Fabricated flower basket overhanging type steel supporting beam external scaffold structure and construction method

Abstract

The invention belongs to the technical field of constructional engineering, and particularly relates to a fabricated flower basket overhanging type steel supporting beam external scaffold structure and a construction method. The fabricated flower basket overhanging type steel supporting beam external scaffold structure comprises an overhanging type steel supporting beam, a lower pre-embedded sleeve and an upper pre-embedded sleeve; the anchoring steel plate is fixedly connected to the inner end of the cantilever type steel supporting beam; the lower fastener penetrates through the hole of the anchoring steel plate and the lower pre-embedded sleeve to anchor the inner end of the cantilever type steel supporting beam to the lower structure of the building structure body; the at least one lug plate is fixedly connected to the overhanging profile steel supporting beam and located at a preset position between the inner end and the outer end of the overhanging profile steel supporting beam; the closed flower basket pull rod is provided with a length-adjustable mechanism; the upper connecting piece is used for connecting the upper end of the flower basket pull rod to the upper pre-embedded sleeve through a fastener; the lower connecting piece is used for connecting the lower end of the flower basket pull rod to the lug plate; and the closed flower basket pull rod is configured to provide upward tension support for the overhanging type steel supporting beam. The method is safe, convenient, fast, efficient and capable of achieving turnover construction.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering, and particularly relates to a prefabricated flower basket cantilever steel support beam external scaffolding structure and a construction method thereof. Background Art

[0002] In recent years, civil engineering construction has entered a stage of rapid development, and high-rise and super high-rise buildings have increasingly become one of the main building forms of modern civil engineering. Based on the needs of high-rise and super high-rise building construction and safety protection, external cantilever scaffolding is usually erected. The traditional method of erecting external cantilever scaffolding by embedding U-shaped bolts will cause a certain degree of damage to the exterior wall and floor slab of the main structure, occupy a large amount of indoor space, and consume a large amount of cantilever I-shaped steel; while the previous traditional construction method of inserting steel pipes into holes drilled in the building body as the external scaffolding cantilever structure will damage the overall strength of the structure and there is a risk of leakage after the holes are filled, and this construction method has certain safety risks. Therefore, it is particularly important to find a safe, convenient, fast, efficient and reusable external scaffolding construction method.

[0003] With the development of modern civil engineering, high-rise and super high-rise buildings are increasing day by day. During the construction of these buildings, external scaffolding is an essential temporary facility for construction operations, safety protection, etc. The traditional methods for erecting cantilever external scaffolding mainly include embedding U-shaped bolts to cantilever I-shaped steel and drilling holes in the building structure body and inserting steel pipes, etc.

[0004] However, the method of embedding U-shaped bolts to cantilever I-shaped steel usually requires a long I-shaped steel section to extend into the floor for counterweight or anchorage, which not only occupies valuable indoor construction space and may affect the floor slab structure, but also consumes a large amount of steel materials. And the method of directly drilling holes in the building structure body and inserting steel pipes as the cantilever support will damage the integrity and strength of the structural concrete. If the later sealing is not properly handled, there is a high risk of external wall leakage, affecting the building quality and durability, and at the same time this method also has certain construction safety hazards.

[0005] Therefore, the existing technology has deficiencies in aspects such as structural protection, space utilization, material consumption, construction efficiency, safety reliability, and component turnover utilization. In the construction of high-rise and super high-rise buildings, there is an urgent need for a more optimized external scaffolding cantilever support scheme and a safe, convenient, fast, efficient and reusable external scaffolding construction method. Summary of the Invention

[0006] Object of the Invention: The object of the present invention is to provide a prefabricated flower basket cantilever steel support beam external scaffolding structure and a construction method thereof in view of the deficiencies of the existing technology, which has a safe and reliable structure, does not damage the main structure, does not occupy indoor space, has a high material turnover rate, and is convenient and efficient in construction.

[0007] Technical solution: The prefabricated flower basket cantilever steel support beam external scaffolding structure provided by the present invention includes: A cantilever steel support beam for cantilever extending from a building structure; At least one lower embedded casing, which is pre-set in the lower structure of the building structure; An anchor plate, fixedly connected to the inner end of the cantilever steel support beam, and holes for passing fasteners are provided on the anchor plate; Lower fasteners, passing through the holes of the anchor plate and the lower embedded casing, and anchoring the inner end of the cantilever steel support beam to the lower structure of the building structure; At least one upper embedded casing, which is pre-set in the upper structure of the building structure and is located above the lower embedded casing; At least one ear plate, fixedly connected to the cantilever steel support beam at a predetermined position between its inner end and outer end; At least one closed flower basket tie rod, having a mechanism for adjusting the length; Upper connectors, used to connect the upper end of the flower basket tie rod to the upper embedded casing through fasteners; Lower connectors, used to connect the lower end of the flower basket tie rod to the ear plate; The closed flower basket tie rod is configured to provide an upward tensile support for the cantilever steel support beam.

[0008] To further improve the above technical solution, the cantilever steel support beam includes but is not limited to a 16# I-beam. When the cantilever steel support beam is in use, one end (inner end) of it is fixed to the building structure, and the other end (outer end) cantilever extends outside the building structure, and is used to bear the load of the external scaffolding erected above. Its cantilever length is determined according to the specific building structure form and the requirements for scaffolding erection.

[0009] Further, the lower fasteners adopt M20 high-strength bolts, and are used in cooperation with corresponding gaskets (such as 2 pieces of 5 cm × 5 cm perforated steel sheets) and nuts. The lower fasteners pass through the holes of the anchor plate and the lower embedded casing, and tightly anchor the cantilever steel support beam to the lower structure of the building structure through the anchor plate. Among them, the two perforated steel sheets can be respectively placed on both sides of the structure body, one close to the structure body and the other close to the anchor plate, so as to disperse stress and ensure firm connection.

[0010] Furthermore, the lower embedded casing uses a plastic casing with a diameter of Φ25 and a length of 300 mm. The plastic casing is pre-embedded at a designated position before the pouring of the lower structure (such as a concrete beam or slab) of the building structure, forming a through-hole in the building structure. The upper embedded casing is similar to the lower embedded casing, using a plastic casing with a diameter of Φ25 and a length of 300 mm. The upper embedded casing is pre-embedded in the upper structure (such as the corresponding beam or slab of the upper floor) of the building structure, and its position is usually directly above the lower embedded casing or at a corresponding position determined according to the stress requirements.

[0011] Furthermore, the anchoring steel plate uses a steel plate with a specification of 200×180×12 mm. The anchoring steel plate is firmly fixed and connected to the inner end of the cantilever steel supporting beam by welding (such as full welding). At least one hole for passing through fasteners is provided on the anchoring steel plate. This hole is preferably an arc-shaped rectangular hole (such as a height of 22 mm and a length of 30 mm), which is convenient for adjustment and insertion of fasteners during installation.

[0012] Furthermore, the ear plate uses a perforated ear plate with a specification of 100×80×12 mm. The ear plate is fixedly connected to the upper flange or web of the cantilever steel supporting beam by welding (such as full welding along the edge). Its position is set at a predetermined distance between the inner end and the outer end of the supporting beam. According to the different lengths of the cantilever I-beam, the number and setting positions of the ear plates are also different. For example, when the cantilever length is less than 1.8 m, it can be welded 300 mm away from the outer end of the I-beam; when the cantilever length is greater than or equal to 1.8 m, ear plates can be welded at 200 mm and 800 mm away from the outer end of the I-beam respectively (corresponding to the case of double tie rods). The holes on the ear plate are used to connect the lower tie rod of the closed-type flower basket.

[0013] Furthermore, the closed-type flower basket tie rod uses a Φ20 finished closed-type flower basket tie rod, including a closed-type flower basket body. Both ends of the closed-type flower basket body are respectively provided with positive-thread and reverse-thread screw sections. The upper tie rod is connected to the positive-thread section, and the lower tie rod is connected to the reverse-thread section. The upper tie rod and the lower tie rod are respectively connected to the upper and lower connectors. By rotating the flower basket body, the total length of the tie rod can be conveniently adjusted and a pre-tightening force can be applied.

[0014] Furthermore, the upper connector uses a double-ear bolt pull ring for connecting the upper tie rod of the closed-type flower basket to the upper embedded casing. A wall-piercing bolt passes through the upper embedded casing, and the double-ear bolt pull ring is sleeved on the wall-piercing bolt and fixed. Then, the upper tie rod of the closed-type flower basket tie rod is connected to the double-ear bolt pull ring through a pin shaft. When it is necessary to set two flower basket tie rods (such as when the cantilever width is large or the load is high) to enhance stability, two upper embedded casings can be symmetrically arranged in the upper structure, with a horizontal spacing of 300 mm for example, and two upper connectors and two closed-type flower basket tie rods are correspondingly set, and they are symmetrically arranged on both sides of the cantilever steel supporting beam.

[0015] Furthermore, the lower connecting piece adopts an M20 pin shaft, and the lower connecting piece is used to rotatably connect the lower pull rod of the flower basket pull rod to the ear plate fixed on the cantilever steel support beam.

[0016] The cantilever steel support beam is anchored in the lower structure through the lower embedded sleeve and the lower fasteners, and is pulled upward to the upper structure through the basket tie rod, ear plate, upper connector and upper embedded sleeve. The upward pulling force provided by the basket tie rod balances the bending moment generated by the cantilever steel support beam under the scaffolding load, forming a stable "upper pull and lower anchor" cantilever support system.

[0017] The cantilever steel support beam described in the present invention is particularly suitable for supporting a disc-type scaffolding, and its vertical poles (such as Φ48×3.0) can be directly placed on the cantilever steel support beam and limited by positioning steel bars, and the cross bars (such as Φ48×2.5) are connected to the vertical poles in a conventional manner to form a scaffolding system for the main structure construction operation platform and facade protection.

[0018] In order to accurately locate and prevent the vertical poles of the scaffolding (especially the disc-type scaffolding) erected on the cantilever steel support beam from slipping, the present invention also preferably includes at least one positioning member, such as a 95mm long Φ18 positioning steel bar. The positioning steel bar is fixed to the upper surface of the cantilever steel support beam by welding (such as full edge welding), and its position is determined according to the cantilever length, such as: when the cantilever length is less than 1.8m, it can be welded 100mm away from the outer end of the I-beam; when the cantilever length is greater than or equal to 1.8m, it can be welded 300mm away from the outer end of the I-beam. The positioning steel bar can clamp the bottom of the scaffolding vertical pole to play a limiting role.

[0019] The present invention also provides a construction method for realizing the above-mentioned assembled flower basket cantilever steel support beam external scaffolding, the method comprising the following steps: The lower embedded casing is embedded before the lower structure of the building structure is poured; After the concrete of the lower structure reaches the predetermined strength, the cantilever steel support beam with anchoring steel plates and ear plates is anchored to the lower structure through the lower fasteners; Set up temporary top supports under the cantilever steel support beams and erect scaffolding above the cantilever steel support beams; Pre-embed the upper pre-embedded sleeve before pouring the upper structure of the building structure; After the upper structure concrete reaches a predetermined strength, the upper connecting piece is installed to connect the upper end of the closed flower basket tie rod to the upper embedded sleeve, and at the same time, the lower end of the closed flower basket tie rod is connected to the ear plate through the lower connecting piece; Tension the closed flower basket tie rod to a predetermined tension, and after confirming that the cantilever steel support beam is stable, remove the temporary top support; When the construction of this area is completed and the scaffolding is no longer needed, all metal structural members shall be demolished and collected in accordance with the principle of "demolish the ones erected first and the ones erected later first", for subsequent turnover.

[0020] Among them, before pouring the lower structure (such as beams or slabs) of the building structure, according to the position of the cantilever support beam determined by the design drawings, accurately embed the lower embedded casing. It is necessary to tie the lower embedded casing firmly to the steel bars and clamp it tightly with the formwork to prevent displacement during concrete pouring and vibration. When the concrete strength of the lower structure reaches a certain requirement (such as 10 MPa), hoist the prefabricated (already welded with anchor plates, ear plates, and positioning steel bars) cantilever steel support beam in place, so that the anchor plate at its inner end fits the structure side. Use the lower fasteners to pass through the holes of the anchor plate and the pre-embedded lower embedded casing to firmly anchor the support beam to the lower structure.

[0021] Before the flower basket tie rod is installed and tightened under force, in order to ensure the stability and safety of the cantilever steel support beam during the subsequent scaffolding erection process, it is necessary to set up temporary props under its cantilever end. The form of placing 2 Φ48×2.7 steel pipes inside the U-shaped top support can be used for temporary vertical support.

[0022] Erect the external scaffolding frame body (such as a disc buckle scaffold) on the cantilever steel support beam according to the design requirements.

[0023] Before pouring the upper structure of the building structure (the floor corresponding to the upper part of the cantilever support beam), also embed the upper embedded casing according to the design position. When the concrete strength of the upper structure reaches the design requirements (such as the design strength or at least 15 MPa), install the upper connectors (such as double-ear bolt rings, fixed by wall-piercing bolts), and then connect one end of the flower basket tie rod to the ear plate of the cantilever steel support beam through the lower connector (such as a pin shaft), and the other end to the upper connector.

[0024] Rotate the flower basket body of the flower basket tie rod to adjust the length of the tie rod, so that it is tightened to the predetermined tensile value, causing the cantilever steel support beam to produce a certain upward arch or reach the horizontal stress state. After confirming that the flower basket tie rod has been tightened as required and is effectively stressed, the previously set temporary props can be removed.

[0025] After the use of this section of the scaffolding is completed, in accordance with the principle of "demolish the ones erected first and the ones erected later first", sequentially demolish the components such as the scaffolding frame body, flower basket tie rod, and cantilever steel support beam from top to bottom. All the disassembled components (cantilever steel support beam, flower basket tie rod, fasteners outside the casing, connectors, etc.) can be cleaned and turned over to the next construction section or project for use.

[0026] Advantages: Compared with the prior art, the present invention has the following advantages: By using pre-embedded sleeves instead of later drilling, the present invention completely avoids damaging the main structure (beams, slabs), ensuring the integrity and strength of the structure, and fundamentally eliminating the leakage risk caused by poor hole plugging; In the present invention, the anchoring and tying of the cantilever support beam are completed on the side of the structure, without occupying valuable indoor floor construction space. Adopting the force-bearing mode of "pulling from above and anchoring from below", the bending moment of the cantilever steel support beam is effectively reduced, greatly reducing the required section size and length of the steel (no long counterweight section), and significantly saving the steel consumption; The main components used in the present invention (such as steel support beams, flower basket tie rods, connectors, etc.) can be prefabricated, and the on-site work is mainly assembled installation. The process is clear and the operation is simple, which can greatly shorten the erection and demolition cycle of the scaffold and improve the construction efficiency; The force-bearing mode of the structure formed by the present invention is clear, and the connection nodes are clear and reliable. Using high-strength bolts for anchoring and flower basket tie rods with adjustable tension for tying ensures the bearing capacity and stability of the cantilever structure. Temporary top supports are set during the construction process to ensure the safety during the installation stage. Except for the pre-embedded sleeves, most components such as cantilever steel support beams, flower basket tie rods, fasteners, connectors, and disc buckle scaffolds can be completely demolished and reused repeatedly, which conforms to the concept of green construction and sustainable development in modern architecture; The structure and method provided by the present invention are particularly suitable for the external scaffold projects of high-rise and super high-rise buildings with high requirements for structure protection, space utilization, and construction efficiency. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of a pre-embedded plastic sleeve; Figure 2 It is a positioning schematic diagram of a cantilever steel support beam (I-beam) and an anchoring steel plate; Figure 3 It is a schematic diagram of M20 bolts and supporting connections; Figure 4 It is a detailed drawing of a cantilever steel support beam; Figure 5 It is a schematic diagram of a temporary top support for a cantilever steel support beam; Figure 6 It is a schematic structural diagram of a closed flower basket tie rod; Figure 7 It is a sectional view of a closed flower basket tie rod; Figure 8 It is a schematic structural diagram of a double-ear bolt pull ring, Figure 8 a is the front view, Figure 8 b is the side view; Figure 9 It is a fixed node diagram at the upper end of a double-ear bolt pull ring; Figure 10 It is an elevation view of the external scaffold structure of a flower basket cantilever steel support beam.

[0028] The reference numerals in the figure are as follows: 1. Cantilever steel support beam; 2. Anchor plate; 3. Bolt; 4. Perforated steel sheet; 5. Matching nut; 6. Perforated ear plate; 7. Positioning steel bar; 8. Lower pull rod; 9. Pin shaft; 10. U-shaped top support; 11. Support steel pipe; 12. Double-ear bolt pull ring; 13. Closed flower basket; 14. Upper pull rod; 15. Upper structure; 16. Lower structure; 17. Screw disk formwork support system. Specific embodiments

[0029] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the described embodiments.

[0030] Embodiment 1: The assembled flower basket cantilever steel support beam external scaffolding structure provided in this embodiment includes: a cantilever steel support beam for cantilever extending from a building structure; at least one lower embedded sleeve pre-set in the lower structure of the building structure; an anchor plate fixedly connected to the inner end of the cantilever steel support beam, and the anchor plate is provided with holes for passing fasteners; a lower fastener passing through the holes of the anchor plate and the lower embedded sleeve to anchor the inner end of the cantilever steel support beam to the lower structure of the building structure; at least one upper embedded sleeve pre-set in the upper structure of the building structure and located above the lower embedded sleeve; at least one ear plate fixedly connected to the cantilever steel support beam at a predetermined position between its inner end and outer end; at least one closed flower basket having an adjustable length mechanism; an upper connecting member for connecting the upper end of the flower basket pull rod to the upper embedded sleeve through a fastener; a lower connecting member for connecting the lower end of the flower basket pull rod to the ear plate; the closed flower basket is configured to provide an upward tensile support for the cantilever steel support beam.

[0031] Among them, the cantilever steel support beam is made of 16# I-beam, the anchor plate has a specification of 200×180×12, the lower embedded sleeve and the upper embedded sleeve have a specification of Φ25 plastic sleeve with a length of 300mm, the closed flower basket pull rod is made of Φ20 finished closed flower basket pull rod, and materials such as Φ48×2.5 disc buckle cross bars with lengths of 1.5m and 0.9m, Φ48×3.0 disc buckle vertical poles with lengths of 2m and 3m, Q355B adjustable top supports, Φ48×2.7 steel pipes with a length of 3m, M20 bolts and 100×80×12 perforated ear plates are used. The cantilever length of the 16# I-beam is determined according to the specific structural form, and the consumption of other materials is determined according to the floor height and structural perimeter.

[0032] As Figure 1 shown, the Φ25 plastic sleeve with a length of 300mm is embedded during the binding of the reinforcement bars of the structural hanging beam or hanging plate, and is used for passing bolts subsequently to avoid damaging the structure by drilling holes later.

[0033] As Figure 2As shown in the figure, the 200×180×12 anchor plate is fully welded along the edge with the 16# I-beam. The M20 bolt passes through the arc-shaped rectangular hole on the anchor plate to fix the 16# cantilever I-beam support beam.

[0034] As Figure 3 shown, the M20 bolt is used together with 2 5cm×5cm perforated steel plates and 2 matching nuts. Among them, the two perforated steel plates are respectively located on both sides of the structural hanging beam or slab. One is in close contact with the structural hanging beam or slab, and the other is in close contact with the anchor plate.

[0035] As Figure 4 shown, at the connection A between the 16# I-beam and the anchor plate, full welding along the edge and groove welding are adopted. For the connection pools B and D between the two 100×80×12 perforated ear plates and the 16# I-beam, full welding along the edge and groove welding are also adopted. The lower pull rod 8 of the flower basket tie rod is tied with the perforated ear plate through the M20 pin shaft. At the connection C between the positioning steel bar 7 and the I-beam, full welding along the edge and groove welding are also adopted.

[0036] As Figure 5 shown, the 18 positioning steel bars with a length of 95mm are fully welded along the edge with the 16# I-beam as the positioning steel bars of the disc buckle formwork support system, and at the same time prevent the disc buckle formwork support system from slipping.

[0037] As Figure 6 、 Figure 7 shown, the closed flower basket tie rod is composed of a closed flower basket, a positive thread surface, and a reverse thread surface. Among them, a Φ20 pull rod (with a positive thread surface and a reverse thread surface) is inserted into the Φ32 closed flower basket, and the upper pull rod and the lower pull rod are respectively screwed and connected with the positive thread surface and the reverse thread surface.

[0038] As Figure 8 shown, the double-ear bolt pull ring is connected with the upper pull rod through the M20 pin shaft. When setting double pull rods, the double-ear bolt pull rings are 300mm apart and are symmetrically arranged on the left and right sides of the 16# cantilever I-beam.

[0039] As Figure 9 shown, for the vertical and horizontal bars of the disc buckle formwork support system: the external scaffolding is erected on the cantilever I-beam support beam according to the design parameters, which serves as the construction operation platform for the main structure and the external facade protection.

[0040] The specific technical implementation plan is as follows: First, following the progress of the steel bar binding of the structural hanging beam or slab of the main structure, pre-embed a Φ25 plastic sleeve with a length of 300mm at the lower structure where the cantilever I-beam is to be installed. The plastic sleeve is clamped tightly with the closed formwork to ensure that it does not shift due to concrete pouring and vibration.

[0041] Secondly, when the concrete strength of the hanging beam or slab reaches 10 MPa, install the 16# I-beam support beam as follows: (1) The end of the 16# I-beam is fully welded to the 200×180×12 anchor plate. The anchor plate is pre-opened with an arc-shaped rectangle with a height of 22 mm and a length of 30 mm for passing bolts; (2) The 16# I-beam is connected to the lower structure through M20 bolts via pre-buried plastic sleeves. The M20 bolts are used together with 2 5 cm×5 cm perforated steel sheets and 2 matching nuts; (3) According to the length of the cantilever I-beam, weld a 100×80×12 perforated ear plate and a 95 mm long 18 positioning steel bar at a certain distance from the end of the 16# I-beam: When the length of the cantilever I-beam is less than 1.8 m, weld the positioning steel bar 100 mm from the end of the 16# I-beam and weld the perforated ear plate 300 mm from the end of the 16# I-beam; When the length of the cantilever I-beam is greater than or equal to 1.8 m, weld the positioning steel bar 300 mm from the end of the 16# I-beam and weld the perforated ear plates 200 mm and 800 mm from the end of the 16# I-beam respectively. Among them: The positioning steel bar is used to fix and position the disc buckle vertical pole to prevent the disc buckle vertical pole from deviating and slipping; The perforated ear plate is connected to the Φ20 finished closed type flower basket pull-down rod through an M20 pin shaft.

[0042] After that, when the concrete strength of the hanging beam or slab reaches 15 MPa, set up a disc buckle scaffold on the cantilever I-beam support beam. Before pulling the closed type flower basket tie rod, it is necessary to temporarily support the cantilever I-beam support beam at the lower part. The support is in the form of placing 2 Φ48×2.7 steel pipes inside a U-shaped top support.

[0043] Then, when binding the steel bars of the hanging beam or slab of the upper structure, also pre-bury Φ25 plastic sleeves with a length of 300 mm. When the concrete strength of the hanging beam or slab of the upper structure reaches the design strength, connect the double-ear bolt pull ring passing through the wall to the upper pull rod of the flower basket bolt through the pre-buried plastic sleeve. The horizontal distance between the two double-ear bolt pull rings is 300 mm.

[0044] Finally, after the pulling of the flower basket tie rod of the cantilever I-beam support beam is completed, the lower temporary support structure can be removed. After use, the steel cantilever I-beam support beam structure is demolished from top to bottom in accordance with the principle of "first built, last demolished; last built, first demolished". The demolished materials and fittings can be transferred to the next project for use.

[0045] Example 2: Adopt the construction method of the assembled flower basket cantilever steel support beam external scaffold provided in Example 1, specifically as follows: Preparation: According to the detailed design of the construction drawings, it is determined that the cantilever steel support beam adopts a 16# I-beam with a length of 1.5 m (1.2 m cantilever and 0.3 m anchorage section). Prepare plastic sleeves with a diameter of Φ25 and a length of 300 mm, Q355B anchorage steel plates with dimensions of 200×180×12 mm (with 22×30 mm arc-shaped rectangular holes), M20 high-strength bolts and matching washers and nuts, Q355B perforated ear plates with dimensions of 100×80×12 mm, Φ18 steel bars with a length of 95 mm as positioning bars, Φ20 finished closed flower basket tie rods (the length needs to be calculated and determined according to the floor height and the position of the connection points), M20 pins, double-ear bolt pull rings, and formwork support members such as Φ48×3.0 vertical poles and Φ48×2.5 horizontal poles required for scaffolding erection. Weld the anchorage steel plate to one end of the 1.5 m long I-beam full-welded in advance; since the cantilever length of 1.5 m < 1.8 m, weld the positioning steel bars on the upper surface 100 mm away from the outer end of the I-beam, and weld the perforated ear plates on the upper part 300 mm away from the outer end of the I-beam.

[0046] Lower part embedding and installation: When tying the steel bars of the hanging beam on this floor, embed Φ25 plastic sleeves at the corresponding positions on the side of the beam according to the spacing requirements of the cantilever I-beams. After the beam concrete is poured and the strength reaches 10 MPa, hoist the processed 16# I-beam cantilever beam into place, and pass the M20 high-strength bolts through the holes of the anchorage steel plate and the embedded sleeves, and cooperate with the inner and outer steel washers and nuts to anchor the I-beam on the hanging beam.

[0047] Temporary support and scaffolding erection: Under the outer end of each cantilever I-beam, set up temporary top supports composed of U-shaped top supports and 2 Φ48×2.7 steel pipes. Then erect the vertical poles and horizontal bars of the formwork support on the cantilever I-beam steel beam. The bottom of the vertical pole is limited by the positioning steel bar.

[0048] Upper part embedding and tie rod installation: When tying the steel bars of the hanging beam corresponding to the upper floor, embed Φ25 plastic sleeves at the positions directly opposite to the ear plates of the cantilever beam below. After the concrete of the upper layer beam is poured and the strength reaches the design strength (or at least 15 MPa), install the wall-piercing bolts and double-ear bolt pull rings. Connect the lower end of the Φ20 flower basket tie rod to the ear plate of the I-beam with an M20 pin, and connect the upper end to the double-ear bolt pull ring.

[0049] Tightening and removing the temporary support: Rotate the flower basket of the flower basket tie rod to tighten the tie rod until the pre-tightening force required by the design is reached. After confirming that all tie rods are evenly stressed and the state of the cantilever beam is stable, remove the temporary top support below.

[0050] Subsequent Use and Demolition: The scaffolding is used according to normal procedures. When the construction in this area is completed and the scaffolding is no longer needed, following the principle of "first erected, last demolished; last erected, first demolished", first demolish the formwork and coupler scaffold, then loosen the hanging basket tie rods, and remove the tie rods, pin shafts, and upper connectors. Finally, remove the cantilever I-beams (loosen the lower fasteners). All the removed metal components are collected and sorted for subsequent reuse.

[0051] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as a limitation on the present invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims

1. An assembled flower basket cantilever steel support beam external scaffolding, characterized in that: include: Cantilever steel support beams are used to cantilever out from the building structure; At least one lower embedded sleeve, pre-arranged in the lower structure of the building structure; An anchoring steel plate, fixedly connected to the inner end of the cantilever steel support beam, the anchoring steel plate is provided with a hole for inserting a lower fastener; A lower fastener passes through the hole of the anchoring steel plate and the lower embedded sleeve to anchor the inner end of the cantilever steel support beam to the lower structure of the building structure; At least one upper embedded sleeve, pre-arranged in the upper structure of the building structure and located above the lower embedded sleeve; At least one ear plate fixedly connected to the cantilever steel support beam; At least one closed turnbuckle pull rod having a mechanism for adjusting the length; An upper connecting piece, used to connect the upper end of the closed flower basket pull rod to the upper embedded sleeve; a lower connecting member, used to connect the lower end of the closed flower basket pull rod to the ear plate; The closed basket tie rod is configured to provide upward tension support to the cantilever steel support beam.

2. The assembled flower basket cantilever steel support beam external scaffolding according to claim 1 is characterized by: The cantilever steel support beam adopts 16# I-steel. The inner end of the cantilever steel support beam is fixed to the building structure, and the outer end of the cantilever steel support beam is cantilevered out of the building structure. The cantilever length is determined according to the form of the building structure and the requirements for scaffolding erection.

3. The assembled flower basket cantilever steel support beam external scaffolding according to claim 1 is characterized in that: The plastic sleeves used for the lower pre-buried sleeves and the upper pre-buried sleeves are used to form a channel that penetrates the building structure.

4. The assembled flower basket cantilever steel support beam external scaffolding according to claim 1 is characterized in that: The hole on the anchoring steel plate for inserting the fastener is a rectangular hole with an arc shape.

5. The assembled flower basket cantilever steel support beam external scaffolding according to claim 1 is characterized in that: The closed flower basket pull rod comprises a closed flower basket body, and the two ends of the closed flower basket body are respectively provided with a positive thread surface and a negative thread surface, wherein the positive thread surface is connected with an upper pull rod, and the negative thread surface is connected with a lower pull rod, and the upper pull rod and the lower pull rod are respectively connected with the upper connecting member and the lower connecting member.

6. The assembled flower basket cantilever steel support beam external scaffolding according to claim 5 is characterized in that: The upper connecting member is a double-ear bolt pull ring, and the bolt section of the double-ear bolt pull ring is configured to be sleeved on the through-wall bolt of the upper embedded sleeve and fixed. The double-ear pull rod of the double-ear bolt pull ring is used to connect the upper pull rod of the closed flower basket pull rod; the lower connecting member adopts a pin shaft, which is used to rotatably connect the lower pull rod of the closed flower basket pull rod to the ear plate fixed on the cantilever steel support beam.

7. The assembled flower basket cantilever steel support beam external scaffolding according to claim 1 is characterized in that: When two flower basket pull rods are provided, two ear plates are provided on the cantilever steel support beam, and two upper embedded sleeves are provided in the upper structure of the building structure. The horizontal spacing between the two upper embedded sleeves is a predetermined value, and the two flower basket pull rods are symmetrically arranged on both sides of the cantilever steel support beam.

8. The assembled flower basket cantilever steel support beam external scaffolding according to claim 1 is characterized by: The cantilever steel support beam is configured to support the vertical poles and horizontal poles of the disc-type scaffolding.

9. The assembled flower basket cantilever steel support beam external scaffolding according to claim 8 is characterized in that: It also includes at least one positioning member, which is fixedly connected to the upper surface of the cantilever steel support beam and is used to position and limit the scaffolding uprights installed on the cantilever steel support beam.

10. A construction method for realizing the assembled flower basket cantilever steel support beam external scaffolding according to any one of claims 1 to 7, characterized in that: The following steps are involved: The lower embedded casing is embedded before the lower structure of the building structure is poured; After the concrete of the lower structure reaches the predetermined strength, the cantilever steel support beam with anchoring steel plates and ear plates is anchored to the lower structure through the lower fasteners; Set up temporary top supports under the cantilever steel support beams and erect scaffolding above the cantilever steel support beams; Pre-embed the upper pre-embedded sleeve before pouring the upper structure of the building structure; After the upper structure concrete reaches a predetermined strength, the upper connecting piece is installed to connect the upper end of the closed flower basket tie rod to the upper embedded sleeve, and at the same time, the lower end of the closed flower basket tie rod is connected to the ear plate through the lower connecting piece; Tension the closed flower basket tie rod to a predetermined tension, and after confirming that the cantilever steel support beam is stable, remove the temporary top support; When the construction in this area is completed and the scaffolding is no longer needed, all metal structural parts will be removed and collected and sorted according to the principle of "build first and dismantle later, build later and dismantle first" for subsequent turnover.

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