A cantilever steel structure construction platform with a formwork support system and a construction method

Abstract

The present invention discloses a cantilever steel structure construction platform with a formwork support system and a construction method, belonging to the technical field of building construction. The steel platform in the cantilever steel structure construction platform is composed of a number of cantilever beams and edge beams. One end of the cantilever beam is vertically fixed on the first main structural beam, and the other end extends towards the direction away from the building where the first main structural beam is located to form a cantilever end. Ear plates are arranged on the cantilever end and are respectively connected to the second main structural beam and the third main structural beam through tie rods and steel wires. A formwork support system is arranged below the cantilever beam, including end plates, cushion blocks, formworks and truss-type supports. Both ends of the truss-type support are fixedly connected to the connectors fixed on the web of the cantilever beam through end plates, so that the truss-type support is arranged below the cantilever beam to support the steel platform. The cantilever steel structure construction platform provided in this embodiment is convenient to erect, and for the ultra-long high-altitude cantilever structure, it avoids the problem of excessive height caused by formwork support at the bottom.

Description

Technical Field

[0001] The invention belongs to the technical field of building engineering construction, and particularly relates to a cantilever steel structure construction platform with a formwork system and a construction method. Background Art

[0002] Due to the functional requirements of the building, the structural design involves extremely long, high-altitude cantilever structures (such as cantilevered concrete balconies and bay windows). These cantilever structures extend largely or entirely beyond the existing structure, leaving no load-bearing structure below or at the outermost edge. This presents significant construction risks and technical challenges. Traditionally, cantilever structure construction involves erecting a steel-rod cantilever scaffolding operating platform, with steel braces attached below to ensure the platform's safety. The upper portion is used for tie rod connection, formwork erection, and reinforced concrete construction.

[0003] The Chinese utility model patent with the authorization announcement number CN 217949328U discloses a load-bearing system for a cantilever structure, specifically disclosing that the cantilever structure includes a main structure, a steel truss, and at least two cantilever structures arranged in a vertical direction. The steel truss is erected on the main structure, and the cantilever structure is arranged vertically below the steel truss. The cantilever structure includes a cantilever beam and a hanger. All hangers are inclined from top to bottom toward the main structure. In the above patent, the frame of the steel tie rod cantilever scaffolding operating platform is complicated to erect, and the installation and dismantling of the steel diagonal braces and hangers are difficult, which affects the construction progress and civilized construction on site, and there are great safety risks.

[0004] Therefore, there is an urgent need to develop a temporary formwork platform that is convenient for setting up ultra-long high-altitude cantilever structures. Summary of the Invention

[0005] The purpose of the present invention is to address the deficiencies of the existing technology and to provide a cantilever steel structure construction platform and construction method with a formwork system to meet the construction needs of ultra-long high-altitude cantilever structures, solve the safety problems of traditional steel tie-rod cantilever scaffolding and formwork support construction processes, and provide temporary support for cantilever structure construction.

[0006] The specific technical solutions adopted in the present invention are as follows:

[0007] In a first aspect, the present invention provides a cantilever steel structure construction platform with a formwork system, comprising a cantilever steel structure construction platform and a formwork system. The cantilever steel structure construction platform comprises an operating frame and a steel platform.

[0008] The operating platform is arranged on the lower layer of the floor where the steel platform is located, and its width is greater than that of the upper steel platform. The steel platform includes several cantilever beams and edge beams. The cantilever beams are arranged at intervals in a horizontal posture, and one end of each cantilever beam is vertically fixed to the first main structural beam through several fasteners arranged on the stiffening plate. The other end of the cantilever beam extends towards the direction away from the building where the first main structural beam is located to form a cantilever end. The first main structural beam is the main structural beam of the floor where the steel platform needs to be set. The main structural beams on the first floor above and the second floor above the first main structural beam are the second main structural beam and the third main structural beam respectively. Both ends of each edge beam are fixed between the cantilever ends of two adjacent cantilever beams.

[0009] Double-layer ear plates and single-layer ear plates are arranged from outside to inside on the cantilever end of the cantilever beam. Double-layer ear plates are provided on the second main structural beam, and single-layer ear plates are provided on the third main structural beam. A tie rod for ensuring the safety of the steel platform is provided between the double-layer ear plates on the cantilever end of the cantilever beam and the second main structural beam. Both ends of the tie rod are fixedly connected by bolts between the double-layer ear plates. A steel wire rope is provided between the single-layer ear plates on the cantilever end of the cantilever beam and the third main structural beam. Both ends of the steel wire rope respectively pass through the holes on the single-layer ear plates and are fastened by rope clamps.

[0010] The formwork support system includes end plates, cushion blocks, formwork and truss supports. Formwork for pouring the cast-in-place concrete floor slab is laid above the cantilever beam. Holes for fixing connecting pieces are opened on the web of the cantilever beam. The truss support is arranged between two adjacent cantilever beams, and end plates are respectively fixed at both ends of the truss support. The connecting piece passes through the hole on the web of the cantilever beam and is fixedly connected with the end plate, so that the truss support is arranged below the cantilever beam to support the steel platform. Cushion blocks are also arranged at intervals between the formwork and the truss support.

[0011] Preferably, the above-mentioned stiffening plate is fixed to the first main structural beam by fillet welding.

[0012] Preferably, the above-mentioned fasteners are anchor bolts.

[0013] Furthermore, the above-mentioned anchor bolts are M20 high-strength anchor bolts.

[0014] Preferably, both ends of the above-mentioned edge beam are fixedly connected to the cantilever beam by bolt connection.

[0015] Preferably, the above-mentioned bolts are M22 high-strength bolts.

[0016] Preferably, both the above-mentioned cantilever beam and the edge beam are made of steel beams. The cross-sectional size of the cantilever beam is 400×200×8×13mm, and the cross-sectional size of the edge beam is 250×125×6×9mm.

[0017] Preferably, the above-mentioned tie rod is made of a Ф120×6 steel bar; the steel wire rope is made of a Ф18 steel wire rope.

[0018] Preferably, the cushion block is a square timber with a size of 80×60mm.

[0019] Preferably, the formwork is a glued laminated wood formwork.

[0020] In a second aspect, the present invention provides a construction method for the construction platform described in the first aspect, specifically as follows:

[0021] S1: Set up an operating frame on the lower layer where the steel platform needs to be installed. The operating frame is set up as a cantilevered I-beam to form a single-layer cantilevered external frame, with three rows of vertical poles, and the width of the operating frame is greater than that of the upper steel platform.

[0022] S2: After the operating frame is set up, hoist the cantilever beam and the edge beam. One end of the cantilever beam is vertically fixed to the first main structural beam through a number of fasteners provided on the stiffening plate. A sealing steel beam is added to the other end of the cantilever beam, and both ends of the edge beam are fixedly connected to the cantilever beam by bolt connection. During the installation process, a total station and a spirit level are used to ensure the construction accuracy of the cantilever beam and the edge beam, and the installation of the steel platform is completed.

[0023] S3: A tie rod connection is provided between the cantilever end of the cantilever beam and the double-layer ear plates on the second main structural beam. Both ends of the tie rod extend between the double-layer ear plates and are fixedly connected by bolts. A wire rope connection is provided between the cantilever end of the cantilever beam and the single-layer ear plate on the third main structural beam. Both ends of the wire rope pass through the holes on the single-layer ear plate and are fastened by wire rope clamps.

[0024] S4: After the installation of the steel platform is completed, a truss-type support is provided between adjacent two cantilever beams. Holes are opened on the web of the cantilever beam, and the connecting piece passes through the holes and is fixed on the cantilever beam. A formwork for pouring the cast-in-place concrete floor slab is laid above the cantilever beam. The end plates at both ends of the truss-type support are fixedly connected to the connecting pieces on the cantilever beam, so that the truss-type support is arranged below the cantilever beam to support the steel platform. A number of cushion blocks are also spaced between the formwork and the truss-type support to form a formwork support system with a transparent upper and lower space.

[0025] S5: After the formwork is laid and the steel bars are tied, concrete is poured to form a cast-in-place concrete floor slab, and regular maintenance is carried out after pouring.

[0026] S6: After the concrete maintenance is completed, the tie rod and the wire rope are removed. The cantilever beam and the edge beam are segmented and cut by using the lower operating frame and transported away from the construction site.

[0027] The present invention has the following beneficial effects compared with the prior art:

[0028] The support steel platform provided by the present invention forms a stable triangular force transmission system through steel wire ropes and tie rods, improving the construction accuracy, flatness and safety of the steel platform at high altitudes. The present invention also provides a truss formwork support system under the support steel platform to ensure the formwork support and construction safety of the cantilever structure. For the ultra-long high-altitude cantilever structure, the problem of excessive height caused by bottom formwork support is avoided. The cantilever steel structure construction platform provided by the present invention is convenient to erect, can improve the construction efficiency and speed up the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the connection of the steel platform provided for this embodiment;

[0030] Figure 2 It is a schematic diagram of the connection between the cantilever beam and the first main structural beam in this embodiment;

[0031] Figure 3 It is a schematic diagram of the connection between the cantilever beam and the edge sealing beam in this embodiment;

[0032] Figure 4 It is a schematic diagram of the lower connection node of the tie rod in this embodiment;

[0033] Figure 5 It is a schematic diagram of the upper connection node of the tie rod in this embodiment;

[0034] Figure 6 It is a schematic diagram of the formwork support system structure in this embodiment;

[0035] Figure 7 It is a schematic diagram of the hole opening of the cantilever beam in this embodiment;

[0036] In the figure: cantilever beam 1, first main structural beam 2, double-layer ear plate 3, single-layer ear plate 4, tie rod 5, steel wire rope 6, stiffening plate 7, second main structural beam 8, edge sealing beam 9, fastener 10, third main structural beam 11, connecting piece 12, end plate 13, cast-in-place concrete floor slab 14, cushion block 15, formwork 16, truss support 17. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be made with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below. The technical features in the various embodiments of the present invention can be combined correspondingly without conflict.

[0038] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0039] In the description of the present invention, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element or indirectly connected, i.e., there is an intermediate element. On the contrary, when an element is called "connected" to another element, there is no intermediate element.

[0040] As a preference in a specific embodiment, this embodiment provides a cantilever steel structure construction platform with a formwork support system, which includes a cantilever steel structure construction platform and a formwork support system.

[0041] The cantilever steel structure construction platform includes an operation frame and a steel platform. The operation frame is arranged on the lower layer of the floor where the steel platform is located. The width by which the operation frame cantilevers out of the original structure is greater than that of the steel platform, and the periphery is higher than the structural surface of the steel platform, so as to support the installation and demolition construction of the steel platform. At the same time, a rigid isolation is carried out below to achieve a safety protection effect.

[0042] The operation frame includes a cantilever I-beam and a steel pipe scaffold. The cantilever I-beam is placed on the original structure of the lower layer of the cantilever steel platform. One end of the I-beam extends into the original structure and is fixedly connected to the original structure through embedded bolts; the other end cantilevers out of the original structure, and a steel pipe scaffold is erected above the cantilever part of the I-beam, which is composed of three rows of vertical poles and corresponding crossbars, and the steel pipes are tightly connected through fasteners.

[0043] The first main structural beam 2 is the main structural beam of the floor where the steel platform needs to be set. The main structural beams of the upper first floor and the upper second floor of the first main structural beam 2 are the second main structural beam 8 and the third main structural beam 11 respectively.

[0044] As Figure 1 shown, the steel platform includes several cantilever beams 1 and edge-sealing beams 9. In this embodiment, both the cantilever beams 1 and the edge-sealing beams 9 are made of steel beams. The cross-sectional size of the cantilever steel beam is 400×200×8×13 mm, and the cross-sectional size of the edge-sealing steel beam is 250×125×6×9 mm.

[0045] The cantilever beams 1 are arranged at intervals in a horizontal posture, and one end of each cantilever beam 1 is vertically fixed to the first main structural beam 2. The other end of the cantilever beam 1 extends towards the direction away from the building where the first main structural beam 2 is located to form a cantilever end. The cantilever beam 1 and the first main structural beam 2 are connected by a stiffening plate 7, and the stiffening plate 7 and the first main structural beam 2 are fixedly connected by fillet welding. A hole is provided on the stiffening plate 7, and a number of fasteners 10 pass through the holes on the stiffening plate 7 to fix the cantilever beam to the first main structural beam 2. The specific connection method is as Figure 2 shown.

[0046] In this embodiment, the fasteners 10 used are M20 high-strength anchor bolts. Correspondingly, holes with a diameter of 21.5 mm are provided on the stiffening plate 7 to match the above-mentioned high-strength anchor bolts. It should be noted that in actual construction, other fasteners can also be used for connection. In order to further strengthen the connection, the flange of the above-mentioned cantilever beam and the stiffening plate are welded in a bevel groove manner.

[0047] Both ends of each edge-sealing beam 9 are fixed between the cantilever ends of two adjacent cantilever beams 1. The specific connection method is as Figure 3 shown. In this embodiment, both ends of the edge-sealing beam 9 are fixedly connected to the cantilever beam 1 by bolt connection, and M22 high-strength bolts can be used for the bolts.

[0048] As Figure 4 and Figure 5 shown, the cantilever steel platform structure part is an over-limit structure. To ensure the safety of the steel platform, tie rods and steel wires need to be arranged between the steel platform and the upper main structural beam. A double-layer ear plate 3 and a single-layer ear plate 4 are arranged on the cantilever end of the cantilever beam 1 from outside to inside. Correspondingly, a double-layer ear plate 3 is arranged on the second main structural beam 8, and a single-layer ear plate 4 is arranged on the third main structural beam 11. A tie rod 5 for ensuring the safety of the steel platform is arranged between the double-layer ear plates 3 on the cantilever end of the cantilever beam 1 and the second main structural beam 8. Holes are provided at both ends of the tie rod 5. The two ends of the tie rod respectively extend into the space between the double-layer ear plates 3 and are fixedly connected to the double-layer ear plates 3 by bolts. M22 high-strength bolts are used for the bolts, and the hole diameter of the double-layer ear plates is slightly larger than the hole diameter at both ends of the tie rod.

[0049] To further strengthen the stability of the steel platform, a steel wire rope 6 is arranged between the single-layer ear plate 4 on the cantilever end of the cantilever beam 1 and the third main structural beam 11. The two ends of the steel wire rope 6 respectively pass through the holes on the single-layer ear plate 4 and are fastened by wire clips. Through the most unfavorable safety calculation, in this embodiment, a Ф120×6 steel bar is used as the tie rod 5, and a Ф18 steel wire rope is used.

[0050] As Figure 6 shown, the formwork support system includes an end plate 13, a cushion block 15, a formwork 16 and a truss-type support 17.

[0051] Above the cantilever beam 1, formwork 16 for pouring the cast-in-place concrete floor slab 14 is laid. In this embodiment, the formwork used is plywood formwork. Holes for fixing the connecting piece 12 are opened on the web of the cantilever beam 1. The specific opening method is as Figure 7 shown. Two holes with a diameter of 14 mm are opened on the web of the cantilever beam 1, and the distance between the two holes is 88 mm.

[0052] The truss-type support 17 is arranged between two adjacent cantilever beams 1. End plates 13 are respectively fixed at both ends of the truss-type support 17. The connecting piece 12 passes through the holes on the web of the cantilever beam 1 and is fixedly connected to the end plate 13, so that the truss-type support 17 is arranged below the cantilever beam 1 to support the steel platform. A spacer 15 is also arranged at intervals between the formwork 16 and the truss-type support 17. In this embodiment, the spacer 15 is a square wood with a size of 80×60 mm.

[0053] This embodiment also provides a construction method for the above-mentioned cantilever steel structure construction platform with a formwork support system. The main steps are as follows: steel structure drawing deepening → steel component processing and arrival → operation platform erection → cantilever steel platform installation → tie rod and steel wire rope installation → truss-type support installation → formwork laying and reinforced concrete construction → tie rod and steel beam removal.

[0054] The first step: steel structure drawing deepening. Carry out deepening design on the steel platform, add a temporary steel structure platform at the outer edge of the original structure. The dimensions of the cantilever beam and the edge-sealing beam are 400×200×8×13 mm and 250×125×6×9 mm respectively, and determine the steel beam arrangement and structural dimensions.

[0055] The second step: steel component processing and arrival. Carry out steel structure processing and manufacturing according to the deepening design drawings, including steel beams, tie rods, stiffening plates, etc.; carry out acceptance procedures before the materials arrive at the site, and especially check and accept the dimensions and positions of the bolt holes.

[0056] The third step: operation scaffold erection. On the lower layer where the steel platform needs to be erected, erect a cantilevered external scaffold in the way of cantilevered I-beams, with three rows of vertical poles, and the width is greater than the upper steel platform, as the operation scaffold for the operation and demolition of the steel structure construction platform. At the same time, carry out hard isolation at the lower part to achieve the effect of safety protection.

[0057] The fourth step: cantilever steel platform installation. After the operation scaffold is erected, hoist the cantilever beam and the edge-sealing beam. After the hoisting is completed, first use temporary steel wire ropes for tying to do a good job in safety protection measures.

[0058] The cantilever beam is connected to the original structure through a stiffening plate. The stiffening plate is connected to the original structure by fillet welds. The cantilever beam is connected to the stiffening plate by bolt welding. The position of the flange and the stiffening plate is connected by groove welding.

[0059] A sealing steel beam is added to the end of the cantilever beam, and the edge-sealing beam and the cantilever beam are connected by bolts. Both ends of the edge-sealing beam 9 are fixedly connected to the cantilever beam 1 by bolt connection. M22 high-strength bolts can be used for the bolts. During the installation process, a total station and a spirit level are used to ensure the construction accuracy of the cantilever beam and the edge-sealing beam.

[0060] Step 5: Installation of tie rods and steel wires. Since part of the cantilever steel platform is an over-limit structure, to ensure the safety of the structure, through the most unfavorable safety calculation, it is necessary to use Ф120×6 steel bars, and use Ф18 steel wires to take stabilizing measures for the steel platform.

[0061] There is a tie rod 5 for ensuring the safety of the steel platform between the cantilever end of the cantilever beam 1 and the double-layer ear plates 3 on the second main structural beam 8. The two ends of the steel bar are provided with holes, and the two ends respectively extend between the double-layer ear plates 3 and are fixedly connected to the double-layer ear plates 3 by M22 high-strength bolts. There is a steel wire 6 between the cantilever end of the cantilever beam 1 and the single-layer ear plate 4 on the third main structural beam 11. The two ends of the steel wire 6 respectively pass through the holes on the single-layer ear plate 4 and are fastened by wire clips.

[0062] Step 6: Installation of truss-type supports. After the installation of the steel platform is completed, the formwork support system is started to be erected. In this embodiment, truss-type supports are used between the cantilever beams. Two holes with a diameter of 14 mm are opened on the web of the cantilever beam 1, and the distance between the two holes is 88 mm. The connecting piece is passed through the holes and fixed on the cantilever beam. A glued wood formwork for pouring the cast-in-place concrete floor slab 14 is laid above the cantilever beam 1. Both ends of the truss-type support 17 are provided with end plates 13, and the connecting piece 12 is fixedly connected to the end plate 13, so that the truss-type support 17 is arranged below the cantilever beam 1 to support the steel platform. A number of square timbers with a size of 80×60 mm are also arranged at intervals between the glued wood formwork and the truss-type support 17. A new formwork support system with a transparent upper and lower space is formed.

[0063] Step 7: Formwork laying and reinforced concrete construction. After the hoisting and elevation calibration are completed, the formwork laying and steel bar binding are started. After the on-site steel bars complete the supervision and acceptance work and obtain the pouring order, the concrete pouring is started, and regular maintenance is carried out after the pouring is completed.

[0064] Step 8: Removal of tie rods and steel beams. After the concrete curing reaches 100%, the tie rods, steel wires and steel beams are removed. The tie rod ear plates are buried in the concrete and removed by cutting. Using the lower operation frame, the cantilever steel beam and the edge-sealing steel beam are cut into sections and then transported indoors and transferred to the ground by the construction elevator and left the construction site.

[0065] The embodiments described above are only a preferred solution of the present invention, but they are not intended to limit the present invention. Those of ordinary skill in the relevant technical field can still make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A cantilever steel structure construction platform with a formwork support system, characterized in that, It includes a cantilever steel structure construction platform and a formwork support system; the cantilever steel structure construction platform includes an operation frame and a steel platform; The operation frame is arranged on the lower layer of the floor where the steel platform is located, and its width is greater than that of the upper steel platform; the steel platform includes several cantilever beams (1) and edge beams (9); the cantilever beams (1) are arranged at intervals in a horizontal posture, and one end of each cantilever beam (1) is vertically fixed to the first main structural beam (2) through several fasteners (10) arranged on the stiffening plate (7), and the other end of the cantilever beam (1) extends towards the direction away from the building where the first main structural beam (2) is located to form a cantilever end; The first main structural beam (2) is the main structural beam of the floor where the steel platform needs to be set, and the main structural beams on the first floor and the second floor above the first main structural beam (2) are the second main structural beam (8) and the third main structural beam (11) respectively; both ends of each edge beam (9) are fixed between the cantilever ends of two adjacent cantilever beams (1); Double-layer ear plates (3) and single-layer ear plates (4) are arranged from outside to inside on the cantilever end of the cantilever beam (1); double-layer ear plates (3) are provided on the second main structural beam (8), and single-layer ear plates (4) are provided on the third main structural beam (11); a tie rod (5) for ensuring the safety of the steel platform is arranged between the double-layer ear plates (3) on the cantilever end of the cantilever beam (1) and the second main structural beam (8); both ends of the tie rod (5) are fixedly connected by bolts between the double-layer ear plates (3); a steel wire rope (6) is arranged between the single-layer ear plate (4) on the cantilever end of the cantilever beam (1) and the third main structural beam (11); both ends of the steel wire rope (6) respectively pass through the holes on the single-layer ear plate (4) and are fastened by rope clamps; The formwork support system includes end plates (13), cushion blocks (15), formwork (16) and truss supports (17); formwork (16) for pouring the cast-in-place concrete floor slab (14) is laid above the cantilever beam (1); holes for fixing connectors (12) are opened on the web of the cantilever beam (1); the truss support (17) is arranged between two adjacent cantilever beams (1), and end plates (13) are respectively fixed at both ends of the truss support (17); the connector (12) passes through the holes on the web of the cantilever beam (1) and is fixedly connected with the end plate (13), so that the truss support (17) is arranged below the cantilever beam (1) to support the steel platform; cushion blocks (15) are also arranged at intervals between the formwork (16) and the truss support (17).

2. The cantilever steel structure construction platform with a formwork support system according to claim 1, wherein, The stiffening plate (7) is fixed to the first main structural beam by fillet welding.

3. The cantilever steel structure construction platform with a formwork support system according to claim 1, characterized in that, The fastener (10) is an anchor bolt.

4. The cantilever steel structure construction platform with a formwork support system according to claim 3, wherein The anchor bolt is an M20 high-strength anchor bolt.

5. The cantilever steel structure construction platform with a formwork support system according to claim 1, wherein, Both ends of the edge beam (9) are fixedly connected with the cantilever beam (1) by bolt connection.

6. The cantilever steel structure construction platform with a formwork support system according to claim 1 or 5, characterized in that, The bolt adopts an M22 high-strength bolt.

7. The cantilever steel structure construction platform with a formwork support system according to claim 1, characterized in that, Both the cantilever beam (1) and the edge beam (9) adopt steel beams. The cross-sectional size of the cantilever beam (1) is 400×200×8×13mm, and the cross-sectional size of the edge beam (9) is 250×125×6×9mm.

8. The cantilever steel structure construction platform with a formwork support system according to claim 1, characterized in that, The tie rod (5) adopts a Ф120×6 steel bar; the steel wire rope (6) adopts a Ф18 steel wire rope.

9. The cantilever steel structure construction platform with a formwork support system according to claim 1, characterized in that, The spacer block (15) is a square timber with dimensions of 80×60 mm; the formwork (16) is a glued laminated wood formwork.

10. A construction method for the construction platform according to any one of claims 1 to 9, characterized in that, Specifically as follows: S1: Set up an operating scaffold on the lower layer where the steel platform needs to be installed; the operating scaffold is set up as a cantilevered I-beam to form a single-layer cantilevered external scaffold, with three rows of vertical poles, and the width of the operating scaffold is greater than that of the upper-layer steel platform; S2: After the operating scaffold is set up, hoist the cantilever beam (1) and the edge-sealing beam (9); one end of the cantilever beam (1) is vertically fixed to the first main structural beam (2) through a number of fasteners (10) provided on the stiffening plate (7); a sealing beam (9) is added to the other end of the cantilever beam (1), and both ends of the sealing beam (9) are fixedly connected to the cantilever beam (1) by bolt connection. During the installation process, a total station and a spirit level are used to ensure the construction accuracy of the cantilever beam (1) and the edge-sealing beam (9), and the installation of the steel platform is completed; S3: A tie rod (5) is provided between the cantilever end of the cantilever beam (1) and the double-layer ear plates (3) on the second main structural beam (8); both ends of the tie rod (5) extend between the double-layer ear plates (3) and are fixedly connected by bolts; a steel wire rope (6) is provided between the cantilever end of the cantilever beam (1) and the single-layer ear plate (4) on the third main structural beam (11); both ends of the steel wire rope (6) pass through the holes on the single-layer ear plate (4) and are fastened by rope clamps; S4: After the installation of the steel platform is completed, a truss-type support is provided between two adjacent cantilever beams (1); holes are opened on the web of the cantilever beam (1), and the connecting piece (12) passes through the holes and is fixed on the cantilever beam (1); a formwork (16) for pouring the cast-in-place concrete floor slab (14) is laid above the cantilever beam (1); the end plates (13) at both ends of the truss-type support (17) are fixedly connected to the connecting piece (12) on the cantilever beam (1), so that the truss-type support (17) is arranged below the cantilever beam (1) to support the steel platform; a number of spacer blocks (15) are also arranged at intervals between the formwork (16) and the truss-type support (17) to form a formwork support system with a transparent upper and lower space; S6: After the formwork (16) is laid and the steel bars are tied, concrete is poured to form the cast-in-place concrete floor slab (14), and regular maintenance is carried out after the pouring is completed; S7: After the concrete maintenance is completed, the tie rod (5) and the steel wire rope (6) are removed; the cantilever beam (1) and the edge-sealing beam (9) are cut in sections using the lower operating scaffold and transported away from the construction site.

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