Integrated steel mould operation platform applied to open caisson construction

Abstract

The invention discloses an integrated steel formwork operation platform applied to open caisson construction. The integrated steel formwork operation platform comprises an outer formwork, an inner formwork, an outer operation platform, an inner operation platform and opposite-pull screws. The operation platform is integrated on the steel mold through bolt connection, the protective fences are arranged inside and outside the operation platform, and constructors stand on the operation platform to carry out operation such as inner and outer mold plate installation, steel bar binding and water-stop belt welding, so that the risk of safe operation is greatly reduced, and the construction efficiency is improved; the steel die assembly is fixedly connected with the well wall through split bolts, after a section of the open caisson wall is manufactured, maintenance is conducted till the designed strength is achieved, sinking is started, a lower die plate needs to be dismantled before sinking, the uppermost layer die plate is reserved to serve as a supporting point for later steel die installation, and after the steel die sinks to the preset height, the dismantled steel die is horizontally moved and installed to the position above the upper layer die plate. The lower section of well wall can be manufactured; repeated erection and disassembly of the scaffold in the construction process are avoided, the construction safety risk is reduced, and the construction period is shortened.

Description

Technical Field

[0001] The invention relates to a steel formwork device, in particular to an integrated steel formwork operation platform used for caisson construction, belonging to the technical field of infrastructure construction. Background Art

[0002] Caisson is a shaft-shaped structure. It is a construction method that digs soil from the shaft, relies on its own gravity to overcome the friction of the shaft wall and then sinks to the designed elevation. Then, it is sealed with concrete and the well hole is filled to make it the foundation of a bridge pier or other structure. It is generally used in the construction of foundation pits for large bridge piers, sewage pumping stations, large equipment foundations, civil air defense shelters, shield assembly wells, underground lanes and station hydraulic foundation construction enclosures. The construction process is usually assisted by a pile driver or a crane to gradually lower the shaft or building into the ground or water until the target depth, and then pour concrete to ensure the stability and safety of the building. Compared with traditional excavation methods, caisson construction has the advantages of short construction time, no dust, no noise, and little impact on the surrounding environment.

[0003] In the prior art, for example, a construction method for a cast-in-place caisson formwork system disclosed in publication number CN105672337A includes the following construction steps: excavation of foundation pit; laying of cushion layer; erection of scaffolding; support of the first section caisson formwork; pouring of concrete and maintenance; removal and sinking of the first section caisson formwork; support of the second section caisson formwork. The structure is easy to disassemble and assemble, with high construction efficiency, can realize cantilever formwork in the well and horizontal movement of formwork, can adapt to caisson formwork systems of different heights, and has good economic and technical benefits. However, the existing caisson construction adopts the construction form of "steel pipe scaffolding + wooden formwork". Since the scaffolding and the caisson cannot be consolidated, there is relative movement between the scaffolding and the caisson during the sinking process. As a result, in the construction process of "multiple production and segmented sinking" of the caisson, the steel pipe scaffolding needs to be repeatedly erected and dismantled. Therefore, a lot of time, manpower and material resources are consumed in the "scaffolding and formwork erection and dismantling links". In addition, during the construction process, personnel have to perform a large number of high-altitude edge operations, which has high safety risks and low construction efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide an integrated steel formwork working platform for caisson construction in order to solve at least one of the above-mentioned technical problems.

[0005] The present invention achieves the above object through the following technical solutions: An integrated steel formwork operation platform for open caisson construction, comprising a steel formwork assembly arranged in upper and lower layers. The steel formwork assembly includes an outer formwork and an inner formwork. The outer formwork is placed against the outer side of the open caisson wall to be poured, and the inner formwork is placed against the inner side of the open caisson wall to be poured. An outer operation platform is connected to the outer side wall of the outer formwork, and an inner operation platform is connected to the outer side wall of the inner formwork. The outer operation platform and the inner operation platform are respectively arranged corresponding to each layer of the formwork assembly. A plurality of tie rods are connected between the outer formwork and the inner formwork; The outer operation platform and the inner operation platform have the same structure. The outer operation platform includes a guardrail support and a platform support. The guardrail support is vertically welded to the outer end of the platform support. The inner end of the platform support is fixedly connected to the outer formwork. The platform supports are evenly distributed in a circular shape on the plate body of the outer formwork, and a support platform is horizontally placed on the platform supports.

[0006] As a further scheme of the present invention: Both the outer formwork and the inner formwork are integrated arc-shaped steel formworks. A plurality of transverse ribs and longitudinal ribs are arranged between each outer formwork and inner formwork, and adjacent outer formworks and adjacent inner formworks are fixedly connected by bolts.

[0007] As a further scheme of the present invention: A plurality of support steel plates are laid on the platform supports of the outer operation platform, and the support steel plates and the platform supports are fixedly connected by bolts. A passage guardrail is fixedly connected to the guardrail support of the outer operation platform by bolts.

[0008] As a further scheme of the present invention: Angle steel supports are fixedly connected between the platform supports and the outer formwork by bolts.

[0009] As a further scheme of the present invention: Platform docking parts are fixedly connected between the support platforms laid on the platform supports by bolts.

[0010] As a further scheme of the present invention: The rod body of the tie rod penetrates through the outer formwork and the inner formwork. Hoop rings are tied to the outer side surfaces of the outer formwork and the inner formwork away from the open caisson wall to be poured, and the butterfly buckle of the tie rod catches the hoop rings.

[0011] A construction method for an integrated steel formwork operation platform for open caisson construction, comprising an integrated steel formwork device. The construction method includes the following steps: S1. According to the construction drawings, complete the design of the integrated steel formwork using cad, perform a force analysis on the integrated steel formwork using software, and perform calculations to select appropriate steel plate thicknesses, angle steel cross-section sizes, tie rod sizes, and bolt sizes. Compile a special construction plan and organize experts to demonstrate the construction plan; Contact the steel formwork manufacturer to process the integrated steel formwork; Transport it to the construction site for pre-assembly of the steel formwork; S2. Excavation of the site foundation, pouring of cushion layer, laying of brick formwork for caisson blade foot, and assembly of integrated steel formwork for “blade foot”; S3. During the assembly of the above-mentioned integrated steel formwork, the binding of the shaft wall reinforcement and the welding of the construction joint water stop are completed simultaneously. The steel formwork, while serving as the shaft wall formwork, provides a work platform for the construction personnel to complete the concrete pouring of the "blade foot". During the concrete pouring process, the construction personnel stand on the fourth set of steel formwork integrated work platform to perform auxiliary pouring operations, maintain to the design strength, and assemble the "first section shaft wall" formwork; S4. During the assembly of the integrated steel formwork of the "first section of the well wall", the binding of the steel bars of the first section of the well wall and the welding of the construction joint water stop are completed simultaneously, and the concrete pouring of the "first section of the well wall" is completed. After two concrete pourings, the exposed caisson height has reached 7m, and the caisson is sunk for the first time at this time; S5. After sinking is completed, continue to repeat the above operations until the height of the cast well wall reaches 14m; the bottom sealing and top plate structure of the caisson are constructed.

[0012] As a further solution of the present invention: the assembled "blade foot" integrated steel mold body includes: S21. Multiple sets of steel molds were customized for this construction. Each steel mold was equipped with transverse and longitudinal ribs in the middle to increase the rigidity of the steel mold. S22. When the steel formwork is installed for the first time, it is directly placed on the concrete cushion layer. The outer steel formwork is connected by bolts, and the inner steel formwork is also connected by bolts. The inner and outer steel formworks are connected by tension screws. The butterfly buckles of the tension screws clamp the arc-shaped steel pipes of the inner and outer steel formworks, thereby reinforcing the inner and outer steel formworks. S23. The second set of steel molds are also connected to the first set of steel molds by bolts. After the second set of steel molds are assembled, the working platform of the second set of steel molds is set up. People can install and set up the working platform by standing on the ground. S24. Bolts are also used to connect the working platform and the inner and outer steel molds. First, install the inner and outer mold brackets, and then lay the inner and outer arc steel plate platform. After the platform is laid, install the safety guardrail between the inner and outer mold brackets. S25, continue to install the third set of steel formwork, the third set of steel formwork is still connected to the second set of steel formwork by bolts, and the personnel stand on the working platform that has just been set up and fixed to the second set of steel formwork to work. After assembling the third set of steel formwork, they also stand on the working platform of the second set of steel formwork to assemble the fourth set of steel formwork. After assembling the fourth set of steel formwork, continue to complete the setting up of the working platform and guardrail of the fourth set of steel formwork, and prepare for the construction of the next section of the shaft wall; S26. Assemble a box-type safety ladder. Personnel enter and exit the working platform using the box-type safety ladder.

[0013] As a further solution of the present invention, the assembly of the "first section of the shaft wall" template specifically includes: S31. Keep the top set of steel molds, remove the three sets of templates below, and install them horizontally above the fourth set of steel molds. The fourth set of steel molds is fixed to the well wall by tension bolts and serves as the force support point for the three sets of templates above. When personnel perform horizontal installation of the steel molds, they also stand on the integrated working platform of the fourth set of steel molds to perform the work; S32. Every 1-1.5m, the steel formwork is integrated with a working platform. The distance between adjacent upper and lower working platforms is 2-2.2m, which is convenient for construction workers to move around on the working platform.

[0014] The beneficial effects of the present invention are: 1) The integrated outer and inner formwork can be prefabricated in the factory with reserved holes, and then they can be connected and fixed by "electric wrench + bolts" during construction, which simplifies the production and installation process of traditional wooden formwork; 2) The working platform is integrated on the steel formwork through bolt connection. Guardrails are set inside and outside the working platform. Construction workers stand on the working platform to install internal and external formwork, tie steel bars, weld water stop strips, etc., which greatly reduces the risk of safe operation and improves construction efficiency; 3) The steel formwork assembly is fixed to the well wall by tension bolts. During the sinking process of the caisson, there is no relative movement between the steel formwork and the caisson, and the steel formwork does not need to be removed. After a section of the caisson wall is made and cured to the designed strength, sinking begins. Before sinking, the lower formwork needs to be removed, and the uppermost formwork is retained as the supporting point for the later installation of the steel formwork. When the steel formwork sinks to the predetermined height, the removed steel formwork is translated and installed above the upper formwork, and then the production of the lower section of the well wall can begin, avoiding repeated erection and dismantling of scaffolding during construction, reducing construction safety risks, and shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall top view structure of the present invention; Figure 2 It is a side view structural schematic diagram of the present invention; Figure 3 For the present invention Figure 1 Schematic diagram of the structure at A in the middle; Figure 4 It is a schematic diagram of the side structure of the external operating platform of the present invention; Figure 5 This is a structural schematic diagram of the supporting platform of the present invention in a docking state; Figure 6 This is a schematic diagram of the connection structure of the outer template, the inner template and the tension screw rod of the present invention; In the figure: 1. Outer formwork; 2. Inner formwork; 3. Outer operation platform; 31. Support steel plate; 32. Aisle guardrail; 33. Guardrail support; 34. Angle steel support; 35. Platform support; 36. Platform docking piece; 4. Inner operation platform; 5. Tie rod; 6. Support platform; 7. Hoop. Detailed implementation manners

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] Embodiment 1, as Figures 1 to 6 shown, an integrated steel formwork operation platform applied to caisson construction includes steel formwork components arranged in upper and lower layers. The steel formwork components include an outer formwork 1 and an inner formwork 2. The outer formwork 1 is placed against the outer side of the caisson wall to be poured, and the inner formwork 2 is placed against the inner side of the caisson wall to be poured. An outer operation platform 3 is connected to the outer side wall of the outer formwork 1, and an inner operation platform 4 is connected to the outer side wall of the inner formwork 2. The outer operation platform 3 and the inner operation platform 4 are respectively arranged corresponding to each layer of formwork components. A plurality of tie rods 5 are connected between the outer formwork 1 and the inner formwork 2. Through the tie rods 5, the outer formwork 1 and the inner formwork 2 can be respectively consolidated with the well wall, and the steel formwork components are arranged in layers. Furthermore, during the sinking process of the caisson, there is no relative movement between the steel formwork components and the caisson, and the steel formwork components do not need to be demolished. Only need to wait for the steel formwork components to sink to a predetermined height, retain the uppermost layer of steel formwork components, and translate and install the lower layer of steel formwork components to the upper layer. The outer operation platform 3 and the inner operation platform 4 have the same structure. The outer operation platform 3 includes a guardrail support 33 and a platform support 35. The guardrail support 33 is vertically welded to the outer end of the platform support 35. The inner end of the platform support 35 is fixedly connected to the outer formwork 1. The platform supports 35 are evenly distributed in a ring shape on the plate body of the outer formwork 1, and a support platform 6 is horizontally placed on the platform supports 35. By providing the outer operation platform 3 and the inner operation platform 4, it is convenient for construction workers to stand on the operation platform to perform operations such as installing inner and outer formworks, tying steel bars, and welding waterstops, greatly reducing the risk of safe operation and improving the construction efficiency. Moreover, both the outer operation platform 3 and the inner operation platform 4 can move and install their positions along with the translation construction of the steel formwork components, that is, avoiding the repeated erection and dismantling of the scaffolding during the construction process, reducing the construction safety risk, and shortening the construction period.

[0018] Example 2. In addition to all the technical features included in Example 1, this example further includes: both the outer formwork 1 and the inner formwork 2 are integrated arc-shaped steel formworks. Several transverse ribs and longitudinal ribs are arranged between each outer formwork 1 and the inner formwork 2 to improve the stiffness of the steel formwork. And adjacent outer formworks 1 and adjacent inner formworks 2 are fixedly connected by bolts, which is convenient for construction splicing and assembly to form an integral steel formwork assembly.

[0019] On the platform support 35 of the outer operation platform 3, several support steel plates 31 are laid, and the support steel plates 31 are fixedly connected to the platform support 35 by bolts. On the guardrail support 33 of the outer operation platform 3, a passage guardrail 32 is fixedly connected by bolts, so as to stably support the support platform 6 placed on the platform support 35 through the support steel plates 31, and the safety operation risk is greatly reduced by the provided passage guardrail 32, the construction efficiency is improved, and the bolt connection method is convenient for loading and unloading.

[0020] An angle steel support 34 is fixedly connected between the platform support 35 and the outer formwork 1 by bolts, so as to realize the stable connection between the platform support 35 and the outer formwork 1 through the angle steel support 34, and further ensure that the provided outer operation platform 3 can be stably connected to the outside of the outer formwork 1, so as to facilitate the assembly construction of the upper outer formwork 1 and the upper outer operation platform 3.

[0021] Platform connectors 36 are fixedly connected between the support platforms 6 laid on the platform support 35. The provided platform connectors 36 can make the support platforms 6 be stably laid on the platform support 35.

[0022] Furthermore, the rod body of the tie rod 5 penetrates through the outer formwork 1 and the inner formwork 2. Hoop rings 7 are tied to the outer sides of the outer formwork 1 and the inner formwork 2 away from the outer side of the well sinking wall to be poured. The butterfly buckle of the tie rod 5 catches the hoop rings 7, thereby strengthening the assembled structure of the outer formwork 1 and the inner formwork 2.

[0023] Example 3. A construction method of an integrated steel formwork operation platform applied to well sinking construction, including an integrated steel formwork device. This construction method includes the following steps: S1. According to the construction drawings, complete the design of the integrated steel formwork by using cad; perform stress analysis and calculation on the integrated steel formwork by using software, and select appropriate steel plate thickness, angle steel section size, tie rod size, and bolt size; compile a special construction plan and organize experts to demonstrate the construction plan; contact the steel formwork manufacturer to process the integrated steel formwork; deliver it to the construction site for pre-assembly of the steel formwork; S2. Lower the foundation of the site for excavation, pour the cushion layer, and build the brick formwork for the well sinking cutting edge; assemble the "cutting edge" integrated steel formwork. The inner diameter of the well sinking is 8m, the outer diameter is 10m, and the height is 15m. The plan is "fabricated four times and sunk three times"; S3. During the assembly of the above-mentioned integrated steel formwork, the binding of the shaft wall reinforcement and the welding of the construction joint water stop are completed simultaneously. The steel formwork not only serves as the shaft wall template, but also provides a work platform for construction personnel; the concrete pouring of the "blade foot" is completed. During the concrete pouring process, the construction personnel stand on the fourth set of steel formwork integrated work platform to perform auxiliary pouring operations, maintain to the design strength, and assemble the "first section shaft wall" template; S4. During the assembly of the integrated steel formwork of the "first section of the well wall", the binding of the steel bars of the first section of the well wall and the welding of the construction joint water stop are completed simultaneously, and the concrete pouring of the "first section of the well wall" is completed; after two concrete pourings, the exposed caisson height has reached 7m, and the caisson is sunk for the first time at this time; S5. After sinking is completed, continue to repeat the above operations until the height of the cast well wall reaches 14m; the bottom sealing and top plate structure of the caisson are constructed.

[0024] Further, the assembly of the "blade foot" integrated steel mold body includes: S21. A total of 4 sets of steel molds were customized for this construction. One set of steel molds can surround the well wall. It consists of 26 pieces of 1200*1000*3mm outer molds, 26 pieces of 960*1000*3mm inner molds, 26 pieces of angle steel outer mold brackets, 26 pieces of angle steel inner mold brackets, 26 pieces of outer arc steel plate platforms, 26 pieces of inner arc steel plate platforms, connecting bolts and tension screws; after the 4 sets of steel molds are assembled at one time, 4m of well wall can be cast at one time; 2 transverse ribs and 3 longitudinal ribs are added in the middle of each steel mold to improve the rigidity of the steel mold; S22. When the steel formwork is installed for the first time, it is directly placed on the concrete cushion layer. The outer steel formwork is connected by bolts, and the inner steel formwork is also connected by bolts. The inner and outer steel formworks are connected by tension screws. The butterfly buckles of the tension screws clamp the arc-shaped steel pipes of the inner and outer steel formworks, thereby reinforcing the inner and outer steel formworks. S23. The second set of steel molds are also connected to the first set of steel molds by bolts. After the second set of steel molds are assembled, the working platform of the second set of steel molds is set up. At this time, the working height is about 1.5-2m, and people can install and set up the working platform while standing on the ground. S24. Bolts are also used to connect the working platform and the inner and outer steel molds. First, install the inner and outer mold brackets, and then lay the inner and outer arc steel plate platform. After the platform is laid, install the safety guardrail between the inner and outer mold brackets. S25, continue to install the third set of steel molds. At this time, the working height is about 2.5-3m. The personnel cannot continue to stand on the ground to work. The third set of steel molds is still connected to the second set of steel molds by bolts. The personnel stand on the working platform that has just been set up and fixed to the second set of steel molds to work; after assembling the third set of steel molds, the fourth set of steel molds are also assembled on the working platform of the second set of steel molds. At this time, the personnel stand on the working platform, and the working height is about 1.5-2m; after assembling the fourth set of steel molds, continue to complete the erection of the working platform and guardrails of the fourth set of steel molds, and prepare for the next section of the shaft wall construction; S26. Assemble a box-type safety ladder. Personnel enter and exit the working platform using the box-type safety ladder.

[0025] Furthermore, the assembly of the "first section shaft wall" template specifically includes: S31. Keep the top set of steel molds, i.e., the fourth set of steel molds mentioned above, remove the three sets of templates below, and install them horizontally above the fourth set of steel molds. The fourth set of steel molds is fixed to the well wall by tension bolts, and serves as the force support point of the three sets of templates above. When personnel perform horizontal installation of the steel molds, they also stand on the integrated working platform of the fourth set of steel molds to perform the work; S32. Every 1-1.5m, the steel formwork is integrated with a working platform. The distance between adjacent upper and lower working platforms is 2-2.2m, which is convenient for construction workers to move around on the working platform.

[0026] Example 4: Taking the caisson constructed in the Wuhan Dengxi 220 kV power transmission and transformation project as an example, an integrated steel formwork operation platform used for caisson construction, the caisson (specifications are outer diameter 8-12m, wall thickness 800-1000mm, depth 12-17m) construction period is reduced from an average of 64d to about 42d, a decrease of about 35%, of which the proportion of "template and scaffolding erection and dismantling" in the total caisson construction time is reduced from 50% to 28%; The caisson construction period avoided high-risk operations such as "high-altitude operations" and "scaffolding erection and dismantling", and the number of violations dropped from an average of 13 times to 0.5 times, a decrease of more than 96%; The appearance quality of the caisson inside and outside has been significantly improved, and the roughness of the outer surface has been reduced by 90%; This project has a total of 4 caissons, all of which are made of "integrated steel formwork". The average construction cost (excluding main materials such as steel bars and concrete) is reduced from 65.16w / piece to 58.31w / piece, a decrease of about 10.5%; With the shortage of urban land, the advantages of comprehensive underground pipeline corridors, as the underground "artery" of urban power transmission, have gradually become prominent. Caisson, as an important "boosting pump" of the "artery", has broad application prospects in the construction of underground pipeline corridors due to its high product quality, short construction period, high safety, green environmental protection, and repeated use.

[0027] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0028] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An integrated steel formwork operation platform applied to open caisson construction, including steel formwork components arranged in upper and lower layers, and is characterized in that: The steel formwork assembly includes an outer formwork (1) and an inner formwork (2). The outer formwork (1) is placed against the outer side of the well sinking wall to be poured, and the inner formwork (2) is placed against the inner side of the well sinking wall to be poured. An outer operating platform (3) is connected to the outer side wall of the outer formwork (1), and an inner operating platform (4) is connected to the outer side wall of the inner formwork (2). The outer operating platform (3) and the inner operating platform (4) are each correspondingly arranged with each layer of formwork components. A number of tie bolts (5) are connected between the outer formwork (1) and the inner formwork (2); The outer operating platform (3) and the inner operating platform (4) have the same structure. The outer operating platform (3) includes a guardrail support (33) and a platform support (35). The guardrail support (33) is vertically welded to the outer end of the platform support (35). The inner end of the platform support (35) is fixedly connected to the outer formwork (1). The platform supports (35) are evenly distributed in a circular shape on the plate body of the outer formwork (1), and a support platform (6) is horizontally placed on the platform supports (35).

2. The integrated steel formwork operation platform according to claim 1, wherein: Both the outer formwork (1) and the inner formwork (2) are integral arc-shaped steel formworks. A number of transverse ribs and longitudinal ribs are provided in the middle of each outer formwork (1) and inner formwork (2), and adjacent outer formworks (1) and adjacent inner formworks (2) are fixedly connected by bolts.

3. The integrated steel formwork operation platform according to claim 1, characterized in that: A number of support steel plates (31) are laid on the platform supports (35) of the outer operating platform (3), and the support steel plates (31) are fixedly connected to the platform supports (35) by bolts. A passage guardrail (32) is fixedly connected to the guardrail support (33) of the outer operating platform (3) by bolts.

4. The integrated steel formwork operation platform according to claim 1, wherein: An angle steel support member (34) is fixedly connected between the platform support (35) and the outer formwork (1) by bolts.

5. The integrated steel formwork operation platform according to claim 1, characterized in that: Platform docking members (36) are fixedly connected between the support platforms (6) laid on the platform supports (35) by bolts.

6. The integrated steel formwork operation platform according to claim 1, characterized in that: The rod body of the tie bolt (5) penetrates through the outer formwork (1) and the inner formwork (2). Hoop rings (7) are tied to the outer side surfaces of the outer formwork (1) and the inner formwork (2) away from the well sinking wall to be poured, and the butterfly buckle of the tie bolt (5) catches the hoop rings (7).

7. A construction method of an integrated steel formwork operation platform for open caisson construction, including the integrated steel formwork operation platform according to any one of claims 1 to 6, characterized in that: The construction method includes the following steps: S1. According to the construction drawings, use cad to complete the design of the integral steel formwork, perform a stress analysis on the integral steel formwork using software, and perform calculations to select the steel plate thickness, angle steel cross-section size, tie bolt size, and bolt size. Compile a special construction plan, organize experts to demonstrate the construction plan, contact the steel formwork manufacturer to process the integral steel formwork; deliver it to the construction site for pre-assembly of the steel formwork; S2. Lower the foundation of the site for excavation, pour the cushion layer, build the brick formwork for the cutting edge of the well sinking, and assemble the "cutting edge" integral steel formwork; S3. During the assembly of the above-mentioned integrated steel formwork, the binding of the shaft wall reinforcement and the welding of the construction joint water stop are completed simultaneously. The steel formwork, while serving as the shaft wall template, provides a work platform for the construction personnel to complete the concrete pouring of the "blade foot". During the concrete pouring process, the construction personnel stand on the fourth set of steel formwork integrated work platform to perform auxiliary pouring operations, maintain to the design strength, and assemble the "first section shaft wall" template; S4. During the assembly of the integrated steel formwork of the "first section of the well wall", the binding of the steel bars of the first section of the well wall and the welding of the construction joint water stop are completed simultaneously, and the concrete pouring of the "first section of the well wall" is completed; after two concrete pourings, the exposed caisson height has reached 7m, and the caisson is sunk for the first time at this time; S5. After sinking is completed, continue to repeat the above operations until the height of the cast well wall reaches 14m; the bottom sealing and top plate structure of the caisson are constructed.

8. The construction method according to claim 7, characterized in that: In S2, assembling the "blade foot" integrated steel mold body includes: S21. This construction project customized several sets of steel molds; each steel mold has horizontal ribs and longitudinal ribs in the middle; S22. When the steel formwork is installed for the first time, it is directly placed on the concrete cushion layer. The outer steel formwork is connected by bolts, and the inner steel formwork is also connected by bolts. The inner and outer steel formworks are connected by tension screws. The butterfly buckles of the tension screws clamp the arc-shaped steel pipes of the inner and outer steel formworks, thereby reinforcing the inner and outer steel formworks. S23. The second set of steel molds are also connected to the first set of steel molds by bolts. After the second set of steel molds are assembled, the working platform of the second set of steel molds is set up. People can install and set up the working platform by standing on the ground. S24. Bolts are also used to connect the working platform and the inner and outer steel molds. First, install the inner and outer mold brackets, and then lay the inner and outer arc steel plate platform. After the platform is laid, install the safety guardrail between the inner and outer mold brackets. S25, continue to install the third set of steel formwork, the third set of steel formwork is still connected to the second set of steel formwork by bolts, and the personnel stand on the working platform that has just been set up and fixed to the second set of steel formwork to work; after assembling the third set of steel formwork, also stand on the working platform of the second set of steel formwork to assemble the fourth set of steel formwork; after assembling the fourth set of steel formwork, continue to complete the setting up of the working platform and guardrail of the fourth set of steel formwork, and prepare for the construction of the next section of the shaft wall; S26. Assemble a box-type safety ladder. Personnel enter and exit the working platform using the box-type safety ladder.

9. The construction method according to claim 7, characterized in that: In S3, the assembly of the "first section of the shaft wall" template specifically includes: S31. Keep the top set of steel molds, remove the three sets of templates below, and install them horizontally above the fourth set of steel molds. The fourth set of steel molds is fixed to the well wall by tension bolts and serves as the force support point for the three sets of templates above. When personnel perform horizontal installation of the steel molds, they also stand on the integrated working platform of the fourth set of steel molds to perform the work; S32. Every 1-1.5m, the steel formwork is integrated with a working platform. The distance between adjacent upper and lower working platforms is 2-2.2m, which is convenient for construction workers to move around on the working platform.

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