Anti-falling connecting device for fabricated staircase and mounting platform

Abstract

The invention discloses an anti-falling connecting device for an assembly type stair and a mounting platform, and aims to provide an anti-falling connecting device for an assembly type stair and a mounting platform, which can enable a connecting node of the assembly type stair and the mounting platform to have sliding capacity under the condition that normal use of the assembly type stair is not influenced. Therefore, the adverse effects of earthquake or wind load and the like on the connecting node of the fabricated stair and the mounting platform and a building main body structure are effectively reduced; and meanwhile, the anti-falling connecting device further has the function of preventing the stairs from falling off under the action of a large earthquake. The connecting device comprises a main connecting assembly and an auxiliary connecting assembly. The main connecting assembly comprises a connector cylinder part which is pre-buried in the assembly type stair; the fixed outer cylinder is pre-embedded in a platform beam of the mounting platform; the sliding inner cylinder is arranged in the fixed outer cylinder in a sliding mode, and the sliding inner cylinder is inserted into the connector cylinder piece under the action of the end spring; the auxiliary connecting assembly comprises a sliding anchor head which is arranged in the sliding inner cylinder in a sliding manner; the connecting piece is fixed in the interface cylinder piece; the steel rope is connected with the sliding anchor head and the connecting piece.

Description

Technical Field

[0001] This invention relates to the field of prefabricated staircase technology, and more specifically to a fall-prevention connection device between a prefabricated staircase and an installation platform. Background Technology

[0002] In recent years, with the rapid development of prefabricated buildings, prefabricated stairs have become an important part of prefabricated construction due to their convenient installation advantages, which greatly improves the overall construction efficiency. Among them, the scientific and reasonable construction method in the design of the connection node between the prefabricated stairs and the installation platform plays a key role in weakening the additional support of the prefabricated stairs to the main structure of the building and ensuring its structural stability and safety under earthquake action.

[0003] Currently, the connection nodes between prefabricated stairs and installation platforms mainly use two methods: double fixed hinges and one-end fixed and one-end sliding hinge. For the double fixed hinge connection method, such as using vertical steel bars fixed to support bolts, this strong connection design results in the stairs themselves lacking deformation capacity. When the main building structure undergoes lateral displacement under earthquake or wind loads, the stairs act as diagonal bracing members, bearing shear stress, leading to shearing of the connection node, the risk of stairs falling off, and potentially adverse effects on the beams and columns of the stairwell. For the connection method using a fixed hinge at the top and a sliding hinge at the bottom, the diagonal bracing effect of the stairs on the main structure is eliminated. However, the large inertial force of the stairs can still cause shearing of the lower part of the upper support bolts, posing a risk of shearing or even falling off, thus affecting the stairs' function as an emergency evacuation safety passage.

[0004] For example, Chinese Patent Publication No. CN111535530A, entitled "A Prefabricated Staircase," includes a prefabricated staircase; two installation platforms; a receiving groove formed on the upper surface of each installation platform and located on the side of the installation groove away from the prefabricated staircase; a first reinforcing bar located on the side wall of the receiving groove facing the installation groove; and a second reinforcing bar located at the end of the installation platform away from the prefabricated staircase. By setting the receiving groove, the first reinforcing bar, and the second reinforcing bar, and fixing them by injecting cement mortar into the receiving groove, the prefabricated staircase connection structure is strengthened, making the overall use safer and more durable. However, the connection node between the prefabricated staircase and the installation platform in this application also adopts a strong connection node design. It also suffers from the problem that the staircase itself lacks deformation capacity. When the main structure undergoes lateral displacement under earthquake or wind loads, the staircase acts as a diagonal bracing member to bear shear stress, leading to the risk of the connection node being sheared off, the staircase falling off, and adversely affecting the beams and columns of the stairwell. Summary of the Invention

[0005] The purpose of this invention is to provide a fall-prevention connection device for prefabricated stairs and installation platforms that enables the connection nodes between the prefabricated stairs and the installation platform to have sliding capability without affecting the normal use of the prefabricated stairs, thereby effectively reducing the adverse effects of earthquakes or wind loads on the connection nodes between the prefabricated stairs and the installation platform and the main structure of the building; at the same time, it also has the function of preventing stairs from falling off under the action of a major earthquake.

[0006] The technical solution of this invention is: A fall-prevention connection device for a prefabricated staircase and installation platform includes a main connection component and a secondary connection component. The main connection component includes: Interface cylinders are pre-embedded in prefabricated stairs; The outer cylinder is fixed and pre-embedded in the platform beam of the installation platform; The inner cylinder is slidably disposed within the fixed outer cylinder; The end spring allows the sliding inner cylinder to be inserted into the interface cylinder under the action of the end spring. The secondary connection components include: The sliding anchor head is slidably installed inside the sliding inner cylinder, and an annular stop is provided at the outer end of the sliding inner cylinder; The connector is fixed inside the interface sleeve; The steel cable has one end fixed to the sliding anchor head and the other end fixedly connected to the connector. This design for a fall-prevention connection device between a prefabricated staircase and an installation platform mainly consists of a main connection component and a secondary connection component. During normal use of the prefabricated staircase, the main connection component functions to ensure its proper operation. Simultaneously, under minor seismic forces or horizontal loads, the main connection component allows the staircase to slide horizontally along the axial direction of the fixed outer cylinder (ensuring the connection point between the prefabricated staircase and the installation platform has sliding capability). Combined with the end spring providing elastic force, this allows a portion of the sliding inner cylinder to be inserted into the interface cylinder. Thus, while ensuring the prefabricated staircase's normal operation, it effectively reduces the staircase's bracing effect on the main building structure and effectively reduces the adverse effects of earthquakes or wind loads on the connection point between the prefabricated staircase and the installation platform, as well as the main building structure.

[0007] Under the influence of a major earthquake or when subjected to a large horizontal force, when the staircase slides axially along the fixed outer cylinder beyond the limit distance of the main connecting component, causing the sliding inner cylinder to separate from the interface cylinder, the secondary connecting component is activated and works to hold the staircase in place by steel cables, thus preventing the staircase from falling and the potential safety hazards it may cause.

[0008] Preferably, the main connecting assembly also includes a locking plate. The outer end of the fixed outer cylinder has a slot. When the sliding inner cylinder moves into the fixed outer cylinder, the locking plate can be inserted into the slot. After the locking plate is inserted into the slot, the sliding inner cylinder abuts against the locking plate under the action of the end spring, making the outer end face of the sliding inner cylinder flush with the outer end face of the fixed outer cylinder. After the fixed outer cylinder is aligned with the interface cylinder, the locking plate is pulled out, and the sliding inner cylinder is inserted into the interface cylinder under the action of the end spring. This facilitates the actual installation of the prefabricated staircase. Specifically, during the hoisting process of the prefabricated staircase, the locking plate is first inserted into the slot to make the outer end face of the sliding inner cylinder flush with the outer end face of the fixed outer cylinder, so as to prevent the sliding inner cylinder from extending outside the fixed outer cylinder and affecting the hoisting of the prefabricated staircase. After the prefabricated staircase is hoisted into place and the fixed outer cylinder is aligned with the interface cylinder, the locking plate is pulled out, and the sliding inner cylinder is inserted into the interface cylinder under the action of the end spring, completing the assembly.

[0009] Preferably, there are multiple main connecting components, and each main connecting component is distributed sequentially along the width direction of the prefabricated staircase, with each secondary connecting component corresponding to a main connecting component. This ensures a stable and reliable connection structure between the prefabricated staircase and the installation platform.

[0010] Preferably, the other end of the steel cable is fixedly connected to a compression joint, which is connected to the connector. This facilitates the fixed connection of the other end of the steel cable to the connector.

[0011] Preferably, the pressed cable joint is an open cable joint, and the connector is fixed inside the interface cylinder by welding, riveting, or bolting, or the connector is integrally formed inside the interface cylinder, with the open cable joint fixedly connected to the connector. Thus, during the hoisting of the prefabricated staircase, when the fixed outer cylinder approaches the interface cylinder, the pressed cable joint at the other end of the steel cable can be pulled out and inserted into the interface cylinder, connecting the open cable joint to the connector, thereby fixing the other end of the steel cable to the connector.

[0012] Preferably, the interface cylinder has a pin hole, and the connector is composed of a pin. The pin is removable and inserted into the pin hole, passing through the joint hole of the pressing cable section to fix the other end of the steel cable to the connector. Thus, during the hoisting of the prefabricated staircase, when the outer cylinder is close to the interface cylinder, the pressing cable section at the other end of the steel cable can be pulled out and inserted into the interface cylinder. Then, the pin passes through the pin hole and the joint hole of the pressing cable section, thereby fixing the other end of the steel cable to the connector. To further improve the stability of the pin, it can be welded to the interface cylinder or a retaining ring can be provided at the end of the pin to prevent it from coming out. This facilitates the fixing of the other end of the steel cable to the connector, making the actual installation of the prefabricated staircase easier.

[0013] Preferably, the interface tube is provided with a through hole and a screw hole, and the connector is composed of a connecting bolt. The connecting bolt passes through the through hole and the joint hole of the pressing cable section, and is connected to the screw hole by thread, so that the other end of the steel cable is fixedly connected to the connector.

[0014] Thus, during the hoisting of the prefabricated staircase, once the outer cylinder is close to the interface cylinder, the pressing section of the other end of the steel cable can be pulled out and inserted into the interface cylinder. Then, the connecting bolt passes through the through hole and the joint hole of the pressing section, and connects with the screw hole through threads, thereby fixing the other end of the steel cable to the connector. This facilitates the actual installation of the prefabricated staircase by easily fixing the other end of the steel cable to the connector.

[0015] Preferably, the outer end of the fixed outer cylinder is provided with an outer cylinder annular retaining flange, and the outer wall of the inner end of the sliding inner cylinder is provided with an inner cylinder annular retaining flange. In this way, the sliding stroke of the sliding inner cylinder can be limited, preventing the sliding inner cylinder from coming off the fixed outer cylinder.

[0016] Preferably, the inner surface of the outer cylinder's annular retaining edge is provided with a plurality of circumferentially evenly distributed balls, and the outer circumferential surface of the inner cylinder's annular retaining edge is provided with a plurality of circumferentially evenly distributed balls. The balls on the outer cylinder's annular retaining edge abut against the outer surface of the sliding inner cylinder, and the balls on the inner cylinder's annular retaining edge abut against the inner surface of the fixed outer cylinder. In this way, the sliding friction resistance of the sliding inner cylinder can be effectively reduced, allowing it to slide smoothly within the fixed outer cylinder.

[0017] Preferably, the outer surface of the sliding anchor head is also provided with several circumferentially evenly distributed balls, which abut against the inner surface of the sliding inner cylinder. This effectively reduces the sliding friction resistance of the sliding anchor head, allowing it to slide smoothly within the sliding inner cylinder.

[0018] Preferably, a cable passage is formed between the annular blocks to allow the steel cable to pass through. The steel cable passes through the cable passage. The end of the sliding anchor facing the annular block has a convex anchor cone surface, and the end of the annular block facing the anchor cone surface has a concave cone surface that mates with the anchor cone surface. Thus, after the sliding inner cylinder separates from the interface cylinder, the anchor cone surface of the sliding anchor will abut against the concave cone surface, improving the structural stability of the sliding anchor and enabling the steel cable to hold the staircase in place.

[0019] The beneficial effects of this invention are: Firstly, it does not affect the normal use of the prefabricated staircase. Specifically, during the normal use of the prefabricated staircase, the main connecting components function to ensure that the prefabricated staircase can be used normally.

[0020] Secondly, when subjected to minor seismic action or bearing minor horizontal force, the main connecting components function, enabling the staircase to slide horizontally along the axial direction of the fixed outer cylinder. This effectively reduces the staircase's bracing effect on the main building structure and effectively reduces the adverse effects of earthquakes or wind loads on the connection nodes between the prefabricated staircase and the installation platform, as well as on the main building structure.

[0021] In the event of a major earthquake or significant horizontal force, when the sliding inner cylinder separates from the interface cylinder, the secondary connecting component activates, securing the staircase with steel cables to prevent it from falling and the potential safety hazards it might cause. This enhanced fall protection, utilizing steel cables to address the safety hazard of prefabricated staircases falling, demonstrates a significant advantage in ensuring the safety performance of staircases.

[0022] Thirdly, both the main and auxiliary connection components can be manufactured in the factory through pre-embedding. On-site installation adopts a socket connection and does not require grouting treatment, making construction convenient and fast and greatly improving on-site connection efficiency. Attached Figure Description

[0023] Figure 1 This is a partial structural diagram of the anti-fall connection device between the prefabricated staircase and the installation platform of the present invention in practical application.

[0024] Figure 2 This is a partial structural diagram of the mounting platform of the present invention.

[0025] Figure 3 This is a partial structural diagram of the prefabricated staircase of the present invention.

[0026] Figure 4 This is a schematic diagram of one structure of the fixed outer cylinder of the present invention.

[0027] Figure 5 This is a schematic diagram of a structure of the sliding inner cylinder of the present invention.

[0028] In the picture: Main connecting assembly 1, fixed outer cylinder 1.1, outer cylinder annular retaining edge 1.11, sliding inner cylinder 1.2, inner cylinder annular retaining edge 1.21, interface cylinder 1.3, end spring 1.4, locking plate 1.5, slot 1.6, ball bearing 1.7; Sub-connecting assembly 2, sliding anchor head 2.1, steel cable 2.2, annular stop block 2.3, connector 2.4, and pressed cable joint 2.5; Install platform 3; 4. Prefabricated staircase. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Specific Implementation Example 1, such as Figure 1 As shown, a fall-prevention connection device for a prefabricated staircase and installation platform includes a main connection component 1 and a secondary connection component 2.

[0030] The main connecting assembly 1 includes an interface cylinder 1.3, a fixed outer cylinder 1.1, a sliding inner cylinder 1.2, and an end spring 1.4. The interface cylinder 1.3 is embedded within the prefabricated staircase 4, and its outer end is open. In this embodiment, the outer end of the interface cylinder 1.3 refers to the end of the interface cylinder 1.3 facing the mounting platform 3. The fixed outer cylinder 1.1 is embedded within the platform beam of the mounting platform 3. The outer end of the fixed outer cylinder 1.1 is also open. In this embodiment, the outer end of the fixed outer cylinder 1.1 refers to the end of the fixed outer cylinder 1.1 facing the prefabricated staircase 4. The sliding inner cylinder 1.2 is slidably disposed within the fixed outer cylinder 1.1. The end spring 1.4 is disposed between the inner end of the fixed outer cylinder 1.1 and the sliding inner cylinder 1.2. Under the action of the end spring 1.4, the sliding inner cylinder 1.2 is inserted into the interface cylinder 1.3, that is, the outer end of the sliding inner cylinder 1.2 is inserted into the interface cylinder 1.3 under the action of the end spring 1.4. The outer end of the sliding inner cylinder 1.2 refers to the end of the sliding inner cylinder 1.2 that faces the prefabricated staircase 4.

[0031] The secondary connecting assembly 2 includes a sliding anchor head 2.1, a connector 2.4, and a steel cable 2.2. The sliding anchor head 2.1 is slidably disposed within the sliding inner cylinder 1.2. An annular stop block 2.3 is provided at the outer end of the sliding inner cylinder 1.2, which restricts the sliding stroke of the sliding anchor head 2.1 and prevents the sliding anchor head 2.1 from dislodging from the sliding inner cylinder 1.2. The connector 2.4 is fixed within the interface cylinder 1.3. The steel cable 2.2 is located within the sliding inner cylinder 1.2, with one end fixed to the sliding anchor head 2.1 and the other end fixedly connected to the connector 2.4.

[0032] This embodiment of a fall-prevention connection device for a prefabricated staircase and installation platform mainly consists of two parts: a main connecting component 1 and a secondary connecting component 2. During normal use of the prefabricated staircase 4, the main connecting component 1 functions to ensure its normal operation. Simultaneously, under minor vibration or horizontal force, the main connecting component 1 functions to allow the staircase to slide horizontally along the axial direction of the fixed outer cylinder 1.1 (i.e., the connection node between the prefabricated staircase and the installation platform has sliding capability). Combined with the elastic force provided by the end spring 1.4, a portion of the sliding inner cylinder 1.2 is inserted into the interface cylinder 1.3. This effectively reduces the staircase's bracing effect on the main building structure while ensuring the normal operation of the prefabricated staircase 4, and effectively reduces the adverse effects of earthquakes or wind loads on the connection node between the prefabricated staircase 4 and the installation platform 3 and the main building structure.

[0033] Under the action of a major earthquake or when subjected to a large horizontal force, when the staircase slides more than the limit distance of the main connecting component 1 along the fixed outer cylinder 1.1, causing the sliding inner cylinder 1.2 to separate from the interface cylinder 1.3, the secondary connecting component 2 is activated and plays a role in holding the staircase in place by steel cable 2.2, thus avoiding the staircase falling and the potential safety hazards it may cause.

[0034] Specific embodiment two, such as Figures 1-5 As shown, a fall-prevention connection device for a prefabricated staircase and an installation platform includes a main connection component 1 and a secondary connection component 2. The upper and lower ends of the prefabricated staircase 4 are connected to the corresponding installation platform 3 via the main connection component 1 and the secondary connection component 2.

[0035] There are multiple main connecting components 1 between the upper end of the prefabricated staircase 4 and the corresponding installation platform 3, for example, 2-4 main connecting components 1, and each main connecting component 1 is distributed sequentially along the width direction of the prefabricated staircase 4. The secondary connecting components 2 correspond one-to-one with the main connecting components 1. In this embodiment, there are two main connecting components 1 between the upper end of the prefabricated staircase 4 and the corresponding installation platform 3, with one main connecting component 1 closer to one side of the prefabricated staircase 4 and the other main connecting component 1 closer to the other side of the prefabricated staircase 4. This ensures a stable and reliable connection structure between the prefabricated staircase 4 and the installation platform 3.

[0036] There are multiple main connecting components 1 between the lower end of the prefabricated staircase 4 and the corresponding installation platform 3, for example, 2-4 main connecting components 1, and each main connecting component 1 is distributed sequentially along the width direction of the prefabricated staircase 4. The secondary connecting components 2 correspond one-to-one with the main connecting components 1. In this embodiment, there are two main connecting components 1 between the lower end of the prefabricated staircase 4 and the corresponding installation platform 3, with one main connecting component 1 closer to one side of the prefabricated staircase 4 and the other main connecting component 1 closer to the other side of the prefabricated staircase 4. This ensures a stable and reliable connection structure between the prefabricated staircase 4 and the installation platform 3.

[0037] The main connecting assembly 1 includes an interface cylinder 1.3, a fixed outer cylinder 1.1, a sliding inner cylinder 1.2, a locking plate 1.5, and an end spring 1.4.

[0038] The interface cylinder 1.3 is pre-embedded in the prefabricated staircase 4. The outer end of the interface cylinder 1.3 is open. In this embodiment, the outer end of the interface cylinder 1.3 refers to the end of the interface cylinder 1.3 facing the mounting platform 3. The interface cylinder 1.3 is horizontally distributed.

[0039] The fixed outer cylinder 1.1 is embedded in the platform beam of the installation platform 3. The outer end of the fixed outer cylinder 1.1 is open. In this embodiment, the outer end of the fixed outer cylinder 1.1 refers to the end of the fixed outer cylinder 1.1 facing the prefabricated staircase 4. The fixed outer cylinder 1.1 is horizontally distributed. The outer end face of the fixed outer cylinder 1.1 is flush with the side of the installation platform 3, or the outer end face of the fixed outer cylinder 1.1 is close to the side of the installation platform 3.

[0040] The sliding inner cylinder 1.2 is slidably disposed within the fixed outer cylinder 1.1. The inner wall of the fixed outer cylinder 1.1 is provided with an outer cylinder limiting member, and the outer wall of the sliding inner cylinder 1.2 is provided with an inner cylinder limiting member. The outer cylinder limiting member and the inner cylinder limiting member cooperate to restrict the sliding stroke of the sliding inner cylinder 1.2 and prevent the sliding inner cylinder 1.2 from detaching from the fixed outer cylinder 1.1. Specifically, the outer end of the fixed outer cylinder 1.1 is provided with an outer cylinder annular retaining flange 1.11, which constitutes the outer cylinder limiting member; the inner end of the sliding inner cylinder 1.2 is provided with an inner cylinder annular retaining flange 1.21, which constitutes the inner cylinder limiting member. In this way, the sliding stroke of the sliding inner cylinder 1.2 can be restricted, preventing the sliding inner cylinder 1.2 from detaching from the fixed outer cylinder 1.1.

[0041] An end spring 1.4 is positioned between the inner end of the fixed outer cylinder 1.1 and the sliding inner cylinder 1.2. Under the action of the end spring 1.4, the sliding inner cylinder 1.2 is inserted into the interface cylinder 1.3; that is, the outer end of the sliding inner cylinder 1.2 is inserted into the interface cylinder 1.3 under the action of the end spring 1.4. The outer end of the sliding inner cylinder 1.2 refers to the end of the sliding inner cylinder 1.2 facing the prefabricated staircase 4.

[0042] The outer end of the fixed outer cylinder 1.1 is provided with a slot 1.6. There may be one or more slots 1.6 at the outer end of the fixed outer cylinder 1.1. In this embodiment, the outer end of the fixed outer cylinder 1.1 is provided with two symmetrically distributed slots 1.6, with the openings of the two slots 1.6 at the same outer end of the fixed outer cylinder 1.1 facing each other. The slots 1.6 extend vertically and are open at both ends.

[0043] After the sliding inner cylinder 1.2 moves into the fixed outer cylinder 1.1, the locking piece 1.5 can be inserted into the slot 1.6. Specifically, after the sliding inner cylinder 1.2 moves into the fixed outer cylinder 1.1, the locking piece 1.5 can be inserted into the two slots 1.6 at the outer end of the fixed outer cylinder 1.1. After the locking piece 1.5 is inserted into the slots 1.6, the sliding inner cylinder 1.2, under the action of the end spring 1.4, abuts against the locking piece 1.5, making the outer end face of the sliding inner cylinder 1.2 flush with the outer end face of the fixed outer cylinder 1.1. After the fixed outer cylinder 1.1 is aligned with the interface cylinder 1.3, the locking piece 1.5 is pulled out. At this time, a part of the sliding inner cylinder 1.2 is inserted into the interface cylinder 1.3 under the action of the end spring 1.4. This facilitates the actual installation of the prefabricated staircase 4. Specifically, during the hoisting process of the prefabricated staircase 4, the locking plate 1.5 is first inserted into the slot 1.6 so that the outer end face of the sliding inner cylinder 1.2 is flush with the outer end face of the fixed outer cylinder 1.1, so as to prevent the sliding inner cylinder 1.2 from extending out of the fixed outer cylinder 1.1 and affecting the hoisting of the prefabricated staircase 4; after the prefabricated staircase 4 is hoisted into place and the fixed outer cylinder 1.1 is aligned with the interface cylinder 1.3, the locking plate 1.5 is pulled out so that a part of the sliding inner cylinder 1.2 is inserted into the interface cylinder 1.3 under the action of the end spring 1.4, thus completing the assembly.

[0044] The secondary connecting assembly 2 includes a sliding anchor head 2.1, a connector 2.4, and a steel cable 2.2. The sliding anchor head 2.1 is slidably disposed within the sliding inner cylinder 1.2. An annular stop block 2.3 is provided at the outer end of the sliding inner cylinder 1.2, which restricts the sliding stroke of the sliding anchor head 2.1 and prevents the sliding anchor head 2.1 from dislodging from the sliding inner cylinder 1.2. The connector 2.4 is fixed within the interface cylinder 1.3. The steel cable 2.2 is located within the sliding inner cylinder 1.2, with one end fixed to the sliding anchor head 2.1 and the other end fixedly connected to the connector 2.4.

[0045] In this embodiment, a compression joint 2.5 is fixedly connected to the other end of the steel cable 2.2, and the compression joint 2.5 is connected to the connector 2.4. This facilitates the fixed connection of the other end of the steel cable 2.2 to the connector 2.4. Specifically, In one implementation, such as Figure 1 , Figure 3 As shown in Figure 5, the pressed cable joint 2.5 is an open cable joint, and the connector 2.4 is directly fixed inside the interface cylinder 1.3. For example, the connector 2.4 is fixed inside the interface cylinder 1.3 by welding, riveting, or bolting, or the connector 2.4 is integrally formed inside the interface cylinder 1.3. The open cable joint is fixedly connected to the connector 2.4. Thus, during the hoisting of the prefabricated staircase 4, when the fixed outer cylinder 1.1 approaches the interface cylinder 1.3, the pressed cable joint 2.5 at the other end of the steel cable 2.2 can be pulled out and inserted into the interface cylinder 1.3, connecting the open cable joint to the connector 2.4, thereby fixing the other end of the steel cable 2.2 to the connector 2.4.

[0046] In another embodiment, the connector 2.4 is directly fixed inside the interface cylinder 1.3. For example, the connector 2.4 is fixed inside the interface cylinder 1.3 by welding, riveting, or bolting, or the connector 2.4 is integrally formed inside the interface cylinder 1.3. The pressed cable section 2.5 is provided with a hook, for example, a locking hook, which is hooked onto the connector 2.4. Thus, during the hoisting process of the prefabricated staircase 4, when the fixed outer cylinder 1.1 approaches the interface cylinder 1.3, the pressed cable section 2.5 at the other end of the steel cable 2.2 can be pulled out and inserted into the interface cylinder 1.3, and the locking hook can be hooked onto the connector 2.4, thereby fixing the other end of the steel cable 2.2 to the connector 2.4. This facilitates the fixing of the other end of the steel cable 2.2 to the connector 2.4 for assembly. In the third embodiment, the interface cylinder 1.3 is provided with a pin hole, which penetrates the outer top and bottom surfaces of the interface cylinder 1.3. The upper surface of the prefabricated staircase is provided with mounting holes corresponding to the interface cylinders, and the mounting holes are aligned with the pin holes. The connector 2.4 is composed of a pin. The pin is removable and inserted into the pin hole. The compression joint 2.5 is provided with a joint hole. The pin passes through the joint hole of the compression joint 2.5 to fix the other end of the steel cable 2.2 to the connector 2.4. Thus, during the hoisting of the prefabricated staircase 4, when the fixed outer cylinder 1.1 approaches the interface cylinder 1.3, the compression joint 2.5 at the other end of the steel cable 2.2 can be pulled out and inserted into the interface cylinder 1.3, and then the pin passes through the mounting hole, the pin hole, and the joint hole of the compression joint 2.5 to fix the other end of the steel cable 2.2 to the connector 2.4. To further improve the stability of the pin, it can be welded to the interface sleeve 1.3 to prevent it from coming out. This allows the other end of the steel cable 2.2 to be easily fixedly connected to the connector 2.4, facilitating the actual installation of the prefabricated staircase 4.

[0047] In the fourth embodiment, the interface cylinder 1.3 is provided with a through hole and a screw hole. The through hole is located on the upper part of the side wall of the interface cylinder 1.3, and the screw hole is located on the lower part of the side wall of the interface cylinder 1.3. The upper surface of the prefabricated staircase is provided with mounting through holes corresponding to the interface cylinders, and the mounting through holes are aligned with the pin holes. The pressing cable joint 2.5 is provided with a joint hole. The connector 2.4 is composed of a connecting bolt. The connecting bolt passes through the through hole and the joint hole of the pressing cable joint 2.5, and is threadedly connected to the screw hole, so that the other end of the steel cable 2.2 is fixedly connected to the connector 2.4. Thus, during the hoisting process of the prefabricated staircase 4, when the fixed outer cylinder 1.1 approaches the interface cylinder 1.3, the pressing cable joint 2.5 at the other end of the steel cable 2.2 can be pulled out and inserted into the interface cylinder 1.3. Then, the connecting bolt passes through the mounting through hole, the through hole, and the joint hole of the pressing cable joint 2.5, and is threadedly connected to the screw hole, so that the other end of the steel cable 2.2 is fixedly connected to the connector 2.4. In this way, the other end of the steel cable 2.2 can be easily fixedly connected to the connector 2.4, so as to facilitate the actual installation of the prefabricated staircase 4.

[0048] Of course, the other end of the steel cable 2.2 can also be fixedly connected to the connector 2.4 by other existing methods.

[0049] The specific use of the fall-prevention connection device between the prefabricated staircase and the installation platform in this embodiment during the installation of the prefabricated staircase 4 is as follows. Move the sliding inner cylinder 1.2 into the fixed outer cylinder 1.1, and the locking piece 1.5 can be inserted into the two slots 1.6 at the outer end of the fixed outer cylinder 1.1; at this time, the sliding inner cylinder 1.2 abuts against the locking piece 1.5 under the action of the end spring 1.4, so that the outer end face of the sliding inner cylinder 1.2 is flush with the outer end face of the fixed outer cylinder 1.1; to prevent the sliding inner cylinder 1.2 from extending out of the fixed outer cylinder 1.1, which would affect the subsequent hoisting of the prefabricated staircase 4; For initial hoisting, the prefabricated staircase 4 is lifted to a position close to the top of the installation platform 3. The steel cables 2.2 of each connecting component 2 at the upper end of the prefabricated staircase 4 are pulled out, and the pressing joints 2.5 at the other end of the steel cables 2.2 are inserted into the corresponding interface cylinders 1.3 of the installation platform 3, thus fixing the other end of the steel cables 2.2 to the corresponding connectors 2.4. Similarly, the steel cables 2.2 of each connecting component 2 at the lower end of the prefabricated staircase 4 are pulled out, and the pressing joints 2.5 at the other end of the steel cables 2.2 are inserted into the corresponding interface cylinders 1.3 of the installation platform 3, thus fixing the other end of the steel cables 2.2 to the corresponding connectors 2.4.

[0050] Precisely hoist the prefabricated staircase 4. During this process, adjust the state of the steel cables 2.2 of each auxiliary connecting component 2 so that the sliding anchor head 2.1 moves into the sliding inner cylinder 1.2. When the fixed outer cylinder 1.1 is aligned with the interface cylinder 1.3, then pull out the locking plates 1.5 of each main connecting component 1 to release the locking of the sliding inner cylinder 1.2. At this time, a part of each sliding inner cylinder 1.2 is inserted into the corresponding interface cylinder 1.3 under the action of the end spring 1.4. Finally, after verifying that the installation gap between the prefabricated staircase 4 and the installation platform 3 meets the requirements, the installation of the prefabricated staircase 4 is completed, and the installation is finished.

[0051] This embodiment of a fall-prevention connection device for a prefabricated staircase and installation platform mainly consists of two parts: a main connecting component 1 and a secondary connecting component 2. During normal use of the prefabricated staircase 4, the main connecting component 1 functions to ensure its normal operation. Simultaneously, under minor vibration or horizontal force, the main connecting component 1 functions to allow the staircase to slide horizontally along the axial direction of the fixed outer cylinder 1.1. This, combined with the elastic force provided by the end spring 1.4, allows a portion of the sliding inner cylinder 1.2 to be inserted into the interface cylinder 1.3. Thus, while ensuring the normal operation of the prefabricated staircase 4, it effectively reduces the staircase's diagonal bracing effect on the main building structure and effectively reduces the adverse effects of earthquakes or wind loads on the connection node between the prefabricated staircase 4 and the installation platform 3, as well as on the main building structure.

[0052] Under the action of a major earthquake or when subjected to a large horizontal force, when the staircase slides more than the limit distance of the main connecting component 1 along the fixed outer cylinder 1.1, causing the sliding inner cylinder 1.2 to separate from the interface cylinder 1.3, the secondary connecting component 2 is activated and plays a role in holding the staircase in place by steel cable 2.2, thus avoiding the staircase falling and the potential safety hazards it may cause.

[0053] In this embodiment, both the main connecting component 1 and the secondary connecting component 2 can be manufactured in the factory by pre-embedding. On-site installation adopts a socket connection and does not require grouting treatment, making construction convenient and fast, and greatly improving on-site connection efficiency.

[0054] Furthermore, such as Figure 1 As shown, a cable passage is formed between the annular blocks 2.3 for the steel cable 2.2 to pass through. The end of the sliding anchor head 2.1 facing the annular block 2.3 is a protruding anchor head cone surface. The end of the annular block 2.3 facing the anchor head cone surface is a concave cone surface that mates with the anchor head cone surface. Thus, after the sliding inner cylinder 1.2 separates from the interface cylinder 1.3, the anchor head cone surface of the sliding anchor head 2.1 will abut against the concave cone surface, which can improve the structural stability of the sliding anchor head 2.1 and hold the staircase in place by the steel cable 2.2.

[0055] Furthermore, such as Figure 4, Figure 5 As shown, the inner surface of the outer cylinder annular retaining edge 1.11 is provided with a plurality of circumferentially evenly distributed balls 1.7, for example, 3-6 circumferentially evenly distributed balls 1.7 are provided on the inner surface of the outer cylinder annular retaining edge 1.21. The outer circumferential surface of the inner cylinder annular retaining edge 1.21 is provided with a plurality of circumferentially evenly distributed balls 1.7, for example, 3-6 circumferentially evenly distributed balls 1.7 are provided on the outer circumferential surface of the inner cylinder annular retaining edge 1.21. The balls 1.7 on the outer cylinder annular retaining edge 1.11 abut against the outer surface of the sliding inner cylinder 1.2, and the balls 1.7 on the inner cylinder annular retaining edge 1.21 abut against the inner surface of the fixed outer cylinder 1.1. In this way, the sliding friction resistance of the sliding inner cylinder 1.2 can be effectively reduced, allowing it to slide smoothly within the fixed outer cylinder 1.1.

[0056] The outer surface of the sliding anchor head 2.1 is also provided with several circumferentially evenly distributed balls 1.7. For example, the outer surface of the moving anchor head is provided with 3-6 circumferentially evenly distributed balls 1.7. The balls 1.7 on the sliding anchor head 2.1 abut against the inner surface of the sliding inner cylinder 1.2. In this way, the sliding friction resistance of the sliding anchor head 2.1 can be effectively reduced, allowing it to slide smoothly within the sliding inner cylinder 1.2.

[0057] Furthermore, an inner annular groove is provided on the inner wall of the fixed outer cylinder 1.1, and the inner annular groove is close to the outer end of the fixed outer cylinder 1.1. In this embodiment, the inner annular groove is provided on the inner side of the annular flange 1.11 of the outer cylinder, and the ball bearing 1.7 on the annular flange 1.11 of the outer cylinder is located inside the inner annular groove. An inner sealing ring is fixed in the inner annular groove. The inner sealing ring forms a sliding sealing structure between the fixed outer cylinder 1.1 and the sliding inner cylinder 1.2.

[0058] An outer annular groove is provided on the outer surface of the sliding inner cylinder 1.2, near the outer end of the sliding inner cylinder 1.2. An outer sealing ring is fixed inside the outer annular groove. When the outer end of the sliding inner cylinder 1.2 is inserted into the interface cylinder 1.3, the outer sealing ring seals the sliding inner cylinder 1.2 and the interface cylinder 1.3. Thus, by forming a sliding seal structure between the fixed outer cylinder 1.1 and the sliding inner cylinder 1.2 through the inner sealing ring, and a sealing structure between the sliding inner cylinder 1.2 and the interface cylinder 1.3 through the outer sealing ring, water can be prevented from entering the fixed outer cylinder 1.1 and the interface cylinder 1.3.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A fall-prevention connection device for prefabricated stairs and installation platforms, characterized in that, It includes a main connection component and a secondary connection component. The main connection component includes: Interface cylinders are pre-embedded in prefabricated stairs; The outer cylinder is fixed and pre-embedded in the platform beam of the installation platform; The inner cylinder is slidably disposed within the fixed outer cylinder; The end spring allows the sliding inner cylinder to be inserted into the interface cylinder under the action of the end spring. The secondary connection components include: The sliding anchor head is slidably installed inside the sliding inner cylinder, and an annular stop is provided at the outer end of the sliding inner cylinder; The connector is fixed inside the interface sleeve; The steel cable has one end fixed to the sliding anchor head and the other end fixedly connected to the connector.

2. The anti-fall connection device for prefabricated stairs and installation platforms according to claim 1, characterized in that, The main connecting assembly also includes a locking piece. The outer end of the fixed outer cylinder is provided with a slot. When the sliding inner cylinder moves into the fixed outer cylinder, the locking piece can be inserted into the slot. When the locking piece is inserted into the slot, the sliding inner cylinder abuts against the locking piece under the action of the end spring, so that the outer end face of the sliding inner cylinder is flush with the outer end face of the fixed outer cylinder. After aligning the outer cylinder with the interface cylinder, pull out the locking piece. At this time, the sliding inner cylinder is inserted into the interface cylinder under the action of the end spring.

3. The anti-fall connection device for prefabricated stairs and installation platforms according to claim 1, characterized in that, There are multiple main connecting components, and each main connecting component is distributed sequentially along the width direction of the prefabricated staircase. The secondary connecting components correspond one-to-one with the main connecting components.

4. A fall-prevention connection device for a prefabricated staircase and installation platform according to claim 1, 2, or 3, characterized in that, The other end of the steel cable is fixedly connected to a pressing cable joint, which is connected to a connector.

5. The anti-fall connection device for prefabricated stairs and installation platforms according to claim 4, characterized in that, The pressed cable joint is an open cable joint. The connector is fixed inside the interface cylinder by welding, riveting or bolting, or the connector is integrally formed inside the interface cylinder. The open cable joint is fixedly connected to the connector.

6. The anti-fall connection device for prefabricated stairs and installation platforms according to claim 4, characterized in that, The interface cylinder is provided with a pin hole, and the connector is made of a pin. The pin can be removed and inserted into the pin hole. The pin passes through the joint hole of the pressing cable section so that the other end of the steel cable is fixedly connected to the connector. Alternatively, the interface cylinder is provided with a through hole and a screw hole, and the connector is composed of a connecting bolt. The connecting bolt passes through the through hole and the joint hole of the pressing cable section, and is connected to the screw hole by thread, so that the other end of the steel cable is fixedly connected to the connector.

7. A fall-prevention connection device for a prefabricated staircase and installation platform according to claim 1, 2, or 3, characterized in that, The outer end of the fixed outer cylinder is provided with an outer cylinder annular retaining flange, and the outer wall of the inner end of the sliding inner cylinder is provided with an inner cylinder annular retaining flange.

8. The anti-fall connection device for prefabricated stairs and installation platforms according to claim 7, characterized in that, The inner side of the outer cylinder annular retaining edge is provided with a number of circumferentially evenly distributed balls, and the outer circumferential surface of the inner cylinder annular retaining edge is provided with a number of circumferentially evenly distributed balls. The balls on the outer cylinder annular retaining edge abut against the outer side of the sliding inner cylinder, and the balls on the inner cylinder annular retaining edge abut against the inner side of the fixed outer cylinder.

9. A fall-prevention connection device for a prefabricated staircase and installation platform according to claim 1, 2, or 3, characterized in that, The outer surface of the sliding anchor head is also provided with several circumferentially evenly distributed balls, and the balls on the sliding anchor head abut against the inner surface of the sliding inner cylinder.

10. A fall-prevention connection device for a prefabricated staircase and installation platform according to claim 1, 2, or 3, characterized in that, The annular blocks form a cable passage hole for the steel cable to pass through. The steel cable passes through the cable passage hole. The end of the sliding anchor facing the annular blocks is a protruding anchor cone surface, and the end of the annular blocks facing the anchor cone surface is a concave cone surface that mates with the anchor cone surface.

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