Overhanging discharging platform device based on cable-stayed steel wire rope pull-up point conversion support

Abstract

The invention provides an overhanging discharging platform device based on a pull-up point conversion support of a cable-stayed steel wire rope, which belongs to the technical field of buildings and comprises an overhanging main beam, a rear-end U-shaped pre-embedded anchor ring device, a front-end U-shaped pre-embedded anchor ring device, a discharging platform, the cable-stayed steel wire rope and an anchoring device. The invention provides a safe, economical and reusable conversion support for a pull-up anchoring point of a cable-stayed steel wire rope of a section steel overhanging discharging platform of a newly-built multi-layer or high-rise building. Front-end U-shaped steel bar anchor rings which are pre-embedded on the upper layer and the upper layer of the section steel overhanging discharging platform and are necessary for later installation of a platform main beam are utilized in advance, and the U-shaped steel bar anchor rings are respectively sleeved with a conversion support so that the U-shaped steel bar anchor rings can respectively serve as pull-up anchoring points of a cable-stayed working steel wire rope and a safety steel wire rope of the section steel overhanging discharging platform. The U-shaped steel bar anchor ring has multiple purposes in sequence.

Description

Technical Field

[0001] The present invention relates to the field of construction technology, and particularly to a cantilever unloading platform device based on a conversion support for the upper pull point of a stay cable wire rope. Background Art

[0002] At present, in the construction of the cast-in-place reinforced concrete structure of the main body of a building, the cast-in-place structure of its beam, slab, wall and column generally adopts a steel pipe + wooden formwork support system for construction. After the age of the reinforced concrete structure of the lower several floors meets the formwork removal conditions, the turnover materials such as steel pipes, square timbers and wooden formworks after formwork removal are hoisted to the upper floor to be constructed by a tower crane in batches through the steel section cantilever unloading platform on this floor for continued recycling. On the one hand, the main I-beam of the steel section cantilever unloading platform is installed and fixed by embedding a front-end U-shaped steel bar anchor ring and a rear-end U-shaped steel bar anchor ring in the floor. Both ends of the exposed U-shaped steel bar anchor ring are provided with screw threads of a certain length, and the main I-beam of the steel is locked in the U-shaped anchor ring through a steel pressing plate, a steel gasket and a double-nut. On the other hand, the 4 upper pull anchor points of the stay cable wire ropes (including the outer rope and the inner rope) of the steel section cantilever unloading platform usually need to be on the upper layer and the upper second layer. Each upper pull anchor point of the stay cable wire rope is a specially made steel bar anchor ring. The U-shaped steel bar anchor ring and the steel bar anchor ring are directly cut off and discarded after use, and belong to disposable embedded iron parts. If the number of floors of the proposed building is large or it is a high-rise or even super high-rise building, the number of steel bar anchor rings used for the upper pull anchor points of the stay cable wire ropes of the steel section cantilever unloading platform is large, and the time and cost required for their production, installation and cutting are huge. Therefore, a safe, economical and reusable conversion support is needed for the upper pull anchor points of the stay cable wire ropes of the steel section cantilever unloading platform of newly built multi-storey or high-rise buildings. Summary of the Invention

[0003] The purpose of the present invention is to provide a cantilever unloading platform device based on a conversion support for the upper pull point of a stay cable wire rope, so as to solve the technical problems mentioned in the background art.

[0004] A conversion support that is safe, economical and reusable is needed for the upper pull anchor points of the stay cable wire ropes of the steel section cantilever unloading platform of newly built multi-storey or high-rise buildings. By pre-using the front-end U-shaped steel bar anchor rings that have been embedded in the upper layer and the upper second layer of the steel section cantilever unloading platform and are necessary for the later installation of the main platform beam, a conversion support is sleeved at each of the U-shaped steel bar anchor rings, so that they respectively become the upper pull anchor points of the stay cable working wire rope (also called the outer rope) and the safety wire rope (also called the inner rope) of the steel section cantilever unloading platform on the lower floor, realizing the multi-purpose use of the U-shaped steel bar anchor ring in turn, and there is no need to embed specially made steel bar anchor rings as the upper pull anchor points of the stay cable wire ropes of the steel section cantilever unloading platform, which can reduce the construction time and cost while ensuring safety.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A cantilever unloading platform device based on a conversion support for the upper pulling point of a stay cable steel wire rope, comprising a cantilever main beam, a rear-end U-shaped embedded anchor ring device, a front-end U-shaped embedded anchor ring device, a unloading platform, a stay cable steel wire rope, and an anchoring device. The rear-end U-shaped embedded anchor ring device and the front-end U-shaped embedded anchor ring device are arranged on the floor surface. One end of the cantilever main beam is fixed on the rear-end U-shaped embedded anchor ring device and the front-end U-shaped embedded anchor ring device, and the other end of the cantilever main beam extends out of the floor surface. The unloading platform is arranged at the corresponding end of the cantilever main beam extending out of the floor surface. One end of the stay cable steel wire rope is connected to the corresponding end of the cantilever main beam extending out of the floor surface. The anchoring device is arranged on the concrete beam of the floor surface of a higher floor, and the other end of the stay cable steel wire rope is connected to the anchoring device. The stay cable steel wire rope is arranged obliquely.

[0007] Further, the anchoring device includes a U-shaped embedded anchor ring, a shield-shaped steel plate, an I-beam, a rectangular steel plate, and a steel nut. The U-shaped embedded anchor ring is embedded in the concrete beam. The shield-shaped steel plate passes through the U-shaped embedded anchor ring and is arranged on the floor surface, and extends out of the floor surface. The I-beam is arranged at the upper end of the shield-shaped steel plate. The rectangular steel plate passes through the U-shaped embedded anchor ring and presses on the upper end of the I-beam. The steel nut is threadedly connected to the top end of the U-shaped embedded anchor ring to tighten the rectangular steel plate.

[0008] Further, the stay cable steel wire rope is connected to the shield-shaped steel plate through a wire rope clip.

[0009] Further, a steel gasket is arranged between the nut and the rectangular steel plate, and the connection between the rectangular steel plate and the top of the I-beam is welded to form an integral assembly.

[0010] Further, both the rear-end U-shaped embedded anchor ring device and the front-end U-shaped embedded anchor ring device are pre-embedded in the floor structure concrete in advance, and the number of the rear-end U-shaped embedded anchor ring devices is two.

[0011] Further, when the cantilever unloading platform needs to be replaced to the previous floor, the U-shaped embedded anchor ring on the anchoring device is directly used as the front-end U-shaped embedded anchor ring device.

[0012] Further, the installation process of the cantilever unloading platform device is as follows:

[0013] Step 1: Within the working radius of the tower crane, according to the requirements of the construction plan for the steel structure cantilever unloading platform, first complete the welding or bolting assembly of the platform on the outdoor flat ground, including the platform main beam, secondary beam, bottom plate, railing, and the platform hoisting steel wire rope, platform working steel wire rope, and platform safety steel wire rope are assembled in sequence. Check the integrity and stability of the steel structure cantilever unloading platform and conduct a trial hoisting.

[0014] Step 2: The tower crane hook hooks the platform hoisting steel wire rope. After reaching near the outer frame of the Nth floor surface, temporarily remove the outer frame safety net near the platform to be installed.

[0015] Step 3: The tower crane continuously cooperates to guide the main I-beam of the cantilevered platform to pass through the external scaffold towards the structural floor slab, insert it into and seat it inside the front U-shaped anchor ring and the inner side of the end U-shaped anchor ring on the Nth floor. Adjust the safety clearance between the unloading platform and the outer vertical pole of the external scaffold. Steel pressing plates and steel gaskets are sequentially sleeved on the top of the main I-beam of the cantilevered platform within the positions of the front U-shaped anchor ring and the end U-shaped anchor ring, and double nuts are tightened. The inner side of the U-shaped anchor ring is firmly plugged with wooden wedges to tightly press the main I-beam of the cantilevered platform inside the U-shaped anchor ring;

[0016] Step 4: Keep the tower crane steadily lifting and holding the unloading platform still. For each front U-shaped anchor ring on the (N + 1)th floor and the (N + 2)th floor, a shield-shaped steel plate, an I-beam, a rectangular steel plate and a steel gasket are respectively sleeved and double nuts are tightened to complete the installation of the conversion supports for the upper pulling points of the two inclined stay steel wires on the (N + 1)th floor and the two on the (N + 2)th floor. The upper ends of the working steel wires of the inclined stay on the far sides of both sides of the platform are tied to the orifice plates of the two conversion supports on the (N + 2)th floor. The outer ropes must be tightened upwards so that the outer end of the platform is 20 mm to 30 mm higher than the inner end to ensure that the outer ropes are truly stressed. Then, the safety steel wires of the inclined stay on the near sides of both sides of the platform are tied to the orifice plates of the two conversion supports on the (N + 1)th floor and tensioned and fixed. Once the outer ropes on the (N + 2)th floor break and fail, the inner ropes on the (N + 1)th floor can independently bear the role of stabilizing and stressing the platform;

[0017] Step 8: Only after the two inclined stay steel wires on both sides of the unloading platform are in place and pulled to be stressed can the lifting ropes of the tower crane be withdrawn;

[0018] Step 6: After fully covering the walkway plates in the gap between the innermost I-beam secondary beam of the unloading platform and the outer edge of the building structure, completing the surrounding safety nets and protective railings, organize the acceptance and commissioning of the steel cantilever unloading platform on the Nth floor.

[0019] Further, the process of transferring the steel cantilever unloading platform on the Nth floor to the (N + 1)th floor for continued turnover use is as follows:

[0020] Step 1: First, clean the piled loads, sundries inside the steel cantilever unloading platform on the Nth floor and remove the walkway plates of the platform, etc. Then, after the tower crane hook hooks the lifting steel wire rope of the platform, lift the load-bearing of the unloading platform and sequentially remove the upper connection buckles of the two inclined stay steel wires on both sides of the unloading platform, the double nuts, steel pressing plates and steel gaskets of the front U-shaped anchor ring and the end U-shaped anchor ring of the main cantilever beam of the platform;

[0021] Step 2: Remove the two conversion supports installed on the front U-shaped anchor ring on the (N + 1)th floor and install the two conversion supports on the front U-shaped anchor ring on the (N + 3)th floor,

[0022] Step 3: The tower crane hook hooks the lifting steel wire rope of the platform. After reaching near the external scaffold on the floor of the (N + 1)th floor, temporarily remove the safety net of the external scaffold near the platform to be installed;

[0023] Step 4: The tower crane continues to cooperate to guide the main I-beam of the cantilevered platform to pass through the external scaffold in the direction of the structural floor slab of the (N + 1)-th floor, insert it into and seat it on the inner sides of the front U-shaped anchor ring and the end U-shaped anchor ring of the (N + 1)-th floor. Adjust the safe clear distance between the unloading platform and the outer vertical pole of the external scaffold. Steel pressing plates and steel gaskets are successively sleeved on the top of the main I-beam of the cantilevered platform within the positions of the front U-shaped anchor ring and the end U-shaped anchor ring, and double nuts are tightened. The inner side of the U-shaped anchor ring is firmly plugged with wooden wedges to firmly press the main I-beam of the cantilevered platform into the U-shaped anchor ring;

[0024] Step 5: Keep the tower crane steadily lifting and holding the unloading platform still. Tie the upper ends of the far-side inclined pulling working steel wires (i.e., the outer wires) on both sides of the platform to the steel plate holes of the two conversion supports on the (N + 3)-th floor. The outer wires must be tightened upward to make the outer end of the platform slightly 20 to 30 mm higher than the inner end to ensure that the outer wires are truly stressed. Then, tie the near-side inclined pulling safety steel wires (i.e., the inner wires) on both sides of the platform to the steel plate holes of the two conversion supports on the (N + 2)-th floor and tension and fix them;

[0025] Step 6: Only after the two pairs of inclined pulling steel wires on both sides of the unloading platform are in place and pulled to be stressed can the lifting ropes of the tower crane be withdrawn;

[0026] Step 7: After fully covering the walkway plates in the gap between the innermost I-beam secondary beam of the unloading platform and the outer edge of the building structure, completing the surrounding safety nets and protective railings, organize the acceptance and commissioning of the steel cantilever unloading platform on the (N + 1)-th floor.

[0027] Due to the adoption of the above technical solutions, the present invention has the following beneficial effects:

[0028] The present invention provides a conversion support that is safe, economical, and reusable for the upper pulling anchor points of the inclined pulling steel wires of the steel cantilever unloading platform for newly built multi-story or high-rise buildings. By pre-using the front U-shaped steel bar anchor rings that have been pre-buried on the upper layer and the upper second layer of the steel cantilever unloading platform and are necessary for the later installation of the main platform beam, a conversion support is sleeved at each of these U-shaped steel bar anchor rings to respectively serve as the upper pulling anchor points of the inclined pulling working steel wires and the safety steel wires of the steel cantilever unloading platform, enabling the U-shaped steel bar anchor rings to serve multiple purposes in sequence, eliminating the need to pre-bury special steel bar anchor rings as the upper pulling anchor points of the inclined pulling steel wires of the steel cantilever unloading platform, reducing construction time and cost while ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the side view of the cantilever unloading platform of the present invention;

[0030] Figure 2 is the top view of the cantilever unloading platform of the present invention;

[0031] Figure 3 is the cross-sectional view of the anchoring device of the present invention;

[0032] Figure 4 is the side view of the anchoring device of the present invention;

[0033] Figure 5 is the schematic structural view of the shield-shaped steel plate of the present invention.

[0034] In the attached drawings, A - floor surface, 1 - cantilever main beam, 2 - rear-end U-shaped embedded anchor ring device, 3 - front-end U-shaped embedded anchor ring device, 4 - unloading platform, 5 - stay cable, 6 - wire rope clip, 7 - external scaffolding, 8 - anchoring device, 9 - U-shaped embedded anchor ring, 10 - concrete beam, 11 - shield-shaped steel plate, 12 - I-beam, 13 - rectangular steel plate, 14 - steel gasket, 15 - steel nut. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following provides preferred embodiments with reference to the attached drawings to further elaborate on the present invention in detail. However, it should be noted that many details listed in the description are only for enabling the reader to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0036] As Figure 1-2 shown, a cantilever unloading platform device based on a stay cable upper pulling point conversion support includes a cantilever main beam 1, a rear-end U-shaped embedded anchor ring device 2, a front-end U-shaped embedded anchor ring device 3, an unloading platform 4, a stay cable 5 and an anchoring device 8. The rear-end U-shaped embedded anchor ring device 2 and the front-end U-shaped embedded anchor ring device 3 are arranged on the floor surface A. One end of the cantilever main beam 1 is fixed on the rear-end U-shaped embedded anchor ring device 2 and the front-end U-shaped embedded anchor ring device 3, and the other end of the cantilever main beam 1 extends outside the floor surface A. The unloading platform 4 is arranged on the corresponding end of the cantilever main beam 1 extending outside the floor surface A. One end of the stay cable 5 is connected to the corresponding end of the cantilever main beam 1 extending outside the floor surface A. The anchoring device 8 is arranged on the concrete beam 10 of the floor surface A of a higher floor. The other end of the stay cable 5 is connected to the anchoring device 8, and the stay cable 5 is arranged obliquely.

[0037] In the embodiment of the present invention, as Figure 3-4 shown, the anchoring device 8 includes a U-shaped embedded anchor ring 9, a shield-shaped steel plate 11, an I-beam 12, a rectangular steel plate 13 and a steel nut 15. The U-shaped embedded anchor ring 9 is embedded in the concrete beam 10. The shield-shaped steel plate 11 passes through the U-shaped embedded anchor ring 9 and is arranged on the floor surface 10 and extends out of the floor surface 10. The I-beam 12 is arranged on the upper end of the shield-shaped steel plate 11. The rectangular steel plate 13 passes through the U-shaped embedded anchor ring 9 and presses on the upper end of the I-beam 12. The steel nut 15 is threadedly connected to the top end of the U-shaped embedded anchor ring 9 to tighten the rectangular steel plate 13.

[0038] The pulling point conversion support includes component A, component B and component C; where: Component A includes a shield-shaped steel plate (No. 1) with a cross-section of 220x216x20 mm, and a total of 3 round holes are drilled in the plane of the shield-shaped steel plate (the hole positioning is shown in the drawing of component A). The holes are for the embedded U-shaped steel bar bolts to be sleeved in, and is for the upper end of the inclined pulling steel wire rope to pass through). Component B includes an 18# I-beam with a length of 150 mm (No. 2) and a steel pressing plate with cross-sectional dimensions of 220x100x10 mm (No. 3). Two holes are drilled in the steel pressing plate (the hole positioning is shown in the large drawing of the steel pressing plate (No. 3)). The holes are for the embedded U-shaped steel bar bolts to be sleeved in; one end of the top of the 18# I-beam (No. 2) is flush with one end of the steel pressing plate (No. 3) and is fixed by full welding around, so that the 18# I-beam (No. 2) and the steel pressing plate (No. 3) form an integral component B. Component C includes a steel gasket with a thickness of 5 mm and double nuts (which can be matched with the embedded U-shaped steel bar bolts). In the embodiment of the present invention, the inclined pulling steel wire rope 5 is connected to the shield-shaped steel plate 11 through a steel wire rope clip 6. In the embodiment of the present invention, a steel gasket 14 is arranged between the steel nut 15 and the rectangular steel plate 13, and the connection between the rectangular steel plate 13 and the top of the I-beam 12 is welded to form an integral component.

[0039] In the embodiment of the present invention, the rear-end U-shaped embedded anchor ring device 2 and the front-end U-shaped embedded anchor ring device 3 are both pre-embedded in the floor A in advance, and the number of the rear-end U-shaped embedded anchor ring devices 2 is two.

[0040] In the embodiment of the present invention, when the cantilever unloading platform needs to be replaced to the previous floor, the U-shaped embedded anchor ring 9 on the anchoring device 8 is directly used as the front-end U-shaped embedded anchor ring device 3.

[0041] In the embodiment of the present invention, when the cantilever unloading platform needs to be replaced to the previous floor, the U-shaped embedded anchor ring 9 on the anchoring device 8 is directly used as the front-end U-shaped embedded anchor ring device 3.

[0042] In the embodiment of the present invention, when the cantilever unloading platform needs to be replaced to the previous floor, the U-shaped embedded anchor ring 9 on the anchoring device 8 is directly used as the front-end U-shaped embedded anchor ring device 3.

[0043] It is assumed that the steel cantilever unloading platform is to be installed on the Nth, N+1th, N+2th, ..., N+nth floors. Therefore, during the construction of the reinforced concrete structural beam-slab on the Nth, N+1th, N+2th, ..., N+nth floors, considering the installation and anchoring requirements of the two cantilever I-steel main beams of the steel cantilever unloading platform in the future, a set of U-shaped threaded U-shaped steel bar anchor rings (hereinafter referred to as the front-end U-shaped anchor rings) are pre-buried 100 mm away from the sealing beam at the front end of the installation position of each parallel cantilever I-steel main beam on each floor, and two sets of U-shaped steel bar anchor rings with a spacing of 200 mm are pre-buried not less than 200 mm away from the end of the cantilever I-steel (hereinafter referred to as the end U-shaped anchor rings). Usually, the thickness of the cast-in-place reinforced concrete floor slab is 100-120 mm, and the two I-steel main beams of the steel cantilever unloading platform are both 18# I-steel with a length of 6 m. The front-end U-shaped anchor rings are bent into U-shaped steel bar anchor rings (450 + 120 (inner clearance) + 450 mm) with a diameter of 18 mm round steel with threaded ends (threaded length is about 100 mm), and the end U-shaped anchor rings are bent into U-shaped steel bar anchor rings (350 + 120 (inner clearance) + 350 mm) with a diameter of 18 mm round steel with threaded ends (threaded length is about 100 mm). That is, during the construction of the reinforced concrete structural beam-slab on the Nth, N+1th, N+2th, ..., N+nth floors, the front-end U-shaped anchor rings and the end U-shaped anchor rings are pre-buried at the position of each parallel cantilever I-steel main beam on each floor according to the conventional requirements along with the progress of the floor slab construction.

[0044] Installation process of the steel cantilever unloading platform on the Nth floor: 1. Within the working radius of the tower crane, according to the requirements of the construction plan of the steel cantilever unloading platform, first complete the welding or bolting assembly of the platform on the outdoor flat ground, including the main beam, secondary beam, bottom plate, railing of the platform, and the hoisting steel wire rope, working steel wire rope (also called the outer rope) and safety steel wire rope (also called the inner rope) of the platform are assembled in sequence. Check the integrity and stability of the steel cantilever unloading platform and conduct a trial lift. 2. The tower crane hook hooks the hoisting steel wire rope of the platform. After reaching near the outer frame on the Nth floor, temporarily remove the safety net of the outer frame near the platform to be installed. 3. The tower crane continuously cooperates to guide the cantilever I-steel main beam of the platform to pass through the outer frame towards the structural floor slab, slip on and sit on the inner sides of the front-end U-shaped anchor rings and end U-shaped anchor rings on the Nth floor, adjust the safe clearance between the unloading platform and the outer vertical pole of the outer frame. Steel pressing plates and steel gaskets are sequentially slipped on the top of the cantilever I-steel main beam of the platform within the positions of the front-end U-shaped anchor rings and end U-shaped anchor rings and tighten the double nuts. Wedges are firmly plugged inside the U-shaped anchor rings to firmly press the cantilever platform I-steel main beam inside the U-shaped anchor rings. 4. Keep the tower crane steadily lifting and holding the unloading platform still. At each front-end U-shaped anchor ring on the N+1th and N+2th floors, respectively slip on the A component (shield-shaped steel plate Align the holes towards the outer frame direction), the B component and the C component, and tighten the double nuts to complete the installation of the conversion supports for the upper pull points of the two inclined stay steel wires on the N+1st floor and the two on the N+2nd floor. Tie the upper ends of the far-side inclined stay working steel wires (i.e., the outer wires) on both sides of the platform to the two conversion supports on the N+2nd floor on the orifice plate. The outer wires must be tightened upwards so that the outer end of the platform is 20 to 30 mm higher than the inner end to ensure that the outer wires are truly stressed. Then, tie the near-side inclined stay safety steel wires (i.e., the inner wires) on both sides of the platform to the two conversion supports on the orifice plate and tension and stabilize them. Once the outer wires (working wires) break and fail, the inner wires (safety wires) can independently bear the force of stabilizing the platform. 5. Only after the two inclined stay steel wires on both sides of the unloading platform are in place and pulled to bear force can the lifting ropes of the tower crane be withdrawn. 6. After fully covering the walkway plates in the gap between the innermost I-beam secondary beam of the unloading platform and the outer edge of the building structure, completing the surrounding safety nets and protective railings, organize the acceptance and commissioning of the Nth floor steel structure cantilever unloading platform.

[0045] The process of transferring the N-layer steel cantilever unloading platform to the N+1 layer for continued circulation: 1. First, clean up the stacked objects and debris in the N-layer steel cantilever unloading platform and remove the platform walkway board, etc. Then, after the tower crane hook hooks the platform lifting wire rope, slightly lift the unloading platform load-bearing, and successively remove the upper end connecting buckles (including inner and outer ropes) of the two inclined wire ropes on both sides of the unloading platform and the front end U-shaped anchor ring of the platform cantilever main beam, the double nuts of the end U-shaped anchor ring, steel pressure plate and steel gasket, etc. 2. Remove the two conversion supports installed on the front end U-shaped anchor ring of the N+1 layer, and install the above two conversion supports on the front end U-shaped anchor ring of the N+3 layer. 3. After the tower crane hook hooks the platform lifting wire rope and reaches the vicinity of the floor external frame of the N+1 layer, temporarily remove the external frame safety net near the platform to be installed. 4. The tower crane keeps cooperating to guide the platform cantilever I-beam main beam to pass through the external frame towards the structural floor of the N+1th floor, and is inserted into and located inside the front U-shaped anchor ring and the end U-shaped anchor ring of the N+1th floor. The safe net distance between the unloading platform and the external uprights of the external frame is adjusted. The steel pressure plate and steel gasket are inserted into the top of the platform cantilever I-beam main beam in the position of the front U-shaped anchor ring and the end U-shaped anchor ring in turn, and the double nuts are tightened. The inside of the U-shaped anchor ring is firmly plugged with a wooden wedge to firmly press the I-beam main beam of the cantilever platform into the U-shaped anchor ring. 5. Keep the tower crane steady and hold the unloading platform still. Tie the upper ends of the oblique working wire ropes (i.e., outer ropes) on the far sides of the platform to the two holes of the conversion support steel plates on the N+3 layer. The outer ropes must be pulled upwards to make the outer end of the platform slightly higher than the inner end by 20 to 30 mm to ensure that the outer ropes are truly stressed. Then, tie the oblique safety wire ropes (i.e., inner ropes) on the near sides of the platform to the two holes of the conversion support steel plates on the N+2 layer and tension them firmly. 6. Only after the two oblique wire ropes on both sides of the unloading platform are in place and pulled up to bear the stress, can the tower crane's hoisting ropes be evacuated. 7. After fully paving the walkway slabs in the gap between the innermost I-beam secondary beam of the unloading platform and the outer edge of the building structure, and completing the surrounding safety nets and guardrails, organize the acceptance and commissioning of the N+1 layer steel cantilever unloading platform.

[0046] The front end U-shaped anchor rings that were originally used only for the I-beam main beam of the cantilever unloading platform and pre-buried on the upper and second floors are used to be inserted into and installed on the rotatable conversion support of the present invention, so that they can respectively become the upper pull anchor points of the inclined working wire rope and the safety wire rope of the steel cantilever unloading platform, so that the U-shaped steel bar anchor ring can be used for multiple purposes in turn, without the need to pre-buried special The steel anchor ring serves as the pulling anchor point for the inclined steel wire rope of the steel cantilever unloading platform, ensuring safe early lowering and reducing construction time and cost.

[0047] Matters not covered by the present invention are known technologies.

[0048] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A cantilever unloading platform device based on a conversion support for the upper pulling point of a stay cable steel wire rope, characterized in that: It includes a cantilever main beam (1), a rear U-shaped pre-embedded anchor ring device (2), a front U-shaped pre-embedded anchor ring device (3), a discharging platform (4), a stay cable (5) and an anchoring device (8). The rear U-shaped pre-embedded anchor ring device (2) and the front U-shaped pre-embedded anchor ring device (3) are arranged on the floor slab (A). One end of the cantilever main beam (1) is fixed on the rear U-shaped pre-embedded anchor ring device (2) and the front U-shaped pre-embedded anchor ring device (3). The other end of the cantilever main beam (1) extends outside the floor slab (A). The discharging platform (4) is arranged on the corresponding end of the cantilever main beam (1) that extends outside the floor slab (A). One end of the stay cable (5) is connected to the corresponding end of the cantilever main beam (1) that extends outside the floor slab (A). The anchoring device (8) is arranged on the concrete beam (10) of the floor slab (A) on a higher floor. The other end of the stay cable (5) is connected to the anchoring device (8). The stay cable (5) is arranged obliquely.

2. The overhanging discharging platform device based on the stay cable upper pulling point conversion support according to claim 1, characterized in that: The anchoring device (8) includes a U-shaped pre-embedded anchor ring (9), a shield-shaped steel plate (11), an I-beam (12), a rectangular steel plate (13) and a steel nut (15). The U-shaped pre-embedded anchor ring (9) is pre-embedded in the concrete beam (10). The shield-shaped steel plate (11) passes through the U-shaped pre-embedded anchor ring (9) and is arranged on the floor slab (10), and extends out of the floor slab (10). The I-beam (12) is arranged at the upper end of the shield-shaped steel plate (11). The rectangular steel plate (13) passes through the U-shaped pre-embedded anchor ring (9) and presses on the upper end of the I-beam (12). The steel nut (15) is threadedly connected to the top end of the U-shaped pre-embedded anchor ring (9) to tighten the rectangular steel plate (13).

3. The overhanging discharging platform device based on the stay cable upper pulling point conversion support according to claim 2, characterized in that: The stay cable (5) is connected to the shield-shaped steel plate (11) through a wire rope clip (6).

4. The cantilevered discharging platform device based on the stay cable upper pulling point conversion support according to claim 2, characterized in that: A steel gasket (14) is arranged between the steel nut (15) and the rectangular steel plate (13). The connection between the rectangular steel plate (13) and the top of the I-beam (12) is welded and forms an integral assembly.

5. The overhanging unloading platform device based on the stay cable upper pull point conversion support according to claim 1, characterized in that: Both the rear U-shaped pre-embedded anchor ring device (2) and the front U-shaped pre-embedded anchor ring device (3) are pre-embedded in the floor slab (A) in advance. The number of the rear U-shaped pre-embedded anchor ring devices (2) is two.

6. The overhanging discharging platform device based on the stay cable upper pulling point conversion support according to claim 1, characterized in that: When the cantilever discharging platform needs to be replaced to the previous floor, the U-shaped pre-embedded anchor ring (9) on the anchoring device (8) is directly used as the front U-shaped pre-embedded anchor ring device (3).

7. The overhanging discharging platform device based on the stay cable upper pulling point conversion support according to claim 1, characterized in that: The installation process of the cantilever discharging platform device is as follows: Step 1: Within the working radius of the tower crane, according to the requirements of the construction plan for the steel beam cantilever discharging platform, first complete the welding or bolting assembly of the platform on the outdoor flat ground, including the main beam, secondary beam, bottom plate, railing of the platform, and the platform hoisting wire rope, platform working wire rope and platform safety wire rope are assembled in sequence. Check the integrity and stability of the steel beam cantilever discharging platform and conduct a trial lift. Step 2: The tower crane hook hooks the platform hoisting wire rope. After reaching near the outer frame of the Nth floor slab, temporarily remove the outer frame safety net near the platform to be installed. Step 3: The tower crane continues to cooperate to guide the main I-beam of the cantilevered platform to pass through the external scaffold towards the structural floor slab, insert it into and seat it inside the front U-shaped anchor ring and the inner side of the end U-shaped anchor ring on the Nth floor. Adjust the safety clearance between the unloading platform and the outer vertical pole of the external scaffold. Successively sleeve steel pressing plates and steel gaskets on the top of the main I-beam of the cantilevered platform within the positions of the front U-shaped anchor ring and the end U-shaped anchor ring and tighten the double nuts. Wedge the inner side of the U-shaped anchor ring firmly with wooden wedges to firmly press the main I-beam of the cantilevered platform inside the U-shaped anchor ring; Step 4: Keep the tower crane steadily lifting and holding the unloading platform still. For each front U-shaped anchor ring on the (N + 1)th floor and the (N + 2)th floor, respectively sleeve a shield-shaped steel plate, an I-beam, a rectangular steel plate and a steel gasket and tighten the double nuts to complete the installation of the conversion supports for the upper pulling points of the two inclined stay steel wires on the (N + 1)th floor and the two on the (N + 2)th floor. Tie the upper ends of the working steel wires of the far-side inclined stay on both sides of the platform to the orifice plates of the two conversion supports on the (N + 2)th floor. The outer wire must be tightened upwards to make the outer end of the platform 20 mm to 30 mm higher than the inner end to ensure that the outer wire is truly stressed. Then, tie the near-side inclined stay safety steel wires on both sides of the platform to the orifice plates of the two conversion supports on the (N + 1)th floor and tension and fix them firmly. Once the outer wire on the (N + 2)th floor breaks and fails, the inner wire on the (N + 1)th floor can independently bear the role of stabilizing the platform under tension; Step 5: Only after the two inclined stay steel wires on both sides of the unloading platform are in place and pulled to be stressed can the lifting ropes of the tower crane be withdrawn; Step 6: After fully covering the gap between the innermost I-beam secondary beam of the unloading platform and the outer edge of the building structure with walkway boards, completing the surrounding safety nets and protective railings, organize the acceptance and commissioning of the steel cantilever unloading platform on the Nth floor.

8. The overhanging discharging platform device based on the stay cable upper pulling point conversion support according to claim 1, characterized in that: The process of transferring the steel cantilever unloading platform on the Nth floor to the (N + 1)th floor for continued turnover use is as follows: Step 1: First, clean up the piled loads, sundries inside the steel cantilever unloading platform on the Nth floor and remove the walkway boards of the platform. Then, after the tower crane hook hooks the lifting steel wire rope of the platform, lift the weight of the unloading platform and successively remove the upper connection buckles of the two inclined stay steel wires on both sides of the unloading platform, the double nuts, steel pressing plates and steel gaskets of the front U-shaped anchor ring and the end U-shaped anchor ring of the main cantilever beam of the platform; Step 2: Remove the two conversion supports installed on the front U-shaped anchor ring on the (N + 1)th floor and install the two conversion supports on the front U-shaped anchor ring on the (N + 3)th floor; Step 3: The tower crane hook hooks the lifting steel wire rope of the platform. After reaching near the external scaffold on the floor of the (N + 1)th floor, temporarily remove the safety net of the external scaffold near the platform to be installed; Step 4: The tower crane continues to cooperate to guide the main I-beam of the cantilevered platform to pass through the external scaffold towards the structural floor slab on the (N + 1)th floor, insert it into and seat it inside the front U-shaped anchor ring and the inner side of the end U-shaped anchor ring on the (N + 1)th floor. Adjust the safety clearance between the unloading platform and the outer vertical pole of the external scaffold. Successively sleeve steel pressing plates and steel gaskets on the top of the main I-beam of the cantilevered platform within the positions of the front U-shaped anchor ring and the end U-shaped anchor ring and tighten the double nuts. Wedge the inner side of the U-shaped anchor ring firmly with wooden wedges to firmly press the main I-beam of the cantilevered platform inside the U-shaped anchor ring; Step 5: Keep the tower crane steadily hoisting the unloading platform without moving. Tie the upper ends of the far-side inclined pulling working steel wires (i.e., the outer wires) on both sides of the platform to the steel plate holes of the two conversion supports on the (N + 3)-th floor. The outer wires must be tightened upward so that the outer end of the platform is 20 to 30 mm higher than the inner end to ensure that the outer wires are truly stressed. Then, tie the near-side inclined pulling safety steel wires (i.e., the inner wires) on both sides of the platform to the steel plate holes of the two conversion supports on the (N + 2)-th floor and tension and stabilize them; Step 6: Only after the two inclined pulling steel wires on both sides of the unloading platform are in place and pulled to be stressed can the hoisting ropes of the tower crane be withdrawn; Step 7: After fully covering the gap between the innermost I-beam secondary beam of the unloading platform and the outer edge of the building structure with walkway boards, completing the surrounding safety nets and protective railings, organize the acceptance and commissioning of the steel structure cantilever unloading platform on the (N + 1)-th floor.

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