A large-span cantilever scaffolding foundation without top-back and its construction method

Abstract

The present invention relates to the technical field of suspended scaffolding support, specifically to a large-span cantilever scaffolding foundation without back-up support and a construction method thereof, comprising: a cantilever structural plate, the cantilever structural plate is cast on the outer side of a building column, and a connecting structural plate is provided at the connection between the cantilever structural plate and the building column; a reinforcing steel cage is fixed to one end of an internal I-beam and is located at the edge of the cantilever structural plate; one end of the scaffolding cantilever I-beam extends to the outer side of the cantilever structural plate; the beneficial effect is: by pre-arranging internal I-beams and reinforcing crossbeams inside the cantilever structural plate, the scaffolding cantilever I-beams arranged on the upper surface of the cantilever structural plate are fixed to the reinforcing crossbeams and the reinforcing steel cage respectively through two positioning components, so that the building column can share the supporting force of the cantilever structural plate, and further, the deformation and damage of the cantilever structural plate can be avoided without setting back-up support, thereby reducing the support cost of the scaffolding and shortening the construction period.

Description

Technical Field

[0001] The invention relates to the technical field of suspended scaffolding supports, in particular to a top-return-free large-span cantilever scaffolding foundation and a construction method thereof. Background Art

[0002] Cantilever scaffolding is a commonly used external frame erection method. It uses I-beams as the main beams placed on the structure, cantilevered to a certain length, and then erected scaffolding on the cantilevered I-beams to serve as external operating frames and protection during the construction of the main structure of the building.

[0003] In the prior art, when there is a large-span cantilever structure on the outside of a building, a cantilever scaffolding is generally installed above the cantilever structure. The scaffolding is supported by installing an I-beam on the upper surface of the cantilever structure and extending one end of the I-beam to the outside of the cantilever structure.

[0004] However, since the cantilever structure itself has a certain width and limited load, the I-beams used for scaffolding support installed on its surface need to be of a certain length, and a top-return support must be installed under the cantilever. This not only increases the cost of scaffolding installation, but also requires the top-return support to be disassembled after the scaffolding is dismantled, thereby extending the entire construction period. To this end, the present invention proposes a large-span cantilever scaffolding foundation without top-return and its construction method to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a large-span cantilever scaffolding foundation without top-return support and its construction method, so as to solve the problem proposed in the above background technology that the cost of supporting the cantilever scaffolding on the outside of the cantilever structure of the building is high and additional top-return support is required.

[0006] To achieve the above object, the present invention provides the following technical solution: a large-span cantilever scaffolding foundation without top-back, comprising:

[0007] A cantilevered structural plate, wherein the cantilevered structural plate is cast on the outside of a building column, and a connecting structural plate is provided at the connection between the cantilevered structural plate and the building column, and a built-in I-beam and a reinforcing beam are provided through the side of the connecting structural plate, and the built-in I-beam and the reinforcing beam are perpendicular to each other;

[0008] A reinforcement steel cage is fixed to one end of the built-in I-beam and is located at the edge of the cantilevered structural plate;

[0009] A scaffolding cantilever I-beam is provided on the upper surface of the cantilevered structural plate, one end of the scaffolding cantilevered I-beam extends outward from the cantilevered structural plate, and the middle part and the other end of the scaffolding cantilevered I-beam are fixedly connected to the reinforced steel cage and the reinforced crossbeam respectively through positioning components.

[0010] Preferably, each of the connecting structural plates is provided with two built-in I-beams and two reinforcing beams distributed in a "well" shape, and the two reinforcing beams are respectively located on the upper and lower sides of the built-in I-beams.

[0011] Preferably, the positioning assembly includes two U-shaped frames, and the two U-shaped frames are respectively located on both sides of the scaffolding cantilever I-beam, and a clamping plate is provided between the upper ends of the two U-shaped frames, and the clamping plate is pressed on the upper surface of the scaffolding cantilever I-beam through a fastening nut.

[0012] Preferably, the two positioning components located at the middle and the other end of the cantilevered I-beam of the scaffolding are respectively tied to a reinforcing steel cage and a reinforcing beam, and two symmetrically distributed pressure angle steels are arranged above the reinforcing steel cage. The pressure angle steels are fixedly welded to the U-shaped frame on the positioning component, and the lower end edge of the pressure angle steel rests on the upper surface of the reinforcing steel cage.

[0013] Preferably, the reinforced steel cage includes a first main reinforcement and a second main reinforcement, the first main reinforcement and the second main reinforcement are both tied to the outside of the ends of the two built-in I-beams and welded to each other, and the outsides of the first main reinforcement and the second main reinforcement are both tied with tying reinforcement.

[0014] Preferably, a plurality of the binding bars are provided, and the plurality of the binding bars are distributed at equal intervals along the length direction of the reinforced steel cage.

[0015] Preferably, square connecting ribs are provided inside the connecting structural plate, and the connecting ribs are tied to the outside of the two binding ribs. There are four connecting ribs and they are respectively located on both sides of the two built-in I-beams.

[0016] Preferably, the connecting structural plate and the cantilever structural plate are both formed by pouring concrete, and the first main reinforcement, the second main reinforcement, the binding reinforcement and the connecting reinforcement are all made by bending steel bars.

[0017] A construction method for the above-mentioned large-span cantilever scaffolding foundation without top-back, specifically comprising the following steps:

[0018] Step 1: Cast the connecting structure plate. Install built-in I-beams on both sides of the building column. Install reinforcement beams on the other two sides of the building column. The two reinforcement beams are located on the upper and lower sides of the built-in I-beams respectively. The built-in I-beams and reinforcement beams are tied and positioned by connecting ribs. Then, the casting formwork of the connecting structure plate is supported and concrete slurry is poured.

[0019] Step 2: Cast the cantilever structural plate. After the connecting structural plate solidifies and takes shape, tie the reinforcement steel cage to the front end of the built-in I-beam, and tie the positioning components to the reinforcement steel cage and one of the reinforcement beams. Then, set up the casting formwork of the cantilever structural plate and pour the concrete slurry.

[0020] Step 3: Install the cantilever I-beam of the scaffolding. After the cantilever structural slab solidifies and forms, place the cantilever I-beam of the scaffolding on the upper surface of the cantilever structural slab, and ensure that the front end of the cantilever I-beam of the scaffolding extends outside the cantilever structural slab. Then, fix the cantilever I-beam of the scaffolding to the positioning component through the pressing plate and the fastening nut.

[0021] Step 4: Erect the cantilever scaffolding. After fixing and installing multiple cantilever I-beams of the scaffolding on the upper surface of the cantilever structural slab according to the above steps, erect the scaffolding at the front end of the cantilever I-beam of the scaffolding.

[0022] Preferably, in the second step, during the binding process of the reinforcing steel cage, the first main reinforcement and the second main reinforcement are bent into a "匚" shape, and the openings face opposite sides respectively. The reinforcing steel cages are tied and connected with each other using thin steel wires.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] In the present invention, by pre-setting the built-in I-beam and the reinforcing cross beam inside the cantilever structural slab, the built-in I-beam and the reinforcing cross beam are fixed in a grid pattern around the building column. The reinforcing steel cage is tied at the front end of the built-in I-beam to reinforce the overall strength of the cantilever structural slab. The cantilever I-beam of the scaffolding arranged on the upper surface of the cantilever structural slab is fixed to the reinforcing cross beam and the reinforcing steel cage respectively through two positioning components, so as to transfer the stress points of the cantilever structural slab to the reinforcing cross beam and the built-in I-beam, enabling the building column to share the supporting force of the cantilever structural slab. Furthermore, it is possible to avoid deformation and damage of the cantilever structural slab without setting the back support, reducing the erection cost of the scaffolding and shortening the construction period at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the internal structure of the cantilever structural slab of the present invention;

[0027] Figure 3 It is a schematic diagram of the installation of the cantilever I-beam structure of the scaffolding of the present invention;

[0028] Figure 4 It is a three-dimensional schematic diagram of the structure of the reinforcing steel cage and the positioning component of the present invention;

[0029] Figure 5 It is a semi-sectional schematic diagram of the connecting structural slab of the present invention.

[0030] In the figure: 1. Cantilevered structural plate; 2. Building column; 3. Connecting structural plate; 4. Built-in I-beam; 5. Reinforced beam; 6. Reinforced steel cage; 7. Scaffolding cantilevered I-beam; 8. Positioning assembly; 9. U-shaped frame; 10. Clamping plate; 11. Fastening nut; 12. Pressure angle steel; 13. First main reinforcement; 14. Second main reinforcement; 15. Tie reinforcement; 16. Connecting reinforcement. DETAILED DESCRIPTION

[0031] In order to clearly and completely describe the objectives and technical solutions of the present invention and make the advantages more clearly understood, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," "horizontal," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "one," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0034] For the purpose of simplicity and illustration, the principles of the embodiments are described primarily with reference to examples. In the following description, many specific details are provided to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures are not described in detail to avoid unnecessarily obscuring the understanding of these embodiments. In addition, all embodiments may be used in combination with each other.

[0035] See also Figures 1 to 5 , the present invention provides a technical solution:

[0036] Example 1

[0037] A large-span cantilever scaffolding foundation without top-back comprises a cantilever structural plate 1, a reinforced steel cage 6 and a scaffolding cantilever I-steel 7.

[0038] Specifically, the cantilever structural plate 1 is cast on the outside of the building column 2, and a connecting structural plate 3 is provided at the connection between the cantilever structural plate 1 and the building column 2. The building column 2 is used to support the cantilever structural plate 1. The connecting structural plate 3 is used to strengthen the connection strength between the cantilever structural plate 1 and the building column 2, while preventing water seepage. The side of the connecting structural plate 3 is penetrated by a built-in I-beam 4 and a reinforcing beam 5, and the built-in I-beam 4 and the reinforcing beam 5 are perpendicular to each other. The built-in I-beam 4 and the reinforcing beam 5 are used to improve the strength of the cantilever structural plate 1 after casting.

[0039] Secondly, the reinforcement steel cage 6 is fixed to one end of the built-in I-beam 4 and is located at the edge of the cantilevered structural plate 1. The setting of the reinforcement steel cage 6 is used to reinforce the edge of the cantilevered structural plate 1 to improve the strength of this position;

[0040] Furthermore, a scaffolding cantilever I-beam 7 is provided on the upper surface of the cantilevered structural plate 1, one end of the scaffolding cantilevered I-beam 7 extends outward from the cantilevered structural plate 1, and the middle portion and the other end of the scaffolding cantilevered I-beam 7 are fixedly connected to the reinforcement steel cage 6 and the reinforcement beam 5 respectively through a positioning assembly 8, as shown in FIG. Figure 1 As shown, a plurality of scaffold cantilever I-steels 7 are installed side by side to support the installation of subsequent cantilever scaffolds.

[0041] Example 2

[0042] On the basis of Example 1, in order to reduce the force exerted by the cantilever scaffolding on the cantilever structural plate 1, each connecting structural plate 3 of the present application is provided with two built-in I-beams 4 and two reinforcing beams 5 and are distributed in a "well" shape, and the two reinforcing beams 5 are respectively located on the upper and lower sides of the built-in I-beam 4, such as Figure 3 and Figure 5As shown, when the front end of the scaffolding cantilever I-beam 7 is subjected to force, the reinforcing steel cage 6 shares the gravity exerted on the scaffolding cantilever I-beam 7. Since the reinforcing steel cage 6 is located at one end of the built-in I-beam 4, the built-in I-beam 4 transfers the force exerted on it to the two reinforcing beams 5 at the same time according to the principle of leverage, thereby reducing the force exerted on itself. In other words, when the device is used to support the cantilever scaffolding, the gravity of the scaffolding can be dispersed to the built-in I-beam 4 and the reinforcing beam 5, and then the force exerted on the built-in I-beam 4 and the reinforcing beam 5 is supported by the building columns 2. There is no need to support the cantilever structural plate 1 back to the top, thereby simplifying the construction steps and shortening the construction period.

[0043] Example 3

[0044] On the basis of Example 2, in order to install and position the scaffolding cantilever I-beam 7, the positioning assembly 8 of the present application includes two U-shaped frames 9, and the two U-shaped frames 9 are respectively located on both sides of the scaffolding cantilever I-beam 7, and a clamping plate 10 is arranged between the upper ends of the two U-shaped frames 9. The clamping plate 10 is pressed on the upper surface of the scaffolding cantilever I-beam 7 by tightening the clamping nut 11. By tightening the clamping nut 11, the clamping plate 10 can be pressed on the upper surface of the scaffolding cantilever I-beam 7 to fix the scaffolding cantilever I-beam 7 in position.

[0045] In addition, the two positioning components 8 located in the middle and the other end of the scaffolding cantilever I-beam 7 are respectively tied to the reinforcement steel cage 6 and a reinforcement beam 5. Two symmetrically distributed pressure angle steels 12 are set above the reinforcement steel cage 6. The pressure angle steel 12 is fixedly welded to the U-shaped frame 9 on the positioning component 8. The lower end edge of the pressure angle steel 12 is against the upper surface of the reinforcement steel cage 6. Figure 3 and Figure 4 It can be seen that the middle part of the cantilevered I-beam 7 of the scaffolding applies a downward force to the reinforcing steel cage 6, and the rear end of the reinforcing steel cage 6 applies an upward force to the reinforcing beam 5 according to the lever principle. Therefore, the pressure-bearing angle steel 12 is welded inside the positioning component 8 located on the reinforcing steel cage 6, which can transfer the downward pressure on the positioning component 8 to the reinforcing steel cage 6, thereby avoiding deformation and damage of the positioning component 8 at this location, and reducing the cracking of the concrete of the cantilevered structural plate 1 at this location due to excessive pressure.

[0046] Example 4

[0047] On the basis of Example 3, in order to describe the structure of the reinforcement steel cage 6 in detail, the reinforcement steel cage 6 of the present application includes a first main reinforcement 13 and a second main reinforcement 14, the first main reinforcement 13 and the second main reinforcement 14 are tied to the outside of the ends of the two built-in I-beams 4 and welded to each other, and the outsides of the first main reinforcement 13 and the second main reinforcement 14 are tied with tying reinforcements 15, and a plurality of tying reinforcements 15 are provided, and the plurality of tying reinforcements 15 are evenly spaced along the length direction of the reinforcement steel cage 6, combined with Figure 2 and Figure 4 The first main reinforcement 13 and the second main reinforcement 14 can reinforce the strength of the edge of the cantilevered structural plate 1, and the binding reinforcement 15 is used to bind and fix the first main reinforcement 13 and the second main reinforcement 14 to each other.

[0048] Example 5

[0049] On the basis of Example 4, in order to fix the built-in I-beam 4 and the reinforcing beam 5, the present application also has square connecting ribs 16 arranged inside the connecting structure plate 3, and the connecting ribs 16 are tied to the outside of the two binding ribs 15. There are four connecting ribs 16 and they are respectively located on both sides of the two built-in I-beams 4, which are used to fix the built-in I-beam 4 and the reinforcing beam 5 on the side of the building column 2, and to improve the structural strength of the connecting structure plate 3 after casting.

[0050] Example 6

[0051] On the basis of Example 5, in order to reduce the construction difficulty, the connecting structure plate 3 and the cantilever structure plate 1 of the present application are both formed by pouring concrete, and the first main reinforcement 13, the second main reinforcement 14, the binding reinforcement 15 and the connecting reinforcement 16 are all made by bending steel bars, which can be bent in advance. Only binding or a small amount of welding is required during installation, thereby reducing the construction difficulty.

[0052] A construction method for the above-mentioned large-span cantilever scaffolding foundation without top-back, specifically comprising the following steps:

[0053] Step 1: Cast the connecting structure plate 3. Install built-in I-beams 4 on both sides of the building column 2. Install reinforcement beams 5 on the other two sides of the building column 2. The two reinforcement beams 5 are respectively located on the upper and lower sides of the built-in I-beams 4. Tie the built-in I-beams 4 and the reinforcement beams 5 together through the connecting ribs 16 to position them. Then, set up the casting formwork for the connecting structure plate 3 and pour concrete slurry.

[0054] Step 2: Cast the cantilever structure plate 1. After the connecting structure plate 3 is solidified and formed, tie the reinforcement steel cage 6 to the front end of the built-in I-beam 4, and tie the positioning assembly 8 to the reinforcement steel cage 6 and one of the reinforcement beams 5. Then, set up the casting formwork of the cantilever structure plate 1 and pour the concrete slurry.

[0055] Step 3: Install the scaffolding cantilever I-beam 7. After the cantilever structure plate 1 is solidified and formed, place the scaffolding cantilever I-beam 7 on the upper surface of the cantilever structure plate 1, and ensure that the front end of the scaffolding cantilever I-beam 7 extends to the outside of the cantilever structure plate 1. Then, fix the scaffolding cantilever I-beam 7 to the positioning assembly 8 through the clamping plate 10 and the fastening nut 11.

[0056] Step 4. Erect the cantilever scaffold. After fixing and installing multiple scaffold cantilever I-beams 7 on the upper surface of the cantilever structural slab 1 according to the above steps, the scaffold can be erected at the front end of the scaffold cantilever I-beam 7.

[0057] Embodiment 7

[0058] On the basis of Embodiment 6, in order to ensure the stable connection between the reinforcement steel cage 6 and the built-in I-beam 4, in Step 2 of the present application, during the binding process of the reinforcement steel cage 6, the first main reinforcement 13 and the second main reinforcement 14 are bent into a "C" shape, and the openings face opposite sides respectively. The reinforcement steel cages 6 adjacent to each other are connected by binding with thin steel wires. The first main reinforcement 13 and the second main reinforcement 14 can be bent in advance or according to the actual on-site requirements. After bending, they are bound or welded to each other, which can effectively improve the connection strength between the two and achieve a stable binding effect on the built-in I-beam 4.

[0059] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-span cantilever scaffolding foundation without top-back, characterized by: include: A cantilevered structural plate (1), wherein the cantilevered structural plate (1) is cast on the outside of a building column (2), a connecting structural plate (3) is provided at the connection between the cantilevered structural plate (1) and the building column (2), a built-in I-beam (4) and a reinforcing beam (5) are provided through the side of the connecting structural plate (3), and the built-in I-beam (4) and the reinforcing beam (5) are perpendicular to each other; A reinforcement steel cage (6), wherein the reinforcement steel cage (6) is fixed to one end of the built-in I-beam (4) and is located at the edge of the cantilevered structural plate (1); A scaffolding cantilever I-beam (7), wherein the scaffolding cantilever I-beam (7) is arranged on the upper surface of the cantilevered structural plate (1), one end of the scaffolding cantilevered I-beam (7) extends to the outside of the cantilevered structural plate (1), and the middle portion and the other end of the scaffolding cantilevered I-beam (7) are fixedly connected to the reinforcement steel cage (6) and the reinforcement crossbeam (5) respectively through a positioning component (8).

2. The large-span cantilever scaffolding foundation without top-back according to claim 1 is characterized by: Two built-in I-beams (4) and two reinforcing beams (5) are provided on each of the connecting structural plates (3) and are distributed in a "well" shape, and the two reinforcing beams (5) are respectively located on the upper and lower sides of the built-in I-beams (4).

3. The large-span cantilever scaffolding foundation without top-back according to claim 2 is characterized by: The positioning assembly (8) includes two U-shaped frames (9), and the two U-shaped frames (9) are respectively located on both sides of the scaffolding cantilever I-beam (7), and a clamping plate (10) is provided between the upper ends of the two U-shaped frames (9), and the clamping plate (10) is pressed on the upper surface of the scaffolding cantilever I-beam (7) through a fastening nut (11).

4. The large-span cantilever scaffolding foundation without top-back according to claim 3 is characterized by: Two positioning components (8) located at the middle and the other end of the cantilevered I-beam (7) of the scaffold are respectively tied to the reinforcing steel cage (6) and a reinforcing crossbeam (5). Two symmetrically distributed pressure angle steels (12) are arranged above the reinforcing steel cage (6). The pressure angle steels (12) are fixedly welded to the U-shaped frame (9) on the positioning component (8), and the lower end edge of the pressure angle steel (12) abuts against the upper surface of the reinforcing steel cage (6).

5. The large-span cantilever scaffolding foundation without top-back according to claim 4 is characterized by: The reinforcing steel cage (6) comprises a first main reinforcement (13) and a second main reinforcement (14), wherein the first main reinforcement (13) and the second main reinforcement (14) are both tied to the outside of the ends of the two built-in I-beams (4) and welded to each other, and the outside of the first main reinforcement (13) and the second main reinforcement (14) are both tied with tying reinforcements (15).

6. The large-span cantilever scaffolding foundation without top-back according to claim 5 is characterized by: A plurality of the binding bars (15) are provided, and the plurality of the binding bars (15) are distributed at equal intervals along the length direction of the reinforcement steel cage (6).

7. The large-span cantilever scaffolding foundation without top-back according to claim 6 is characterized by: The connecting structural plate (3) is provided with square connecting ribs (16) inside, and the connecting ribs (16) are tied to the outside of two tying ribs (15). Four connecting ribs (16) are provided and are respectively located on both sides of the two built-in I-beams (4).

8. The large-span cantilever scaffolding foundation without top-back according to claim 7 is characterized by: The connecting structural plate (3) and the cantilever structural plate (1) are both formed by pouring concrete, and the first main reinforcement (13), the second main reinforcement (14), the binding reinforcement (15) and the connecting reinforcement (16) are all made by bending steel bars.

9. A construction method for a large-span cantilever scaffolding foundation without top-back according to claim 8, characterized in that: The specific steps include: Step 1: Pour the connecting structural slab (3). Erect the built-in I-beams (4) on both sides of the building column (2), and erect the reinforcement cross beams (5) on the other two sides of the building column (2). The two reinforcement cross beams (5) are respectively located on the upper and lower sides of the built-in I-beams (4). Use the connecting bars (16) to bind and position the built-in I-beams (4) and the reinforcement cross beams (5), and then set up the pouring formwork of the connecting structural slab (3) and pour the concrete slurry. Step 2: Pour the cantilever structural slab (1). After the connecting structural slab (3) solidifies and forms, bind the reinforcement steel cage (6) at the front end of the built-in I-beam (4), and bind the positioning component (8) on the reinforcement steel cage (6) and one of the reinforcement cross beams (5). Then set up the pouring formwork of the cantilever structural slab (1) and pour the concrete slurry. Step 3: Install the scaffolding cantilever I-beam (7). After the cantilever structural slab (1) solidifies and forms, place the scaffolding cantilever I-beam (7) on the upper surface of the cantilever structural slab (1), and ensure that the front end of the scaffolding cantilever I-beam (7) extends outside the cantilever structural slab (1). Then fix the scaffolding cantilever I-beam (7) to the positioning component (8) through the pressing plate (10) and the fastening nut (11). Step 4: Erect the cantilever scaffolding. After fixing and installing multiple scaffolding cantilever I-beams (7) on the upper surface of the cantilever structural slab (1) according to Step 3 above, erect the scaffolding at the front end of the scaffolding cantilever I-beam (7).

10. The construction method of the large-span cantilever scaffolding foundation without top-back according to claim 9 is characterized in that: In Step 2, during the binding process of the reinforcement steel cage (6), bend the first main reinforcement (13) and the second main reinforcement (14) into a "匚" shape, and the openings face opposite sides respectively. The reinforcement steel cages (6) are tied and connected to adjacent reinforcement steel cages (6) using thin steel wires.

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