Three-row tie-type overhead scaffolding system for steel connecting corridors and its erection method

Abstract

This invention relates to the field of building construction, specifically a three-row tie-type elevated external scaffolding system for steel connecting corridors and its erection method. The steel connecting corridor is divided into tie-type and non-tie-type zones along its height. Tie-type frames and horizontal diagonal braces are installed in the tie-type zones to form a first stable unit where the external scaffolding on both sides supports each other. Outriggers are installed in the non-tie-type zones to form a second stable unit connecting the external scaffolding to the connecting corridor or structural slab. The two units jointly bear the load of the scaffolding, enabling elevated facade construction under conditions of large height differences, no ground contact, and irregular misalignment. A double-upper reinforcement zone is provided at the bottom, while a single upper is used at the top. All tie points are detachably connected to the connecting corridor structure using clamps or pre-embedded short steel pipes, requiring no welding. The system consists of a three-row upright scaffolding body, tie / outrigger components, and fasteners. It is easy to install and dismantle, and the structure remains undamaged after dismantling, meeting the requirements for reversible assembly and green construction. It is suitable for one-time, large-area steel connecting corridor facade decoration work.

Description

Technical Field

[0001] This invention relates to the field of external scaffolding technology in building construction, and particularly to the construction of the facade of a steel connecting corridor with a large elevation difference and no ground support conditions; specifically, it is a three-row tie-type overhead external scaffolding system for steel connecting corridors and its erection method. Background Technology

[0002] With the rapid development of large public buildings, commercial complexes, and high-rise buildings, steel structure corridors are widely used to connect different towers or podiums due to their advantages such as lightweight design, large span, and open space. However, steel corridors often have the following structural characteristics: The upper and lower facade projections do not coincide, exhibiting an irregular and misaligned shape; The height difference between the connecting corridor and the main building is large (the height difference of a single section is often >10 m), and there is no grounding at the bottom. The steel structure has diagonal braces and large spacing between the upper and lower chords, making it difficult to reliably connect them with traditional scaffolding wall ties. Extensive welding is prohibited on site to avoid damaging the main structure and fireproof coating.

[0003] Under the above conditions, conventional ground-supported scaffolding cannot be erected due to the lack of foundation support; suspended platform solutions cannot meet the requirements for simultaneous multi-point construction and safety due to issues such as misaligned projection, high wind speed, and interference from diagonal bracing; and ordinary cantilever scaffolding, lacking continuous wall ties, suffers from large lateral displacement and poor stability, making it difficult to bear decorative loads (≥2.5 kN / m) such as exterior painting, aluminum panel edging, and glass railing installation. 2 Existing technologies often use temporary steel platforms or locally welded steel plates for support, but these methods have drawbacks such as material waste, long installation periods, high risks of hot work at heights, and difficulties in dismantling.

[0004] Therefore, there is an urgent need for a new type of external scaffolding system and its erection method that does not require a foundation, can make full use of the steel corridor's own structure for reliable multi-point connection, and can meet the requirements of simultaneous operation on large elevation differences and irregular facades. Summary of the Invention

[0005] The present invention aims to provide a three-row anti-braced overhead scaffolding system for steel connecting corridors and its erection method, in order to solve the problems that traditional scaffolding or suspended scaffolding cannot safely bear decorative loads, have insufficient wall connection points, and have large lateral displacement of the scaffolding under conditions of large height difference, irregular misalignment, and no ground support, so as to realize one-time, large-area, safe and efficient operation of steel connecting corridor facade construction.

[0006] To achieve the above objectives, the present invention is implemented as follows: A method for erecting a three-row tie-type overhead scaffolding system for steel connecting corridors includes: The steel connecting corridor is divided along its height into at least one tension zone and at least one non-tension zone; In the tie zone, the first tie assembly is set up using the steel structure of the connecting corridor itself, so that the external scaffolding on both sides of the connecting corridor supports each other and forms the first stable unit; In the non-tie zone, a second tie assembly is set up using the steel structure of the connecting corridor itself or adjacent structural plates to form a second stable unit between the external scaffolding and the connecting corridor or structural plates. The first stabilizing unit and the second stabilizing unit jointly bear the load of the frame, enabling the construction of the elevated facade under conditions of large height difference and no grounding.

[0007] Furthermore, the first tie assembly includes a tie frame body and a horizontal diagonal brace, and the second tie assembly includes a throw brace.

[0008] Furthermore, the tie frame is a three-row upright frame, and the horizontal diagonal brace is arranged at an angle to the longitudinal direction of the connecting corridor.

[0009] Furthermore, the connection points between the first tie assembly and / or the second tie assembly and the connecting corridor are provided with clamps or pre-embedded short steel pipes.

[0010] Furthermore, the clamps tightly hold the upper and lower chords or diagonal web members of the connecting corridor, and the pre-embedded short steel pipes are pre-embedded in the connecting corridor structural slab and welded to the floor slab reinforcement.

[0011] Furthermore, the aforementioned method for erecting a three-row tie-type overhead scaffolding system for steel connecting corridors includes a pre-set double-upper reinforcement zone at the bottom, with single-upper poles used above the reinforcement zone height.

[0012] Furthermore, in the above-mentioned method for erecting a three-row anti-tie type overhead scaffolding system for steel connecting corridors, a first stabilizing unit is set at a predetermined distance along the longitudinal direction of the connecting corridor in the anti-tie zone; and a second stabilizing unit is set at a predetermined number of spans along the longitudinal direction of the connecting corridor in the non-anti-tie zone.

[0013] This invention also proposes a three-row tie-type overhead scaffolding system for steel connecting corridors, characterized in that it includes: The scaffold body has three rows of uprights. The bottom of the scaffold body is provided with a double upright reinforcement zone, and the height above the reinforcement zone is changed to a single upright.

[0014] The first tie assembly, located in the tie zone, is used to support the external scaffolding on both sides of the connecting corridor to form the first stable unit; The second tie assembly, located in the non-tie zone, is used to connect the external scaffolding to the connecting corridor or adjacent structural slab to form a second stabilizing unit. Both the first and second tie components are connected to the scaffold body and the connecting corridor via detachable fasteners; the detachable fasteners are couplers, and the scaffold body is a steel pipe coupler system.

[0015] The first tie assembly includes a tie frame and a horizontal diagonal brace, and the second tie assembly includes a throw brace.

[0016] Furthermore, the first tie assembly and / or the second tie assembly are provided with clamps or pre-embedded short steel pipes between themselves and the connecting corridor; the clamps tightly hold the upper and lower chords or diagonal web members of the connecting corridor, and the pre-embedded short steel pipes are pre-embedded in the connecting corridor structural slab and welded to the floor slab reinforcement.

[0017] The three-row anti-bracing overhead scaffolding system and its erection method shown in this invention have the following advantages and features: 1. By arranging dual-stability units in the "pull-up zone + non-pull-up zone", this invention enables continuous erection of external scaffolding under conditions of large elevation differences, no grounding, and irregular misalignment. It solves the defects of traditional scaffolding or suspended scaffolding that cannot be equipped with wall ties and have insufficient lateral stiffness, thus meeting the requirements for one-time operation of the facade.

[0018] 2. Both the first tie assembly (tie frame body + horizontal diagonal brace) and the second tie assembly (outrigger) are purely mechanically connected, which can eliminate the need for welding operations, avoid fire risks, protect the original fireproof coating of the steel corridor, and meet on-site fire management requirements.

[0019] 3. The combination of clamps and pre-embedded short steel pipes directly utilizes the steel corridor's own structure as the stress point, which can reduce the span of a single section of the overhead frame, eliminate the need for an additional steel platform, save materials, and facilitate installation and dismantling.

[0020] 3. The bottom "double upright reinforcement zone" can ensure the basic stability and safety performance of special irregular scaffolding, while the upper part restores the single upright, taking into account economy.

[0021] 4. The system uses standard steel pipe fasteners throughout, and the connecting corridor structure remains undamaged after dismantling. It meets the requirements for reversible assembly and green construction, and is suitable for reuse scenarios similar to steel connecting corridors. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the working plan of a steel connecting corridor section in the embodiment, showing the layout range of the tension zone and the non-tension zone, as well as the longitudinal setting positions of the first and second stabilizing units.

[0023] Figure 2 for Figure 1 The elevation diagram shows the height range of the bottom double upright reinforcement area, the inter-layer arrangement of the embedded wall ties, and the overall elevation outline of the frame.

[0024] Figure 3 This is a cross-sectional schematic diagram of the non-pull-out section in the same embodiment, showing the relationship between the upper and lower fixing points of the outriggers, the pre-embedded short steel pipe wall ties, the working layer scaffold boards, the safety net, and the fire blanket.

[0025] Figure 4This is a cross-sectional schematic diagram of the middle section of the tie zone in the same embodiment, showing the three rows of tie frames, the angle of the horizontal diagonal braces, the tie method of the external scaffolding on both sides of the connecting corridor, and the arrangement of the figure-eight braces.

[0026] Figure 5 The following is a detailed drawing of the tie frame in the same embodiment, showing the longitudinal spacing, step distance, frame width, and connection details of the horizontal diagonal braces and inner and outer row nodes of the three rows of tie uprights. Detailed Implementation

[0027] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0028] Example: The area consists of three irregularly shaped, double-layered steel connecting corridors located between two towers. The upper and lower facade projections of each corridor are staggered by approximately 3.2 m. The bottom elevation of the corridor is +39.50 m, the top elevation is +47.20 m, and the clear height difference is 7.7 m. Welding is prohibited on site. The exterior facades must be painted, have aluminum panel edging, and have glass railings installed. The uniformly distributed construction load is taken as 2.5 kN / m. 2 The "Three-Row Tie-Type Overhead Scaffolding System for Steel Connecting Corridors and Its Erection Method" as described in this invention was used for the operation. The specific process is as follows: I. Materials and Main Parameters: Scaffolding steel pipes: φ48×3.0 mm, Q235; Fasteners: National standard right-angle, swivel, and butt fasteners; Clamp: Double semicircle φ160~φ219 mm, with matching M16 high-strength bolts; Pre-embedded short steel pipe: 350 mm in length, with a 100×100×10 mm steel plate as the base plate, and welded to the floor slab reinforcement on both sides for ≥50 mm. Scaffolding boards: 50 mm thick steel mesh; fire blanket: 1 m × 2 m fiberglass blanket.

[0029] II. Erection Steps: Step 1: Partition positioning; according to Figure 1 As shown, each connecting corridor is divided into a parallel zone (elevation difference > 10 m) and a non-parallel zone (elevation difference ≤ 10 m) along its height, and marked with colored stripes.

[0030] Step 2: Reinforce the bottom with double uprights; Starting from the 9th floor structural slab (+39.50 m), the uprights within the bottom 12 m are arranged in double rows with a longitudinal spacing of 800 mm, a transverse spacing of 200 mm / 1000 mm / 1000 mm, and a step distance of 1800 mm; above 12 m, they are replaced with single uprights to reduce the amount of steel pipe used.

[0031] Step 3: Pre-embed wall ties; Before the concrete is poured for the structural slab of each connecting corridor, short steel pipes are pre-embedded in accordance with the principle of "each floor and every two spans", with 150 mm exposed on the slab surface. φ12 anchor feet are welded around the perimeter and spot-welded to the slab reinforcement. After the curing period, the pipes are connected to the uprights through fasteners to form rigid tie points.

[0032] Step 4: Install steel pipe clamps; Double semi-circular clamps are installed at the upper and lower chords and diagonal web members of the connecting corridor, with 3 mm rubber pads inside and bolt torque of 40 N·m; φ48 short pipes are welded to the outside of the clamps as horizontal bar connection points to achieve lateral positioning of the frame and steel beams.

[0033] Step 5: First stabilizing unit in the pull region; according to Figure 4 , Figure 5 Between the two connecting corridors (span approximately 8 m), a three-row anti-bracing frame is erected: longitudinal spacing 1500 mm, step spacing 1800 mm, and frame width 2.5 m; two horizontal diagonal braces are installed within the corresponding step spacing, forming a 55° angle with the longitudinal direction of the connecting corridor, and each end of the member is locked with three swivel couplers to form a triangular stability zone.

[0034] Step 6: Second stable unit in the non-pull region; according to Figure 3 Double supports are installed every two spans: the upper support is located at the second and fourth steps of the frame, and the lower support is connected to the pre-embedded short steel pipe. The support angle is controlled at 50°. When the length of a single steel pipe is insufficient, butt couplers are used to extend it. The joints are staggered by more than 1m and three additional couplers are added. The middle of the outer row of supports is connected to the inner row of frames with short steel pipes to reduce the slenderness ratio.

[0035] Step 7: Surface layer and safety protection; Steel mesh sheets are laid every three steps on the working level, with 180 mm kickboards on the outside and safety netting hung on them; the welding working level is fully covered with fireproof blankets to prevent sparks from falling. Continuous scissor bracing on the exterior facade of the scaffold is installed as it is erected, with an angle of 45° to 60° to the ground.

[0036] III. System Composition: After completing the above steps, the following is formed: Figure 1 , Figure 2 The system shown: Three-row upright scaffold body; First tie-in component: three rows of tie-down frame + horizontal diagonal brace; Second tie-in component: Thruster; Connecting components: clamps, embedded short steel pipes, fasteners; All components are detachable and connected in the reverse order of assembly. The structural surface is free of weld marks and additional openings, meeting the requirements for green construction and reuse.

[0037] V. Demolition and Relocation After construction is completed, the components are unloaded layer by layer according to the principle of "last-installed, first-removed". Hoops, pre-embedded short steel pipes, steel pipes and fasteners are recycled in categories and, after inspection, are directly used in the next connecting corridor section, achieving zero waste of materials.

[0038] VI. Conclusion: The following results were achieved for this project after adopting the scaffolding system and its construction method as shown in this invention: 1. Lateral stiffness After adopting the "tie-stayed frame + figure-eight bracing" and "double outriggers in non-tie-stayed zones", the on-site application rate was 2.5 kN / m. 2 Load test: The horizontal displacement at mid-span of the tension zone was 28 mm, which is less than the 55 mm displacement of the cantilever section under the same conditions, proving that segmented tensioning can significantly reduce lateral displacement.

[0039] 2. Node reliability The feasibility of using pre-embedded short steel pipes welded to floor slab reinforcement and steel pipe clamps to hold diagonal web members was verified through "welding pre-embedded short steel pipes to floor slab reinforcement" and "using steel pipe clamps to hold diagonal web members". Three sets of pull-out tests were conducted on the pre-embedded joints, with an ultimate load of 28 kN. The failure mode was steel bar yielding, and no concrete splitting occurred, meeting the "no damage to the main structure" objective. The clamp joints were loaded to 1.25 times the design load, with stress <215 MPa, maintaining elasticity, thus verifying the feasibility of using clamps as rigid tension points.

[0040] 3. Fire protection During the operation, a fireproof blanket was added to the welding work layer. Simulating slag falling for 10 minutes, the temperature rise on the blanket back was less than 50°C, and the underlying coating remained intact, meeting the on-site fire safety acceptance requirements.

[0041] 4. Materials and Construction Period Compared to the "traditional steel platform" solution, the steel consumption for a single connecting corridor was reduced from 52 tons to 37 tons, saving approximately 28%, consistent with the description of "reducing the span of the elevated structure and eliminating the need for a steel platform." Six scaffolders completed the main structure erection in five days, two days ahead of the suspended platform relocation solution, achieving the goal of "one-time large-scale operation."

[0042] 5. Dismantling and reuse The clamp contact surface only leaves indentations, and the paint film has no cracks; after the embedded base plate is removed, the dent is less than 0.3 mm, and it can be directly repaired with paint and reused, meeting the requirements for reversible assembly.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for erecting a three-row, tie-type, overhead scaffolding system for steel connecting corridors, characterized in that, include: The steel connecting corridor is divided along its height into at least one tension zone and at least one non-tension zone; In the tie zone, the first tie assembly is set up using the steel structure of the connecting corridor itself, so that the external scaffolding on both sides of the connecting corridor supports each other and forms the first stable unit; In the non-tie zone, a second tie assembly is set up using the steel structure of the connecting corridor itself or adjacent structural plates to form a second stable unit between the external scaffolding and the connecting corridor or structural plates. The first stabilizing unit and the second stabilizing unit jointly bear the load of the frame, enabling the construction of the elevated facade under conditions of large height difference and no grounding.

2. The method for erecting a three-row tie-type overhead scaffolding system for steel connecting corridors according to claim 1, characterized in that, The first tie assembly includes a tie frame and a horizontal diagonal brace, and the second tie assembly includes a thrust brace.

3. The method for erecting a three-row tie-type overhead scaffolding system for steel connecting corridors according to claim 2, characterized in that, The tie frame consists of three rows of uprights, and the horizontal diagonal braces are arranged at an angle to the longitudinal direction of the connecting corridor.

4. The method for erecting a three-row tie-type overhead scaffolding system for steel connecting corridors according to any one of claims 1 to 3, characterized in that, The connection points between the first tie assembly and / or the second tie assembly and the connecting corridor are equipped with clamps or pre-embedded short steel pipes.

5. The method for erecting a three-row tie-type overhead scaffolding system for steel connecting corridors according to claim 4, characterized in that, The clamps hold the upper and lower chords or diagonal braces of the connecting corridor tightly, and the pre-embedded short steel pipes are pre-embedded in the structural slab of the connecting corridor and welded to the floor slab reinforcement.

6. The method for erecting a three-row tie-type overhead scaffolding system for steel connecting corridors according to any one of claims 1 to 5, characterized in that, The bottom is pre-set with a double-pole reinforcement zone, and above the height of the reinforcement zone, it is replaced with a single pole.

7. The method for erecting a three-row tie-type overhead scaffolding system for steel connecting corridors according to any one of claims 1 to 6, characterized in that, In the longitudinal direction of the connecting corridor, a first stabilizing unit is set at predetermined intervals in the tensioned area; in the longitudinal direction of the connecting corridor, a second stabilizing unit is set at predetermined spans in the non-tensioned area.

8. A three-row tie-type overhead scaffolding system for steel connecting corridors, characterized in that, include: The scaffold body has three rows of uprights. The bottom of the scaffold body is provided with a double upright reinforcement zone, and the height above the reinforcement zone is changed to a single upright.

9. The first tie assembly, located in the tie zone, is used to support the external scaffolding on both sides of the connecting corridor to form the first stable unit; The second tie assembly, located in the non-tie zone, is used to connect the external scaffolding to the connecting corridor or adjacent structural slab to form a second stabilizing unit. Both the first and second tie components are connected to the scaffold body and the connecting corridor via detachable fasteners; the detachable fasteners are couplers, and the scaffold body is a steel pipe coupler system.

10. The three-row tie-type overhead scaffolding system for steel connecting corridors according to claim 8, characterized in that, The first tie assembly includes a tie frame and a horizontal diagonal brace, and the second tie assembly includes a thrust brace.

11. The three-row tie-type overhead scaffolding system for steel connecting corridors according to claim 8 or 9, characterized in that, The first tie assembly and / or the second tie assembly are provided with clamps or pre-embedded short steel pipes between themselves and the connecting corridor; the clamps hold the upper and lower chords or diagonal web members of the connecting corridor tightly, and the pre-embedded short steel pipes are pre-embedded in the connecting corridor structural slab and welded to the floor slab reinforcement.

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