CN114412152A - Construction method for constructing I-steel scaffold by large-span overhanging structure of high-rise cluster project - Google Patents

Abstract

The invention discloses a construction method for constructing an I-steel scaffold by a large-span overhanging structure of a high-rise cluster project, which comprises the following steps: 1) arranging a plurality of horizontal cantilever beams; 2) arranging a plurality of groups of upright rod assemblies; 3) arranging a first cross bar and a second cross bar; 4) arranging a shear support assembly; 5) wall connecting construction; 6) unloading construction; 7) arranging a scaffold board and a foot baffle board; 8) arranging a protective guard; 9) and after the building construction is finished, dismantling the outer scaffold of the cantilever beam. The cantilever structure scaffold is adopted to replace a high-rise building to erect construction from the ground, and the defects that the full scaffold is high in material consumption, long in installation and disassembly time, long in time consumption, high in cost, difficult in installation and disassembly, high in danger, large in material investment and the like are overcome. Compared with the traditional inclined stay rope 'embedded ring' of the cantilever frame, the labor is saved, the inclined stay rope can be recycled for many times, the length of the pull rod can be adjusted at any time to ensure the stability of the frame body, and the I-shaped steel can be reused.

Description

Construction method of I-beam scaffolding for large-span cantilevered structures in high-rise cluster projects

technical field

The invention relates to the technical field of engineering construction, in particular to a construction method for constructing I-beam scaffolding with a large-span cantilever structure of a high-rise cluster project.

Background technique

External scaffolding is generally a scaffolding erected on the periphery of a building. During the construction process, the speed and quality of erecting the scaffolding are the key control points of building construction. The existing external scaffolding is not connected to the outer wall of the building, which results in unstable erection of the external scaffolding and difficulty in ensuring the quality. At the same time, the existing construction method for erecting the external scaffolding is relatively slow.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, for this reason, the present invention proposes a construction method for constructing I-beam scaffolding with a large-span cantilever structure of a high-rise cluster project, comprising the following steps:

1) Set up a plurality of horizontal cantilever beams, the horizontal cantilever beam is made of I-beam, the end of the horizontal cantilever beam far from the outer wall of the building is connected to the oblique hanging steel rope, and the other end of the oblique hanging steel rope is located above the horizontal cantilever beam and connected to the outer wall of the building;

2) Set up multiple sets of vertical pole components: the vertical pole components include external vertical poles and internal vertical poles arranged in parallel and at intervals, the internal vertical poles are arranged opposite to the outer wall of the building, and the external vertical poles and the internal vertical poles are connected by horizontal sweeping poles. The vertical pole components are connected by longitudinal sweeping poles, the vertical pole components are arranged on the horizontal cantilever beams, and the number of vertical pole components is the same as that of the horizontal cantilever beams and is arranged one-to-one;

3) Setting up the first crossbar and the second crossbar: a plurality of first crossbars and a plurality of second crossbars are arranged at intervals in the height direction of the vertical rod assembly, and the two ends of the first crossbar are The inner vertical bar is connected, the second horizontal bar is connected to the outer vertical bar, the end of the second horizontal bar is located at the junction of the first horizontal bar and the outer vertical bar, and the first horizontal bar is arranged above the second horizontal bar;

4) Set up shear brace components: shear brace components are connected to the outer elevation of the outer pole, and vertical shear brace components are continuously arranged along the full width and height of the outer elevation of the outer pole and from the bottom to the top;

5) Connecting wall construction: The vertical rod components are tied and fixedly connected with the connecting wall parts embedded in the outer wall of the building;

6) Unloading construction: After the strength of the connection between the inclined hanging steel rope and the outer wall of the building reaches 100% of the design strength, unload the inclined hanging steel rope;

7) Set up the scaffolding board and the toeboard: the inner pole is connected with a toeboard, the toeboard is located between the inner pole and the outer wall of the building, and a scaffolding board is laid between the inner pole and the outer pole, and the scaffolding board is set on the first floor. on a crossbar;

8) Set up guardrails: guardrails are fixed on the outer poles, and the outer facades of the outer poles are covered with dense mesh safety nets;

9) After the construction of the building is completed, remove the outer scaffolding of the cantilever beam: first remove the scaffolding board, toe board and shear brace components, and then remove the first cross bar, second cross bar and vertical bar components.

Beneficial effects: The use of cantilevered structure scaffolding replaces the construction of high-rise buildings from the ground, which solves the problem of large consumables for full-scale scaffolding, long installation and dismantling time, long time, high cost, difficult installation and dismantling, high risk, and large material investment, etc. defect. Compared with the "pre-embedded ring" of the cable-stayed rope of the traditional cantilever frame, it saves labor and can be used multiple times. The length of the tie rod can be adjusted at any time to ensure the stability of the frame body, and the I-beam can be reused.

In some embodiments of the present invention, in step 1), when the overhang length of the horizontal cantilever beam is 1300mm and the anchoring length is 2000mm, 20a I-beam is used.

In some embodiments of the present invention, in step 1), when the overhang length of the horizontal cantilever beam is 2000mm and the anchoring length is 3000mm, 25a I-beam is used.

In some embodiments of the present invention, in step 2), the vertical deviation of each inner pole and each outer pole is controlled to be ≤100 mm.

In some embodiments of the present invention, in step 3), the two ends of the first transverse rod are respectively away from the inner and outer vertical rods by an extension length of 150 mm.

In some embodiments of the present invention, in step 4), the angle at which the shear brace assembly is erected is 45°˜60°.

In some embodiments of the present invention, in step 4), after the shear bracing assembly is completed, transverse diagonal bracing is set at the openings at both ends of the outer scaffold of the cantilever beam, and the horizontal diagonal bracing is in the same section, from bottom to top Laid out continuously in a zigzag pattern.

In some embodiments of the present invention, in step 5), the tie point between the vertical rod assembly and the pre-embedded connecting wall member on the outer wall of the building is set within 300 mm of the junction of the first crossbar and the second crossbar.

In some embodiments of the present invention, in step 7), the foot guard is a stamped steel plate, and the height of the foot guard is 180 mm.

In some embodiments of the present invention, in step 2), a positioning steel bar with an outer diameter of 25 mm is welded on the horizontal cantilever beam, and the vertical rod assembly is seated outside the positioning steel bar.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, under the premise of no creative work, they can also follow these drawings. Figure to obtain additional drawings.

Fig. 1 is the construction plan schematic diagram of the embodiment of the present invention;

Fig. 2 is the schematic diagram that the embodiment of the present invention is provided with horizontal diagonal brace;

3 is a schematic structural diagram of an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a shear brace assembly according to an embodiment of the present invention.

Reference number:

10-Horizontal cantilever beam;

20- oblique hanging steel rope;

31-outer pole;

32 - inner pole;

33- Lateral sweeping rod;

34-Longitudinal sweeping rod;

35 - the first crossbar;

36 - second crossbar;

37 - Shear brace assembly;

41 - foot guard;

42 - Scaffolding board;

43 - safety net;

44- Lateral diagonal brace;

45-connecting wall parts;

46 - protective railing;

47 - Wood Fang;

50 - The angle at which the shear brace assembly is erected.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present invention. .

It is to be understood that, herein, the terms "upper", "lower", "left", "right", "front", "rear", "bottom", "top", "inner", "outer", etc. refer to The orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed in a specific orientation. and operation, and therefore should not be construed as limiting the present invention.

Herein, the terms "first", "second", etc. are used to distinguish different objects, rather than to describe a particular order. In this article, if there is a description of "several" and "multiple", the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, Within, etc., are understood to include this number.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

This part will describe the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. Each technical feature and overall technical solution of the invention should not be construed as limiting the protection scope of the invention.

1 to 4 , an embodiment of the present invention proposes a method for constructing I-beam scaffolding with a large-span cantilever structure for a high-rise cluster project, including the following steps:

1) Set up a plurality of horizontal cantilever beams 10, the horizontal cantilever beam 10 adopts I-beam, the end of the horizontal cantilever beam 10 away from the outer wall of the building is connected to the oblique hanging steel rope 20, and the other end of the oblique hanging steel rope 20 is located in the horizontal suspension. The top of the cantilever beam 10 is connected to the outer wall of the building. Two diagonal-pulling steel wire ropes are arranged at the position 31 of the outer pole.

In some embodiments, when the overhang length of the horizontal cantilever beam 10 is 1300mm and the anchoring length is 2000mm, 20a I-beam is used.

In other embodiments, when the overhang length of the horizontal cantilever beam 10 is 2000mm and the anchoring length is 3000mm, 25a I-beam is used, and the vertical rod components are the inner vertical rods 32 and neutral rods arranged in sequence from the inside to the outside. And the outer pole 31, that is, the three-layer pole.

2) Set up multiple groups of vertical rod assemblies: the vertical rod assemblies include parallel and spaced outer vertical rods 31 and inner vertical rods 32, the inner vertical rods 32 are arranged opposite to the outer wall of the building, and the outer vertical rods 31 and the inner vertical rods 32 pass through the horizontal The sweeping rod 33 is connected, and multiple sets of vertical pole assemblies are connected by the longitudinal sweeping rod 34. The vertical pole assembly is arranged on the horizontal cantilever beam 10, and the positioning steel bar with an outer diameter of 25mm is welded on the horizontal cantilever beam 10, and the vertical pole assembly is sleeved. Outside the positioning steel bars to ensure the stability of the frame body. The number of the vertical rod assemblies is the same as that of the horizontal cantilever beams 10 and is arranged one-to-one. The vertical deviation of each inner pole 32 and each outer pole 31 is controlled to be less than or equal to 100mm.

The horizontal cantilever beam 10 must ensure sufficient anchoring strength and section buckling resistance, and the longitudinal spacing of the horizontal cantilever beam 10 is the same as that of the vertical rod assembly. The outer vertical rod 31 and the inner vertical rod 32 are respectively formed by splicing and connecting a plurality of vertical rod pieces, and the vertical rod pieces are connected by butt joints. The outer vertical rod 31 and the inner vertical rod 32 are connected with the first cross rod 35 by right-angle fasteners, and the joint positions are arranged in a staggered manner. The joints of two adjacent vertical rods are avoided to appear in the same span and are staggered in the height direction. Not less than 50cm; the distance between the center of each joint and the main node is not more than 60cm.

3) Setting the first cross bar 35 and the second cross bar 36: a plurality of first cross bars 35 and a plurality of second cross bars 36 are arranged at intervals in the height direction of the vertical bar assembly, and the two ends of the first cross bar 35 are respectively In connection with the outer vertical rod 31 and the inner vertical rod 32 , in some embodiments, the two ends of the first transverse rod 35 are respectively away from the inner vertical rod 32 and the outer vertical rod 31 by an extension length of 150 mm. The second horizontal bar 36 is connected to the outer vertical bar 31 , the end of the second horizontal bar 36 is located at the junction of the first horizontal bar 35 and the outer vertical bar 31 , and the first horizontal bar 35 is arranged above the second horizontal bar 36 , in order to form the overall force of the space structure.

4) Set up the shear support assembly 37: the outer vertical rod 31 is connected with the shear support assembly 37, and the shear support assembly 37 is along the full width and height of the outer vertical rod 31 from the bottom to the top. Vertical shear brace assemblies 37 are provided in series. Continuing to refer to FIG. 4 , specifically, the angle 50 at which the shear brace assembly is erected is 45°˜60°.

It can be understood that the first shear strut and the second shear strut are formed by splicing a plurality of struts respectively, and are fixed by rotating fasteners, and the distance between the center line of the rotating fasteners and the main node is different. greater than 100mm.

It can be understood that, after the shearing support assembly 37 is installed, transverse diagonal braces 44 are arranged at the openings at both ends of the outer scaffold of the cantilever beam, and the transverse diagonal braces 44 are arranged continuously in a zigzag pattern from the bottom to the top in the same section. . The transverse diagonal brace 44 is fixed on the corresponding first transverse rod 35 by a rotating fastener. In some embodiments, when the transverse diagonal brace 44 spans two steps in a span, a first cross bar 35 is added at the intersecting second cross bar 36 to fix the transverse diagonal brace 44 on the added second cross bar 36 . On the protruding end of a cross bar 35.

5) Connecting wall construction: The vertical rod components are connected with the connecting wall parts 45 embedded in the outer wall of the building. It can be understood that the embedded connecting wall member 45 is a steel pipe or a steel bar. The connecting wall pieces 45 are arranged on each floor and three spans of the building body, and are arranged vertically on each floor. Encrypt in the corner range and at the top, that is, set up a pull node on each layer in the vertical direction within one meter of the corner.

The tie point should be firm to prevent it from moving and deforming. The tie point between the vertical rod assembly and the connecting wall piece 45 embedded in the outer wall of the building is set within 300mm of the connection point between the first crossbar 35 and the second crossbar 36. , when this length is exceeded, a pull node is added to pull the connecting wall piece 45 through and connect the inner pole 32 and the outer pole 31 firmly.

6) Unloading construction: After the strength of the connection between the inclined hanging steel rope 20 and the outer wall of the building reaches 100% of the design strength, the inclined hanging steel rope 20 is unloaded.

7) Setting up the scaffolding plate 42 and the foot retaining plate 41: the inner vertical rod 32 is connected with the foot retaining plate 41, and the foot retaining plate 41 is located between the inner vertical rod 32 and the outer wall of the building. A scaffolding board 42 is laid between the inner vertical rod 32 and the outer vertical rod 31 , and the scaffolding board 42 is arranged on the first horizontal rod 35 . It can be understood that the scaffolding board 42 is a bottom net. It should be understood that the pocket bottom net is a common part, and those skilled in the art are capable of selecting specifications, models and parameters according to actual needs. The scaffolding 42 must be fully laid in place, leaving no space. It can be understood that the foot guard 41 is a stamped steel plate, and the height of the foot guard 41 is 180 mm.

8) Setting up guardrails: guardrails 46 are fixed on the outer poles 31 , and the outer facades of the outer poles 31 are covered with dense mesh type safety nets 43 . Preferably, the hanging security mesh 43 is an 18# iron wire hanging safety net 43 . The guardrail 46 is set to be 1.2m high. The inner side of the outer scaffolding of the cantilever beam forms the edge, and the inner side of the outer scaffolding of the cantilever beam is provided with a 0.9m protective railing 46 and a 18cm high skirting bar.

The outer scaffolding of the cantilever beam is completely enclosed by formwork and wooden beams 47 within the range between the bottom outer pole 31 and the building sideline, and a 180mm high foot plate 41 is set to prevent falling objects from hurting people. A horizontal pocket net is set on the operation layer, and the scaffolding board 42 is fully covered, and the interface of the safety net 43 must be tightly connected. The safety net 43 must be tightly connected to the structure. Damaged and decayed safety nets are strictly prohibited43. The bottom and sides of the cantilever beam outer scaffold are hard sealed with plywood.

9) After the construction of the building is completed, remove the outer scaffolding of the cantilever beams: the removal direction is circularly removed from top to bottom according to the floor. When dismantling the frame, the work area should be divided, and ropes should be tied around the fence or a warning sign should be erected. The ground should be commanded by a special person, and non-operating personnel should not be allowed to enter.

The dismantling procedure should follow the principle of top-to-bottom, build first and then dismantle, first dismantle the scaffolding plate 42, the baffle plate 41 and the shear brace assembly 37, and then dismantle the first cross bar 35, the second cross bar 36 and the vertical bar assembly Wait.

It is not allowed to dismantle the rack separately or to dismantle the rack in two steps at the same time. Do it one step at a time, one shot at a time. When disassembling the outer pole 31 and the inner pole 32, you must first hold the pole and then disassemble the last two buckles. When removing the first cross bar 35, the transverse diagonal brace 44 and the scissor brace assembly, the middle fastener should be removed first, then hold the middle, and then unfasten the end fasteners. All connecting wall parts 45 must be lowered synchronously with the removal of the outer scaffolding of the cantilever beam. It is strictly forbidden to first remove the whole or several layers of the connecting wall parts 45 and then remove the outer scaffolding of the cantilever beam. If the height difference is greater than 2 steps, the connecting wall piece 45 should be added for reinforcement.

After dismantling, the stability of the frame body will not be damaged. For example, before the wall-attaching rods are dismantled, temporary supports should be added to prevent deformation. When the standard sections are dismantled, instability should be prevented.

When the outer scaffolding of the cantilever beam is dismantled to the last pole at the lower part, it should be temporarily reinforced at the appropriate position, and then the connecting wall piece 45 should be dismantled.

During the dismantling process, the same type of parts should be piled up in a centralized manner, and then transported to the ground using vertical transport equipment.

The removal of the horizontal cantilever beam 10 is mainly assisted by a tower crane, a powerful tool. When the frame body is disassembled to the horizontal cantilever beam 10, first install the lifting ring at 1/3-1/4 of the two ends of the horizontal cantilever beam 10 set as I-beam, and slowly lift it to make the lifting ring firm and the wire rope tight. After that, under the premise of ensuring safety and reliability, first remove the inclined hanging steel rope 20 at the cantilever end, and then remove the fixed pressure ring reinforcement bars and wedges of the horizontal cantilever beam 10.

The technical measures of the construction method and technical measures for the erection of the outer scaffolding of the cantilever beam of the present invention are: using the lightning protection system of the building, using the four corner vertical poles of the outer frame of the main building, and using A12 round steel to connect the first cross bar 35 with the lightning protection steel bars in the structural columns of the building, A lightning protection network is formed, and the detection grounding resistance is not greater than 4Ω.

Regularly inspect the outer scaffolding of the cantilever beams, find problems and hidden dangers, and repair and reinforce them in time before construction operations to achieve firmness and stability and ensure construction safety.

The scaffolding outside the cantilever beam is strictly prohibited from mixing steel, bamboo, steel and wood, and the mixing of fasteners, ropes, iron wires, bamboo strips, and plastic strips is prohibited.

It is strictly forbidden to have probe plates on the scaffolding board 42. When laying the scaffolding board 42 and multi-layer operations, the internal and external transmission of the construction load should be balanced as much as possible.

To ensure the integrity of the outer scaffolding body of the cantilever beam, it shall not be tied together with the derrick and the elevator, and the frame body shall not be cut off.

Strictly control the construction load, the scaffolding board 42 shall not be piled up and the construction load shall not be greater than 3kN/m2, so as to ensure a large safety reserve.

During construction, only one-story structure and decoration are allowed to operate at the same time, or the number of simultaneous operation layers during decoration construction shall not exceed two.

When the working floor is more than 3.6m higher than the lower connecting wall piece 45 and there is no connecting wall piece 45 on it, appropriate temporary stretching measures should be taken.

Reliable protective fences are set between each working layer to prevent falling objects from hurting people.

When the foundation elevations of the cantilever beams and the outer scaffolding of the same building are not the same, the first horizontal pole at the higher elevation must be set in a closed circle.

The safety technical measures for the dismantling of the outer scaffolding of the cantilever beam of the present invention are as follows: before the dismantling, the outer scaffolding of the cantilever beam to be dismantled is comprehensively inspected, and an operation plan is drawn up according to the inspection results.

When dismantling the frame, the work area should be divided, and ropes should be tied around the fence or a warning sign should be erected. The ground should be commanded by a special person, and non-operating personnel should not be allowed to enter.

When dismantling the pole, it is necessary to arrange two workers to cooperate to dismantle a pole. First, hold the pole and then disassemble the last two fasteners. The middle fastener should be removed first, then hold the middle, and then unfasten the end fasteners.

The connecting wall piece 45 shall be removed layer by layer with the progress of removal, and shall be supported by temporary supports before being removed.

By using the horizontal cantilever beam 10 of I-beam, the stability of the outer scaffold base is enhanced; the installation of the inclined hanging steel rope 20 can increase the strength of the horizontal cantilever beam 10; The upper part of 36 strengthens the strength of the entire frame body; along the full width and height of the outer elevation of the outer vertical rod 31 and from the bottom to the top, the shear brace assembly 37 is continuously arranged to further strengthen the strength of the frame body; The construction method has achieved the effect of improving the construction speed and enhancing the quality of construction.

The scaffold of the cantilever structure of the invention replaces the construction of high-rise buildings from the ground, and solves the defects of large consumables, long installation and disassembly time, long time, high cost, difficult installation and disassembly, high risk, and large material investment. Compared with the "pre-embedded ring" of the cable-stayed rope of the traditional cantilever frame, it saves labor and can be used multiple times. The length of the tie rod can be adjusted at any time to ensure the stability of the frame body, and the I-beam can be reused. In order to solve the construction problems of a plurality of super-long cantilever structures, the invention designs an I-beam cantilever frame platform with a cantilever length of 3.6 m and anchored on the main structure. In order to solve the eaves structure with different cantilever widths, the present invention selects an I-shaped rigid frame body structure which can be reasonably reused and freely combined into various widths. In order to solve the diversification of the height of the cantilevered structure, the present invention selects a suitable way of pulling up or supporting the frame body so as to improve the applicability and safety of the supporting frame body.

Specific examples are used herein to illustrate the principles and implementations of the present invention, and the descriptions of the above examples are only used to help understand the method and the core idea of the present invention. The above are only the preferred embodiments of the present invention. It should be pointed out that, due to the limitation of written expressions, there are objectively infinite specific structures. For those of ordinary skill in the art, without departing from the principles of the present invention, Several improvements, modifications or changes can also be made, and the above-mentioned technical features can also be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the concept and technical solutions of the invention are directly applied to other occasions without improvement, All should be regarded as the protection scope of the present invention.

Claims (10)

1. the construction method of the large-span cantilever structure construction I-beam scaffolding of high-rise cluster project, is characterized in that, comprises the steps: 1) Set up multiple horizontal cantilever beams: I-beams are used for horizontal cantilever beams, and one end of the horizontal cantilever beam far from the outer wall of the building is connected to the oblique hanging steel rope, and the other end of the oblique hanging steel rope is located above the horizontal cantilever beam and connected to the outer wall of the building; 2) Set up multiple sets of vertical pole components: the vertical pole components include external vertical poles and internal vertical poles arranged in parallel and at intervals, the internal vertical poles are arranged opposite to the outer wall of the building, and the external vertical poles and the internal vertical poles are connected by horizontal sweeping poles. The vertical pole components are connected by longitudinal sweeping poles, the vertical pole components are arranged on the horizontal cantilever beams, and the number of vertical pole components is the same as that of the horizontal cantilever beams and is arranged one-to-one; 3) Setting the first crossbar and the second crossbar: a plurality of first crossbars and a plurality of second crossbars are arranged at intervals in the height direction of the vertical rod assembly, and the two ends of the first crossbar are respectively connected with the outer vertical rod and the outer vertical rod. The inner vertical bar is connected, the second horizontal bar is connected to the outer vertical bar, the end of the second horizontal bar is located at the junction of the first horizontal bar and the outer vertical bar, and the first horizontal bar is arranged above the second horizontal bar; 4) Set up shear brace components: shear brace components are connected to the outer elevation of the outer pole, and vertical shear brace components are continuously arranged along the full width and height of the outer elevation of the outer pole and from the bottom to the top; 5) Connecting wall construction: The vertical rod components are tied and fixedly connected with the connecting wall parts embedded in the outer wall of the building; 6) Unloading construction: After the strength of the connection between the inclined hanging steel rope and the outer wall of the building reaches 100% of the design strength, unload the inclined hanging steel rope; 7) Set up the scaffolding board and the toeboard: the inner pole is connected with a toeboard, the toeboard is located between the inner pole and the outer wall of the building, and a scaffolding board is laid between the inner pole and the outer pole, and the scaffolding board is set on the first floor. on a crossbar; 8) Set up guardrails: guardrails are fixed on the outer poles, and the outer facades of the outer poles are covered with dense mesh safety nets; 9) After the construction of the building is completed, remove the outer scaffolding of the cantilever beam: first remove the scaffolding board, toe board and shear brace components, and then remove the first cross bar, second cross bar and vertical bar components. 2. the construction method of high-rise cluster project large-span cantilever structure construction I-beam scaffolding according to claim 1, is characterized in that: in step 1), when the overhang length of horizontal cantilever beam is 1300mm, the anchoring length is 2000mm , using 20a I-beam. 3. the construction method of high-rise cluster project large-span cantilever structure construction I-beam scaffolding according to claim 1, is characterized in that: in step 1), when the overhang length of horizontal cantilever beam is 2000mm, the anchoring length is 3000mm , using 25a I-beam. 4. the construction method of high-rise cluster project large-span cantilevered structure construction I-beam scaffolding according to claim 1, is characterized in that: in step 2), control the vertical deviation of each inner pole and each outer pole to be ≤ 100mm . 5. the construction method of high-rise cluster project large-span cantilevered structure construction I-beam scaffolding according to claim 1, is characterized in that: in step 3), the two ends of the first crossbar are respectively away from the inner pole and the outer pole The elongation length is 150mm. 6. The method for constructing I-beam scaffolding with a large-span cantilevered structure of a high-rise cluster project according to claim 1, characterized in that: in step 4), the angle at which the shear brace assembly is erected is 45° to 60°. 7. the construction method of high-rise cluster project large-span cantilevered structure construction I-beam scaffolding according to claim 1, is characterized in that: in step 4), after setting and completing the shear brace assembly, in two parts of the cantilever beam outer scaffolding. Horizontal diagonal bracing is arranged at the end opening, and the horizontal diagonal bracing is arranged continuously in a zigzag pattern from bottom to top. 8. the construction method of high-rise cluster project large-span cantilevered structure construction I-beam scaffolding according to claim 1, is characterized in that: in step 5), vertical rod assembly and the pre-buried connecting wall piece of building outer wall are tied together. The tie point is set within 300mm of the junction of the first crossbar and the second crossbar. 9. The construction method of the large-span cantilevered structure construction I-beam scaffolding of high-rise cluster project according to claim 1, is characterized in that: in step 7), the toe plate is a stamped steel plate, and the height of the toe plate is 180mm. 10. the construction method of high-rise cluster project large-span cantilevered structure construction I-beam scaffolding according to claim 1, is characterized in that: in step 2), welding on the horizontal cantilever beam is the positioning steel bar with an outer diameter of 25mm, vertical The rod assembly is seated outside the positioning reinforcement.

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