a disassembled diagram of the lifting mechanism of a modularly assembled precast concrete staircase proposed in this utility model.

[0029] Legend:

[0030] 1. Frame; 2. Docking mechanism; 201. Hollow long plate; 202. Hollow short block; 203. Short rack; 204. Gear; 205. Long rack; 206. Rotating short column; 207. Tie rod; 208. Spring; 3. Lifting mechanism; 301. Hollow inner grooved cylinder; 302. Adjusting cylinder; 303. Internal threaded cylinder; 304. Threaded rod; 305. Rotating assembly; 3051. Worm gear; 3052. Worm wheel; 3053. Support plate; 3054. Moving block; 3055. Sliding rod; 4. Protective sleeve; 5. Handle; 6. Concrete step; 7. Bolt one; 8. Anti-slip mat; 9. Bolt two; 10. Warning sign. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 3 and Figure 4This utility model provides an embodiment of a modularly assembled precast concrete staircase, comprising a frame 1. Multiple concrete steps 6 are equidistantly installed on adjacent sides of the outer wall of the frame 1. A docking mechanism 2 is installed at the center of the front side of the outer wall of each concrete step 6, for quickly docking the staircase. Lifting mechanisms 3 are installed on both the left and right sides of the top of the frame 1, for adjusting the height of the handrails. The docking mechanism 2 includes a hollow long plate 201, equidistantly installed at the center of the front side of the outer wall of the concrete steps 6. Long toothed racks 205 are slidably connected to the left and right sides of the interior of the hollow long plate 201. Multiple hollow short blocks 202 are fixedly connected to the left and right sides of the outer wall of the frame 1. The interior of the hollow long plate 201 is equidistantly rotatable. Multiple rotating short columns 206 are connected to the outer wall of the rotating short columns 206. Gears 204 are fixedly connected to the outer wall of the rotating short columns 206. Multiple tie rods 207 are equidistantly connected inside the hollow short block 202. Springs 208 are installed on the outer wall of the tie rods 207. A short rack 203 is fixedly connected to the rear end of the outer wall of the spring 208. The short rack 203 engages with a long rack 205. The gears 204 mesh with the long rack 205. By rotating the gears 204 and meshing with the long rack 205, the long rack 205 can be driven to expand outward. Multiple bolts 7 are equidistantly threaded at the top of the concrete steps 6. Anti-slip pads 8 are threaded on the outer wall of the bolts 7. The anti-slip pads 8 can enhance the friction when people step on the stairs and prevent their feet from slipping.

[0033] Specifically, rotating the rotating short column 206 inside the hollow long plate 201 causes the gear 204 fixed on its outer wall to rotate accordingly. Since the gear 204 meshes with the elongated racks 205 on the left and right sides, it drives the elongated racks 205 to extend outwards along the hollow long plate 201 until their ends reach the inside of the hollow short block 202 on the outer wall of the frame 1. At this point, pulling the pull rod 207 inside the hollow short block 202 causes the short rack 203 to compress the spring 208 and move backward, reserving space for the long rack 205 to engage. Once the long rack 205 is fully in place, releasing the pull rod 207 causes the spring 208 to return to its original position, pushing the short rack 203 forward to precisely engage with the long rack 205, thus achieving rapid fixing of the concrete steps 6 to the frame 1 and completing the splicing. During disassembly, pulling the lever 207 compresses the short rack 203, causing it to disengage from the long rack 205. Then, the short column 206 is rotated in the opposite direction, and the gear 204 drives the long rack 205 back into the hollow plate 201, thus detaching the concrete staircase 6 from the frame 1. This eliminates the need to tighten each bolt individually, avoiding the time-consuming problem of disassembling traditional bolted connections. The gear 204 meshes with the long rack 205, and by rotating the gear 204 and meshing with the long rack 205, the long rack 205 can be driven to expand outward. The top of the concrete staircase 6 is threaded with multiple bolts 7 at equal intervals. The outer wall of each bolt 7 is threaded with an anti-slip pad 8, which enhances the friction when people step on the stairs, preventing slippage.

[0034] Reference Figure 2 , Figure 5 and Figure 6 The lifting mechanism 3 includes a hollow inner sliding cylinder 301, which is installed on the top left and right sides of the frame 1. An adjusting cylinder 302 is slidably connected inside the hollow inner sliding cylinder 301. A threaded rod 304 is rotatably connected to the bottom of the inner wall of the central hollow inner sliding cylinder 301. An inner threaded cylinder 303 is threadedly connected to the outer wall of the threaded rod 304. A rotating assembly 305 is installed at the bottom of the inner wall of the central hollow inner sliding cylinder 301. The rotating assembly 305 includes a worm gear 3051, which is installed at the bottom of the inner wall of the central hollow inner sliding cylinder 301. A worm gear 3052 is meshed with the outer wall of the worm 3051. Multiple support plates 3053 are fixedly connected at equal intervals on the adjacent side of the outer wall of the hollow inner sliding groove cylinder 301 in the middle. A sliding rod 3055 is fixedly connected to the adjacent side of the outer wall of the support plate 3053. A moving block 3054 is fixedly connected to the outer wall of the adjusting cylinder 302. The inner wall of the moving block 3054 is slidably connected to the outer wall of the sliding rod 3055. The middle part of the inner wall of the worm gear 3052 is fixedly connected to the lower middle part of the outer wall of the threaded rod 304. The rotation of the worm gear 3052 can drive the threaded rod 304 to rotate synchronously.

[0035] Specifically, when the operator rotates the worm gear 3051, the worm gear 3051 meshes with the worm wheel 3052, which is fixed to the lower middle part of the threaded rod 304. Therefore, the threaded rod 304 rotates synchronously with the worm wheel 3052. When the threaded rod 304 rotates, the internal threaded cylinder 303, which is threaded to it, moves linearly along the axial direction. The top of the internal threaded cylinder 303 is fixedly connected to the adjusting cylinder 302, forcing the adjusting cylinder 302 to slide up and down inside the hollow inner sliding groove cylinder 301. At the same time, the moving block 3054 on the outside of the adjusting cylinder 302 slides synchronously along the sliding rod 3055, ensuring the stability and verticality of the adjustment process. When the adjusting cylinder 302 rises or falls to the target position, the adaptive adjustment of the handrail height is achieved. The middle part of the inner wall of the worm wheel 3052 is fixedly connected to the lower middle part of the outer wall of the threaded rod 304. The rotation of the worm wheel 3052 can drive the threaded rod 304 to rotate synchronously.

[0036] Reference Figure 1 , Figure 2 and Figure 3 Each of the adjacent ends of the outer wall of the worm gear 3051 is fixedly connected to a handle 5, and a protective sleeve 4 is fixedly connected to the outer wall of the handle 5. The handle 5 facilitates the rotation of the worm gear 3051 by the operator. Each of the outer walls of the adjusting cylinder 302 is threaded with a bolt 9 on the middle of the side away from the other. A warning sign 10 is threaded to the outer wall of the bolt 9. The warning sign 10 serves to remind the operator of precautions during use, thereby reducing the probability of accidents.

[0037] Specifically, a handle 5 is fixedly connected to one end of the outer wall of the worm gear 3051, and a protective sleeve 4 is fixedly connected to the outer wall of the handle 5. The handle 5 facilitates the rotation of the worm gear 3051 by the operator. Bolt 9 is threadedly connected to the middle of the outer wall of the adjusting cylinder 302 on the side away from each other. A warning sign 10 is threadedly connected to the outer wall of bolt 9. The warning sign 10 can remind the operator of the precautions during use, thereby reducing the probability of accidents.

[0038] Working principle: Rotating the rotating short column 206 inside the hollow long plate 201 causes the gear 204 fixed on its outer wall to rotate accordingly. Since the gear 204 meshes with the elongated racks 205 on the left and right sides, it drives the elongated racks 205 to extend to both sides along the hollow long plate 201 until the end of the elongated racks 205 extends to the inside of the hollow short block 202 on the outer wall of the frame 1. At this time, pulling the pull rod 207 inside the hollow short block 202 causes the short rack 203 to compress the spring 208 and move backward, reserving engagement space for the elongated rack 205. When the elongated rack 205 is fully engaged... After positioning, release the pull rod 207, and the spring 208 returns to its original position, pushing the short rack 203 forward to precisely engage with the long rack 205, thus quickly fixing the concrete staircase 6 to the frame 1 and completing the splicing. During disassembly, pull the pull rod 207 to compress the spring 208 with the short rack 203 and disengage it from the long rack 205. Then, rotate the short column 206 in the opposite direction, and the gear 204 drives the long rack 205 back into the hollow long plate 201, releasing the connection between the concrete staircase 6 and the frame 1. This eliminates the need to tighten each bolt individually, avoiding the time-consuming problem of disassembly in traditional bolted connections.

[0039] When the operator rotates the worm gear 3051, it meshes with the worm wheel 3052, which is fixed to the lower middle part of the threaded rod 304. Therefore, the threaded rod 304 rotates synchronously with the worm wheel 3052. When the threaded rod 304 rotates, the internal threaded cylinder 303, which is threaded to it, moves linearly along the axial direction. The top of the internal threaded cylinder 303 is fixedly connected to the adjusting cylinder 302, forcing the adjusting cylinder 302 to slide up and down inside the hollow inner sliding groove cylinder 301. At the same time, the moving block 3054 on the outside of the adjusting cylinder 302 slides synchronously along the sliding rod 3055, ensuring the stability and verticality of the adjustment process. When the adjusting cylinder 302 rises or falls to the target position, the adaptive adjustment of the handrail height is achieved.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A modular assembled concrete precast stair comprising a frame (1), characterized in that: Multiple concrete steps (6) are installed at equal intervals on the adjacent side of the outer wall of the frame (1). A docking mechanism (2) is installed in the middle of the front side of the outer wall of the concrete steps (6). The docking mechanism (2) is used for quick docking of the stairs. Lifting mechanisms (3) are installed on the left and right sides of the top of the frame (1). The lifting mechanism (3) is used to lift and adjust the height of the handrail. The docking mechanism (2) includes a hollow long plate (201), which is equidistantly installed on the front middle of the outer wall of the concrete step (6). The hollow long plate (201) is slidably connected to the left and right sides of the interior of the hollow long plate (201). Multiple hollow short blocks (202) are fixedly connected to the left and right sides of the outer wall of the frame (1). Multiple rotating short columns (206) are equidistantly rotatably connected to the interior of the hollow long plate (201). Gears (204) are fixedly connected to the outer wall of the rotating short columns (206). Multiple tie rods (207) are equidistantly slidably connected to the interior of the hollow short blocks (202). Springs (208) are installed on the outer wall of the tie rods (207). Short racks (203) are fixedly connected to the rear end of the outer wall of the springs (208).

2. A modular assembled concrete precast stair according to claim 1, characterized in that: The lifting mechanism (3) includes a hollow inner sliding cylinder (301), which is installed on the top left and right sides of the frame (1). An adjusting cylinder (302) is slidably connected inside the hollow inner sliding cylinder (301). A threaded rod (304) is rotatably connected to the bottom of the inner wall of the hollow inner sliding cylinder (301) in the middle. An inner threaded cylinder (303) is threadedly connected to the outer wall of the threaded rod (304). A rotating component (305) is installed at the bottom of the inner wall of the hollow inner sliding cylinder (301) in the middle.

3. A modular assembled concrete precast stair according to claim 2, characterized in that: The rotating assembly (305) includes a worm gear (3051), which is installed at the bottom of the inner wall of the hollow inner groove cylinder (301) in the middle. A worm wheel (3052) is meshed with the outer wall of the worm gear (3051). A plurality of support plates (3053) are fixedly connected at equal intervals on the adjacent side of the outer wall of the hollow inner groove cylinder (301) in the middle. A sliding rod (3055) is fixedly connected to the adjacent side of the outer wall of the support plate (3053). A moving block (3054) is fixedly connected to the outer wall of the adjusting cylinder (302).

4. A modular assembled concrete precast stair according to claim 3, characterized in that: The inner wall of the movable block (3054) is slidably connected to the outer wall of the sliding rod (3055), and the middle part of the inner wall of the worm gear (3052) is fixedly connected to the lower middle part of the outer wall of the threaded rod (304).

5. A modular assembled concrete precast stair according to claim 3, characterized in that: Each of the adjacent ends of the outer wall of the worm (3051) is fixedly connected to a handle (5), and a protective sleeve (4) is fixedly connected to the outer wall of the handle (5).

6. A modular assembled concrete precast stairway according to claim 1, characterized in that: The short rack (203) engages with the long rack (205), and the gear (204) meshes with the long rack (205).

7. A modularly assembled precast concrete staircase according to claim 1, characterized in that: The top of the concrete step (6) is threaded with multiple bolts (7) at equal intervals, and the outer wall of the bolts (7) is threaded with anti-slip pads (8).

8. A modular assembled concrete precast stairway according to claim 2, characterized in that: The outer wall of the adjusting cylinder (302) is threadedly connected with a bolt two (9) in the middle of the far side, and the outer wall of the bolt two (9) is threadedly connected with a warning sign (10).

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