Protective platform used in building elevator shaft and building elevator shaft

Abstract

The utility model relates to a protection platform used in a building elevator shaft, which comprises a platform and a bearing device, the platform comprises a frame, a square steel main edge, a square steel secondary edge and a floor, the frame comprises square steel side edges, and the square steel side edges are connected to form the frame; the square steel main ridges are transversely arranged in the frame at intervals, and the square steel secondary ridges are vertically arranged in the frame at intervals; hanging rings are arranged on the surface of the floor at intervals, the size of the floor is smaller than that of the frame, and the floor is arranged in the frame and located above the square steel main ridges and the square steel secondary ridges. In the design of the platform, sliding gaps are reserved between the left side and the right side of the platform and the square steel edges of the frame, and a sliding mechanism of the bearing device is combined, so that the bearing device can stably slide in the length direction of the square steel edges in the installation or adjustment process of the platform.

Description

Technical Field

[0001] This utility model relates to a protective platform for use in building elevator shafts and to building elevator shafts. Background Technology

[0002] In the construction industry, falls from heights are the most frequent of the five major types of accidents, posing a serious challenge to construction safety for a long time. This is especially true in the unique working environment of elevator shafts, where the interconnected shafts significantly increase the risk of accidents.

[0003] Traditional construction methods typically involve erecting elevator shaft operating platforms from the bottom up using steel pipe scaffolding. However, this method has drawbacks such as cumbersome erection and dismantling processes, time-consuming and labor-intensive material transportation, complex construction operations, and a low safety factor.

[0004] Therefore, how to provide a more stable and convenient construction platform while ensuring operational efficiency has become an urgent problem to be solved in the construction industry. Utility Model Content

[0005] The primary objective of this invention is to provide a protective platform that shortens the time required for platform erection and dismantling, while also improving the safety and stability of the platform after it is secured.

[0006] The second objective of this utility model is to provide a building elevator shaft that shortens the time for erecting and dismantling the platform, and improves the safety and stability of the platform after it is fixed.

[0007] The primary objective of this invention is achieved as follows:

[0008] A protective platform for use in a building elevator shaft includes a platform and a support device. The platform includes a frame, main square steel ribs, secondary square steel ribs, and a floor. The frame includes side square steel ribs, which are connected to form the frame.

[0009] The main square steel ribs are arranged horizontally at intervals within the frame, and the secondary square steel ribs are arranged vertically at intervals within the frame.

[0010] The surface of the floor is provided with hanging rings at intervals. The size of the floor is smaller than the size of the frame. The floor is set inside the frame and located above the main square steel ribs and secondary square steel ribs.

[0011] The floor, frame, main square steel ribs and secondary square steel ribs are connected together by welding.

[0012] A sliding gap is formed between the left side of the platform and the square steel edge of the frame, and a sliding gap is formed between the right side of the platform and the square steel edge of the frame.

[0013] The supporting device includes a square steel pipe and a connecting plate. The connecting plate is welded to the square steel pipe. The square steel pipe is slidably fitted onto the square steel edge near the sliding gap, so that the supporting device can slide along the length of the square steel edge. The connecting plate is located above the floor and has a through hole or a first threaded hole to facilitate the passage of bolts.

[0014] The floor, frame, main square steel ribs, and secondary square steel ribs are firmly connected by welding to form an integrated structure, which significantly improves the overall stability and load-bearing capacity of the platform and effectively reduces safety hazards caused by loose nodes or weak connections.

[0015] In the platform design, a sliding gap is reserved between the left and right sides and the square steel edge of the frame. Combined with the sliding mechanism of the support device, the support device can slide smoothly along the length of the square steel edge during the installation or adjustment of the platform.

[0016] After the hoisting platform reaches the predetermined height, the user can quickly lock the platform by passing bolts through the through holes or the first threaded hole on the connecting plate, which greatly shortens the installation and dismantling time and improves construction efficiency.

[0017] By tightly integrating the support device with the platform structure and ensuring its accurate positioning and fixation, the protective platform is securely fixed in the designated location in the elevator shaft, effectively preventing construction accidents such as falls from heights. The lifting rings installed on the platform surface further provide convenient and reliable support for subsequent construction and emergency work relocation.

[0018] Made of square steel and with a frame structure, it has high bending and torsional strength, making it suitable for use in complex spaces such as elevator shafts.

[0019] The primary objective of this utility model can also be achieved by the following technical measures:

[0020] Furthermore, reinforcing ribs are provided between the secondary square steel ribs and the edge square steel ribs at the bottom of the floor, and the secondary square steel ribs, reinforcing ribs, and edge square steel ribs are connected together by welding.

[0021] The addition of reinforcing ribs effectively improves the connection strength between components, significantly enhancing the overall rigidity of the platform and thus improving its stability and safety under construction loads. The overall structure's bending resistance and deformation resistance are significantly improved, effectively preventing fatigue or torsional deformation caused by excessive local stress.

[0022] By reinforcing the welded connections between the ribs and other key components, the platform maintains a stable connection under high-intensity loads and long-term use. This design not only improves the platform's vibration resistance but also reduces structural fatigue caused by long-term vibration or load impact, providing a more reliable guarantee for safe operation during construction.

[0023] In working environments such as building elevator shafts, the confined space and working at heights require platforms with higher structural stability. The introduction of reinforcing ribs can better distribute the stress evenly, avoiding load concentration, thereby improving the platform's adaptability and safety when operating in narrow spaces.

[0024] Furthermore, it also includes a collection net for receiving garbage, with hooks spaced apart in the sliding gap, and the collection net having hanging ears that hook onto the corresponding hooks, so that the collection net is hooked under the floor.

[0025] The collection net is fixed to the sliding gap by hooks, so that the collection net is suspended below the floor, thereby preventing construction waste from falling into the building elevator shaft due to gravity or vibration, ensuring a clean environment inside the shaft and reducing foreign objects from interfering with construction safety.

[0026] The structure design with hanging ears and hooks makes the installation and disassembly of the collection net simple and convenient, allowing construction workers to quickly replace or clean up garbage, reducing the difficulty of manual operation and improving the overall construction efficiency.

[0027] Because the garbage is effectively collected and scattered, this design further prevents safety accidents such as slips and trips caused by garbage accumulation or falling, providing a higher level of safety for the working environment.

[0028] Furthermore, it also includes a locking bolt, wherein the surface of the square steel tube has a second threaded hole, and the locking bolt passes through the second threaded hole and abuts against the edge of the square steel tube to lock the sliding position of the support device.

[0029] The locking bolts can firmly fix the support device in the predetermined position after the position is adjusted, preventing slippage caused by vibration or external interference and ensuring the positioning accuracy of the platform during use.

[0030] After the support device is adjusted, it can be locked by simply tightening bolts, reducing complicated operation steps and making it easier for construction personnel to quickly lock and adjust the position of the protective platform, thus improving construction efficiency.

[0031] The locking mechanism ensures that the protective platform remains stable during long-term use in the elevator shaft and is not easily displaced by external forces or other operations during construction, thus providing a solid safety guarantee for high-altitude operations.

[0032] Furthermore, the main rib of the square steel is 40*80mm square steel, the secondary rib of the square steel is 50*50mm square steel, and the edge rib of the square steel is 50*50mm square steel. The square steel pipe is 40*80mm square steel, the wall thickness of the square steel pipe is 10mm steel plate, the floor is 1.5mm-3mm thick patterned steel plate, and the lifting ring is 18mm round steel lifting ring.

[0033] The main ribs of the square steel are made of square steel with a larger cross-sectional size, which can provide higher lateral support force, thereby enhancing the rigidity and stability of the overall platform.

[0034] The two sizes of square steel secondary ribs and square steel edge ribs are welded together to form a tight connection, ensuring that the stress on each part of the structure is balanced, effectively preventing local deformation or loosening, and improving the safety of the platform in complex working environments.

[0035] The thick steel plate wall of the square steel pipe ensures the strength and durability of the support device during sliding and locking, avoiding deformation or wear due to collision or long-term use, and ensuring that the platform stability remains at a high level for a long time.

[0036] The 10mm thick patterned steel plate not only provides sufficient load-bearing capacity but also effectively controls the overall weight of the platform, making the lifting and installation process more convenient while reducing material costs and energy consumption.

[0037] The 18mm round steel lifting rings ensure sufficient load-bearing capacity while facilitating the lifting and securing of the protective platform during construction, thus balancing structural strength and lightweight requirements.

[0038] Welding is used to fix each component, making the overall structure of the platform robust and with excellent seismic performance. This effectively prevents safety hazards caused by accumulated errors or loose connections, while also improving the speed and efficiency of on-site assembly and disassembly.

[0039] The second objective of this utility model is achieved as follows:

[0040] An elevator shaft for buildings includes a shaft body, a crane, bolts, and a first nut, wherein the shaft body has bolt through holes at the bottom of each floor slab;

[0041] The protective platform is movably placed inside the shaft body, and the hoist's sling is connected to the lifting ring of the protective platform. The operation of the hoist drives the protective platform to rise and fall.

[0042] When the through hole or first threaded hole of the protective platform is aligned with the bolt through hole of the shaft body, the bolt passes through the bolt through hole, through hole or first threaded hole to connect the first nut, thereby locking the shaft body and the protective platform.

[0043] When the through hole or the first threaded hole of the protective platform is aligned with the bolt through hole of the shaft body, the bolt penetrates and is fixed with the first nut to form a stable connection, which effectively prevents the protective platform from being accidentally displaced during use, thereby greatly reducing the safety hazards caused by platform loosening.

[0044] By using a crane to connect the lifting rings of the protective platform with slings, the platform can be raised and lowered, allowing it to flexibly adapt to the corresponding bolt holes under each floor slab. This ensures accurate platform positioning, easy operation, and provides an efficient height adjustment solution for construction.

[0045] The locking process uses bolt penetration and first nut fixing, which is simple and clear. It allows construction personnel to quickly complete the locking operation between the platform and the shaft body after the platform is adjusted into place, thereby saving debugging and installation time and improving the efficiency of the entire construction process.

[0046] The design incorporates a movable platform, which is uniformly controlled through bolt holes located under each floor slab on the main shaft. This allows the protective platform to adapt to different floor slabs and working conditions, exhibiting good versatility and adaptability, while also meeting the diverse spatial layouts and operational needs of elevator shafts.

[0047] The second objective of this utility model can also be achieved by the following technical measures:

[0048] Furthermore, the bolt is a 20mm shear-resistant high-strength bolt.

[0049] High-strength bolts have excellent shear resistance, and can resist shear forces and vibrations that may occur during construction at the connection between the protective platform and the main shaft, ensuring a firm connection and preventing loosening or displacement caused by stress.

[0050] By using 20mm shear-resistant high-strength bolts, the safety and reliability of the locking mechanism are further improved, effectively reducing safety hazards caused by insufficient bolt load or fatigue damage, thus providing a more solid protective guarantee for high-altitude operations.

[0051] High-strength bolts can maintain high connection strength and durability during long-term use, avoiding performance degradation due to stress fatigue or environmental factors, and ensuring long-term stable locking between the protective platform and the shaft body.

[0052] In the construction environment, protective platforms and shaft systems are often subjected to multiple dynamic loads. 20mm shear bolts can fully meet the requirements for connection strength and safety under complex working conditions, and provide stable support for various construction operations.

[0053] Furthermore, the first nut is welded to the connecting plate of the protective platform, and the through hole or the first threaded hole is connected to the first nut.

[0054] The welding method firmly fixes the first nut to the connecting plate, avoiding safety hazards caused by the first nut loosening or shifting during use, thus ensuring a reliable connection between the platform and the shaft body.

[0055] Since the first nut is already fixed on the connecting plate, construction workers do not need to install or adjust the nut separately on site, making the assembly process of the bolt passing through the through hole and the first nut faster and simpler, thus improving construction efficiency.

[0056] After welding and fixing, the first nut forms an integrated connection with the through hole or the first threaded hole, which greatly reduces the loosening of the connection caused by installation errors and further improves the overall load-bearing capacity and shear strength of the locking mechanism.

[0057] Fixed welded connectors can effectively resist vibration and external forces during long-term use, ensuring the stability of the protective platform during multiple adjustments and long-term operation, reducing the frequency of maintenance and replacement, and thus extending the service life of the equipment.

[0058] Furthermore, it also includes a second nut, wherein the head of the bolt is a threaded head, the tail of the bolt is a threaded tail, the threaded tail passes through the through hole of the connecting plate or the first threaded hole to connect to the first nut, and the threaded head extends out of the bolt through hole of the shaft body to connect to the second nut.

[0059] The first nut and the second nut are located on the inner side of the connecting plate and the outer side of the shaft body, respectively, forming an inner and outer clamping structure. This effectively prevents the connection from loosening due to unilateral force or loosening, and improves the safety and reliability of the overall connection system.

[0060] The double-nut structure allows for quick locking or disassembly on the construction site as needed, especially in scenarios where the platform needs to be raised, lowered, or repositioned multiple times, thus improving construction efficiency and reducing working time.

[0061] The beneficial effects of this utility model are as follows:

[0062] This utility model features a protective platform that is slidably positioned by a support device and locked with a bolt and a first nut, enabling it to be quickly and securely locked to the designated floor height within the elevator shaft, ensuring the stability and safety of construction personnel during operation.

[0063] This utility model platform adopts a frame structure formed by welding square steel main ribs, secondary ribs and patterned steel plates, and is supported by reinforcing ribs, which effectively improves the overall load-bearing capacity and deformation resistance of the platform, and is suitable for various construction operations.

[0064] This utility model features a platform equipped with lifting rings, which can be lifted and lowered as a whole by a crane, eliminating the cumbersome steps of traditional scaffolding erection, greatly improving construction efficiency, and reducing the time spent on manual construction and dismantling.

[0065] This utility model features a simple collection net that is easy to install and remove. The collection net effectively prevents debris and garbage from falling into the bottom of the shaft through the platform's sliding gaps during construction, reducing safety hazards. It also facilitates later cleaning and improves the level of civilized construction. Attached Figure Description

[0066] Figure 1 This is a bottom view of the protective platform of Example 1.

[0067] Figure 2 This is a top view of the protective platform of Example 1.

[0068] Figure 3 This is a schematic diagram of the assembly of the support device, bolt, and first nut in Example 1.

[0069] Figure 4 This is a bottom view of the protective platform of Example 2.

[0070] Figure 5 This is a top view of the protective platform of Example 2.

[0071] Figure 6 This is a schematic diagram of the building elevator shaft in Example 3.

[0072] Figure 7 for Figure 6 Enlarged view of part A.

[0073] Figure 8 This is a schematic diagram of the building elevator shaft in Example 4.

[0074] Figure 9 for Figure 8 Enlarged view of part B. Detailed Implementation

[0075] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0076] Example 1, combined with Figures 1 to 3 As shown, a protective platform for use in building elevator shafts includes a platform 1 and a support device 3. The platform 1 includes a frame 2, square steel main ribs 11, square steel secondary ribs 12 and a floor 13. The frame 2 includes square steel side ribs 21, and the square steel side ribs 21 are connected to form the frame 2.

[0077] The main square steel ribs 11 are arranged horizontally at intervals within the frame 2, and the secondary square steel ribs 12 are arranged vertically at intervals within the frame 2.

[0078] The surface of the floor 13 is provided with hanging rings 131 at intervals. The size of the floor 13 is smaller than the size of the frame 2. The floor 13 is set inside the frame 2 and located above the main square steel rib 11 and the secondary square steel rib 12.

[0079] The floor 13, frame 2, main square steel rib 11 and secondary square steel rib 12 are connected together by welding.

[0080] A sliding gap 10 is formed between the left side of the platform 1 and the square steel edge 21 of the frame 2, and a sliding gap 10 is formed between the right side of the platform 1 and the square steel edge 21 of the frame 2.

[0081] The supporting device 3 includes a square steel pipe 31 and a connecting plate 32. The connecting plate 32 is welded to the square steel pipe 31. The square steel pipe 31 is slidably fitted onto the square steel edge 21 near the sliding gap 10, so that the supporting device 3 can slide along the length of the square steel edge 21. The connecting plate 32 is located above the floor 13 and has a through hole 321 for easy bolt passage.

[0082] Furthermore, a reinforcing rib 4 is provided between the square steel secondary rib 12 and the square steel edge rib 21 located at the bottom of the floor 13, and the square steel secondary rib 12, the reinforcing rib 4 and the square steel edge rib 21 are connected together by welding.

[0083] Furthermore, the main square steel rib 11 is a 40*80mm square steel, the secondary square steel rib 12 is a 50*50mm square steel, and the side square steel rib 21 is a 50*50mm square steel. The square steel pipe 31 is a 40*80mm square steel, the pipe wall thickness of the square steel pipe 31 is a 10mm steel plate, the floor 13 is a 1.5mm-3mm thick patterned steel plate, and the lifting ring 131 is an 18mm round steel lifting ring.

[0084] Example 2, combined with Figures 4 to 5 As shown, the difference between Example 2 and Example 1 is that:

[0085] Example 2 also includes a collection net for receiving garbage. Hooks 5 are provided at intervals in the sliding gap 10. The collection net is provided with hanging ears, and the hanging ears are hooked onto the corresponding hooks 5, so that the collection net is hooked under the floor 13.

[0086] Example 2 also includes a locking bolt. The square steel tube 31 has a second threaded hole 311 on its surface. The locking bolt passes through the second threaded hole 311 and abuts against the square steel edge 21 to lock the sliding position of the support device 3.

[0087] How to install the collection network:

[0088] The operator hooks each lug of the collection net onto the corresponding hook 5 in sequence. After installation, the collection net is tightened appropriately so that it is stretched and unfolded at the bottom of the platform 1, covering the entire sliding gap 10 area, ensuring that there is no obvious sagging or leakage, and ensuring that it can catch and intercept falling garbage during subsequent construction.

[0089] Example 3, combined with Figures 6 to 7 As shown, a building elevator shaft includes a shaft body 6, a crane, bolts 7, and a first nut 8. The shaft body 6 has bolt through holes 61 below each floor slab 62.

[0090] The protective platform 1 of Embodiment 1 or Embodiment 2 is placed in the shaft body 6 in a movable manner. The sling of the crane is connected to the lifting ring 131 of the protective platform 1. The operation of the crane drives the protective platform 1 to rise and fall.

[0091] When the through hole 321 of the protective platform 1 and the bolt through hole 61 of the shaft body 6 are aligned, the bolt 7 passes through the bolt through hole 61 and the through hole 321 to connect the first nut 8, thereby locking the shaft body 6 and the protective platform 1.

[0092] Furthermore, the bolt 7 is a 20mm shear-resistant high-strength bolt 7.

[0093] Operating procedure for locking the protective platform 1 (using bolt 7 and first nut 8)

[0094] First, the lifting ring 131 of the protective platform 1 is connected by the sling of the crane. The protective platform 1 is slowly lifted to the corresponding floor slab 62 position by the crane operation, so that the through hole 321 on the connecting plate 32 of the platform 1 is aligned with the bolt through hole 61 at the bottom of the floor slab 62 of the shaft body 6.

[0095] Next, the worker stands on the next floor slab 62 and inserts the bolts 7 from the outside of the shaft body 6 through the bolt through holes 61 of the shaft body 6 and the through holes 321 of the connecting plate 32 of the protective platform 1 outward.

[0096] Next, since the vertical distance between the floor slab 62 and the protective platform 1 is very small, another worker can squat on the corresponding floor slab 62 and manually tighten the first nut 8 and the locking bolt 7 to lock the protective platform 1 into the shaft body 6.

[0097] Finally, disconnect the sling and the shackle 131.

[0098] Furthermore, the first nut 8 is welded to the connecting plate 32 of the protective platform 1, and the through hole 321 is connected to the first nut 8.

[0099] The locking method for the protective platform 1 (using bolt 7 and first nut 8, the first nut 8 is welded to the protective platform 1).

[0100] First, the lifting ring 131 of the protective platform 1 is connected by the sling of the crane. The protective platform 1 is slowly lifted to the corresponding floor slab 62 position by the crane operation, so that the through hole 321 on the connecting plate 32 of the platform 1 is aligned with the bolt through hole 61 at the bottom of the floor slab 62 of the shaft body 6.

[0101] Next, the worker stands on the next floor slab 62 and inserts the bolt 7 from the outside of the shaft body 6 through the bolt through hole 61 of the shaft body 6 and the through hole 321 of the connecting plate 32 of the protective platform 1 outward to lock the first nut 8, thereby locking the protective platform 1 to the shaft body 6.

[0102] Finally, disconnect the sling and the shackle 131.

[0103] Operating method for locking the sliding position of the support device 3

[0104] After the protective platform 1 is locked, the user screws the locking bolt 7 into the second threaded hole 311 provided on the surface of the support device 3, so that the end of the locking bolt 7 presses against the surface of the square steel edge 21 on which it is fitted, generating sufficient friction to limit the continued sliding of the support device 3, thereby locking the sliding position of the support device 3.

[0105] Example 4, combined with Figures 8 to 9 As shown, the difference between Example 4 and Example 3 is as follows:

[0106] Example 4 also includes a second nut 9. The head of the bolt 7 is a threaded head 71, and the tail of the bolt 7 is a threaded tail 72. The threaded tail 72 passes through the through hole 321 of the connecting plate 32 and connects to the first nut 8. The threaded head 71 extends out of the bolt through hole 61 of the shaft body 6 and connects to the second nut 9.

[0107] The locking method for the protective platform 1 (using bolt 7, first nut 8 and second nut 9, with the first nut 8 welded to the protective platform 1).

[0108] First, the lifting ring 131 of the protective platform 1 is connected by the sling of the crane. The protective platform 1 is slowly lifted to the corresponding floor slab 62 position by the crane operation, so that the through hole 321 on the connecting plate 32 of the platform 1 is aligned with the bolt through hole 61 at the bottom of the floor slab 62 of the shaft body 6.

[0109] Next, the worker stands on the next floor slab 62 and passes the threaded end 72 of the bolt 7 through the bolt through hole 61 of the shaft body 6 and the through hole 321 of the connecting plate 32 of the protective platform 1 outward from the outside of the shaft body 6 to lock the first nut 8. Then, the worker manually rotates the second nut 9 to lock the threaded head 71 of the bolt 7 that is exposed outside the shaft body 6, so that the protective platform 1 is locked to the shaft body 6.

[0110] Finally, disconnect the sling and the shackle 131.

Claims

1. A guard platform for use in a building elevator shaft, comprising a platform and a support means, characterised in that: The platform comprises a frame, a primary square steel beam, a secondary square steel beam and a floor, the frame comprises a square steel side beam, and the square steel side beam and the square steel side beam are connected to form the frame; The primary square steel beam is arranged in the frame in a transverse manner, and the secondary square steel beam is arranged in the frame in a vertical manner; The surface of the floor is provided with a lifting ring in a spaced manner, the size of the floor is smaller than the size of the frame, the floor is arranged in the frame and above the primary square steel beam and the secondary square steel beam; The floor, the frame, the primary square steel beam and the secondary square steel beam are connected together by welding; The left side of the platform and the square steel side beam of the frame form a sliding gap, and the right side of the platform and the square steel side beam of the frame form a sliding gap; The supporting device comprises a square steel pipe and a connecting plate, the connecting plate is welded on the square steel pipe, the square steel pipe is sleeved on the square steel side beam close to the sliding gap in a sliding manner, the supporting device slides along the length direction of the square steel side beam, and the connecting plate is above the floor and is provided with a through hole or a first threaded hole through which a bolt passes.

2. A protection platform for use in a building elevator shaft according to claim 1, characterized in that: A reinforcing rib is arranged between the secondary square steel beam at the bottom of the floor and the square steel side beam, and the secondary square steel beam, the reinforcing rib and the square steel side beam are connected together by welding.

3. A safety platform for use in a building elevator shaft according to claim 1, characterized in that: A collection net for receiving garbage is further arranged, hooks are arranged in the sliding gap in a spaced manner, the collection net is provided with a hanging ear, the hanging ear is hooked on the corresponding hook, and the collection net is hooked below the floor.

4. A safety platform for use in a building elevator shaft according to claim 1, characterized in that: A locking bolt is further arranged, a second threaded hole is formed in the surface of the square steel pipe, the locking bolt abuts against the square steel side beam through the second threaded hole, and the sliding position of the supporting device is locked.

5. A safety platform for use in a building elevator shaft according to claim 1, characterized in that: The primary square steel beam is a 40*80mm square steel, the secondary square steel beam is a 50*50mm square steel, the square steel side beam is a 50*50mm square steel, the square steel pipe is a 40*80mm square steel, the wall thickness of the square steel pipe is a 10mm steel plate, the floor is a 1.5mm-3mm patterned steel plate, and the lifting ring is an 18mm round steel lifting ring.

6. A building elevator shaft employing a protective platform for use in a building elevator shaft according to any one of claims 1-5, characterized in that: The elevator shaft body is provided with a bolt through hole corresponding to each floor below; The protective platform is movably arranged in the elevator shaft body, the lifting cable of the lifting machine is connected to the lifting ring of the protective platform, and the lifting machine drives the protective platform to ascend and descend; When the through hole or the first threaded hole of the protective platform and the bolt through hole of the elevator shaft body are aligned, the bolt passes through the bolt through hole, the through hole or the first threaded hole and is connected to the first nut, and the elevator shaft body and the protective platform are locked.

7. A building elevator shaft according to claim 6, characterized in that: The bolt is a 20mm shear-resistant high-strength bolt.

8. The building elevator shaft of claim 6, wherein: The first nut is welded on the connecting plate of the protective platform, and the through hole or the first threaded hole is in communication with the first nut.

9. The building elevator shaft of claim 6, wherein: A second nut is further arranged, the head of the bolt is a threaded head, the tail of the bolt is a threaded tail, the threaded tail is connected to the first nut through the through hole or the first threaded hole of the connecting plate, and the threaded head is connected to the second nut outside the bolt through hole of the elevator shaft body.

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