Operation platform in caisson and mounting method for shaft wall formwork

Abstract

The present invention relates to the technical field of construction of caissons. Disclosed are an operation platform in a caisson and a mounting method for a shaft wall formwork. The caisson platform consists of a platform base plate, a vertical rod assembly, a first horizontal support assembly and a second horizontal support assembly, wherein the rod assembly consists of a plurality of outer-ring vertical rods, a plurality of inner-ring vertical rods and central vertical rods; and the first horizontal support assembly and the second horizontal support assembly have the same structure, and each of the first horizontal support assembly and the second horizontal support assembly consists of a plurality of long diagonal support rods, a plurality of connecting rods and a plurality of short support rods. The present invention can provide supporting points for fixing inner formwork boards and, in combination with outer-ring reinforcing steel bars for outer formwork boards, can overcome impact force and lateral static pressure during concrete pouring, without needing to fix the formwork boards by using tie bolts. In addition, in a formwork assembly stage, the platform base plate can provide a working face for mounting the formwork. Thus, the present invention is convenient to operate, does not require assembly and disassembly, and can be directly hoisted and installed for use as a whole, thereby saving on time and labor.

Description

Installation method of operating platform and well wall template in caisson Technical Field

[0001] The invention relates to the technical field of caisson construction, and in particular to a method for installing an operating platform and a well wall template in a caisson. Background Art

[0002] Pipe jacking construction technology is a trenchless construction technology for laying pipelines without damaging the surface soil. Generally, two vertical shafts (working shaft and receiving shaft) are set up at both ends of the pipeline. Jacking equipment is installed in the working shaft, and the excavation and pipe lifting, pipe connection, measurement and other work are carried out. After the pipeline is penetrated, the jacking equipment is lifted out of the receiving shaft.

[0003] Caissons are a common maintenance structure used in pipe jacking construction, often used to construct deep working and receiving shafts. For cast-in-place reinforced concrete caissons, which are constructed in sections and lowered in stages, installing the inner formwork during the heightening process is a major challenge. This often requires a temporary work platform to facilitate access for personnel to perform operations such as steel bar tying, formwork installation, concrete pouring, and formwork removal, ensuring construction quality and safety.

[0004] At present, the platform production methods include setting up ground-type scaffolding, using pre-buried holes in the well wall to make a triangular support skeleton platform, using pre-buried parts in the well wall to support the assembled platform, and the overall movable platform. For example:

[0005] A Chinese patent discloses a scaffolding platform device for pipe jacking and caisson construction (publication number CN215331319U), which adopts the method of setting up a ground-type scaffolding;

[0006] A Chinese patent discloses a combined caisson wall platform structure and a caisson construction method (publication number CN113774941A). This patent utilizes pre-buried holes in the well wall to create a triangular support skeleton platform.

[0007] A Chinese patent discloses a multi-section circular caisson scaffolding assembly support platform (publication number CN209053410U), which uses embedded parts in the well wall to support the assembly platform.

[0008] A Chinese patent discloses an integral movable operating platform for caisson construction (publication number CN114457993B), which adopts the method of an integral movable platform.

[0009] However, the ground-type scaffolding method is often not suitable for the construction of internal platforms in deeper caissons because it needs to be dismantled and reinstalled every time the caisson is lowered and raised. In addition, the caisson bottom after excavation has complex geology, unstable foundation, and water accumulation.

[0010] Although the problem of the stability of the construction platform inside the caisson can be solved by making a triangular support skeleton platform using pre-buried holes in the well wall and supporting an assembled platform and an integral movable platform using pre-buried parts in the well wall, such platforms still have many on-site installation and disassembly procedures, which are time-consuming and labor-intensive, and are only suitable for situations where the inner and outer templates of the well wall are fixed with tension bolts. For this reason, the present invention provides a method for installing an operating platform and a well wall template in a caisson.

[0011] Summary of the Invention

[0012] In view of the deficiencies in the prior art, the present invention provides a method for installing an operating platform and a well wall template in a caisson, which solves the problems raised by the above-mentioned background technology.

[0013] To achieve the above objectives, the present invention is implemented through the following technical solutions: an operating platform in a caisson, the caisson platform is composed of a platform bottom plate, a vertical pole assembly, a first horizontal support assembly and a second horizontal support assembly;

[0014] The vertical pole assembly is fixed to the platform base plate by scaffolding fasteners and welding, and the vertical pole assembly consists of multiple outer ring vertical poles, inner ring vertical poles and a central vertical pole;

[0015] The first horizontal support assembly and the second horizontal support assembly have the same structure, and the first horizontal support assembly and the second horizontal support assembly are both fixed to the vertical pole assembly in two layers by scaffolding fasteners;

[0016] The first horizontal support assembly and the second horizontal support assembly are both composed of a plurality of long supporting rods, connecting rods and short supporting rods.

[0017] As a further technical solution of the present invention, the platform bottom plate includes a cladding steel pipe, a plurality of round steel pedals, a plurality of connecting steel pipes, a plurality of radiating steel pipes and a cross frame;

[0018] The plurality of radial steel pipes are formed by radiating from the center point of the cross frame to the end of the cross frame in an array;

[0019] The plurality of connecting steel pipes are distributed in a rectangular shape at the bottom of the radiating steel pipes and the cross frame with the center point of the cross frame as the center of the circle, and are fixed to the radiating steel pipes and the cross frame by scaffolding fasteners;

[0020] The edging steel pipe surrounds the radiating steel pipe and the upper end of the cross frame with the center point of the cross frame as the center of the circle.

[0021] As a further technical solution of the present invention, a plurality of the pedal round steels are arranged around the radial steel pipe and the upper end of the cross frame with the center point of the cross frame as the center of the circle and are located on the inner side of the edging steel pipe;

[0022] The innermost footrest round steel is located two-thirds of the way from the center point of the cross frame to the end, and the distance between each two footrest round steels is 10 cm.

[0023] As a further technical solution of the present invention, a plurality of outer ring uprights are distributed in a circular shape on the platform bottom plate and are located on the inner side of the footrest round steel closest to the center point of the platform bottom plate;

[0024] The plurality of inner circle vertical poles are distributed in a circular shape on the platform bottom plate and are located on the inner side of the plurality of inner circle vertical poles;

[0025] The two central upright poles are located in the middle of the platform bottom plate and are welded to the cross frame.

[0026] As a further technical solution of the present invention, the plurality of said supporting long rods are symmetrically and evenly distributed horizontally with the central vertical pole as the center, and are connected to the vertical pole assembly through scaffolding fasteners;

[0027] The plurality of connecting rods are distributed in a circular pattern with the central vertical rod as the center, and are connected to the outer ring vertical rods through scaffolding fasteners;

[0028] The plurality of short supporting rods are evenly distributed horizontally with the central vertical rod as the center, and are respectively connected to the supporting long rods and the connecting rods through scaffolding fasteners.

[0029] As a further technical solution of the present invention, one end of the supporting long rod and the supporting short rod are connected to an adjustable top support, one end of the top support is connected to an adjusting rod, and threaded holes are provided at one end of the supporting long rod and the supporting short rod corresponding to the adjusting rod. The top support is screwed into the threaded hole through the adjusting rod to be connected to the supporting long rod and the supporting short rod respectively.

[0030] As a further technical solution of the present invention, it also includes a plurality of outer templates and inner templates installed on the upper edge of the platform bottom plate, and the plurality of outer templates and the plurality of inner templates are connected by template fixing buckles to form an outer ring template and an inner ring template;

[0031] The outer side wall of the outer template is provided with a plurality of outer ring steel bars distributed at equal intervals from top to bottom, and the inner wall of the inner template is provided with two inner ring steel bars fixed from top to bottom.

[0032] As a further technical solution of the present invention, it also includes a plurality of external supports distributed at equal intervals outside the outer formwork, one end of the external support is also provided with a top support, and one end of the external support is buckled on the outer ring steel bar through the top support.

[0033] A method for installing a well wall template, the installation method comprises the following steps:

[0034] S1. Install the caisson platform in the caisson. The caisson platform is supported by pre-buried a circle of PVC pipe 30 cm from the upper edge of the caisson wall of the previous section. The pre-buried depth should be two-thirds of the thickness of the caisson wall. Then, threaded steel bars are inserted into the reserved holes to serve as the support for the caisson platform.

[0035] S2. The inner formwork is vertically buckled onto the supporting steel bars of the caisson platform. Then, the upper, middle, and lower parts of each two inner formworks are connected and fixed with formwork fixing buckles to form an inner ring formwork. After the fixing is completed, the two inner ring steel bars are divided into upper and lower layers and fixed to the upper and lower parts of the inner wall of the inner ring formwork respectively to fix the inner ring formwork. The inner ring steel bars and the outer ring steel bars are both threaded steel bars;

[0036] S3, then buckle the top supports connected to the first and second horizontal support assemblies on the platform bottom plate onto the inner ring formwork. The lengths of the top supports connected to the first and second horizontal support assemblies and the long supporting rods and short supporting rods are adjustable, facilitating telescopic adjustment to fix the inner ring formwork.

[0037] S4. Vertically buckle the plurality of outer formworks onto the supporting steel bars on the caisson platform, then connect and fix the upper, middle, and lower parts of each two outer formworks with formwork fixing buckles to form an outer ring formwork, and then respectively fix the three outer ring steel bars onto the upper, middle, and lower parts of the outer ring formwork to fix the outer ring formwork;

[0038] S5. Further, an external support is installed, wherein the top support at one end of the external support is buckled on the outer ring steel bar for fixing the outer ring formwork, and the external support is an inclined support, thereby realizing the installation of the well wall formwork. Beneficial effects

[0039] The present invention provides a method for installing an operating platform and a caisson wall template. Compared with the prior art, it has the following advantages:

[0040] 1. An operating platform in a caisson is an integral bottle-shaped structure. The entire platform is supported by inserting support rods into holes reserved in the previous section of the well wall. After the well wall construction is completed and the template is removed, the caisson platform can be hoisted out by crane equipment to save time for disassembly and assembly of the platform. When it is used again, it can be directly hoisted into place, saving time and effort, and solving the tedious problem of traditional ground-based scaffolding platforms that need to be disassembled and assembled every time they are used.

[0041] 2. An operating platform in a caisson, which can provide support points to fix the inner formwork through the cooperation of the first horizontal support assembly and the second horizontal support assembly inside the platform. Combined with the outer ring steel bars of the outer formwork, it can overcome the impact force and lateral static pressure during concrete pouring without the need to use tension bolts to fix the formwork. At the same time, during the formwork assembly stage, the platform bottom plate can provide a working surface for installing the formwork, which is not only easy to operate, but also does not require disassembly and assembly, and can be directly hoisted and used as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG1 is a schematic diagram of the disassembled structure of an operating platform and a well wall template in a caisson;

[0043] FIG2 is a schematic diagram of the installation structure of an operating platform and a well wall template in a caisson;

[0044] FIG3 is a schematic structural diagram of a platform bottom plate in an operating platform in a caisson;

[0045] FIG4 is a schematic structural diagram of a neutral pole assembly of an operating platform in a caisson;

[0046] FIG5 is a schematic diagram showing the connection between the neutral pole assembly and the platform bottom plate of the operating platform in the caisson;

[0047] FIG6 is a schematic structural diagram of a first horizontal support assembly in an operating platform in a caisson;

[0048] FIG7 is an enlarged schematic diagram of part A in FIG6 ;

[0049] FIG8 is a schematic structural diagram of the well wall template.

[0050] In the figure: 1, platform base plate; 11, edging steel pipe; 12, round steel for footrest; 13, connecting steel pipe; 14, radiating steel pipe; 15, cross frame;

[0051] 2. External support;

[0052] 3. Pole assembly; 31. Outer ring pole; 32. Inner ring pole; 33. Center pole;

[0053] 4. First horizontal support assembly; 41. Long supporting rod; 42. Connecting rod; 43. Short supporting rod; 411. Top support; 412. Adjusting rod;

[0054] 5. Second horizontal support assembly; 6. Outer formwork; 7. Inner formwork; 8. Outer ring steel bars; 9. Inner ring steel bars; 10. Formwork fixing buckle. DETAILED DESCRIPTION

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0056] As shown in Figures 1-8, the present invention provides a technical solution for installing an operating platform and a well wall template in a caisson:

[0057] An operating platform in a caisson, the platform comprising a platform base plate 1, a vertical pole assembly 3, a first horizontal support assembly 4, and a second horizontal support assembly 5. The vertical pole assembly 3 is fixed to the platform base plate 1 by means of scaffolding fasteners and welding. The first horizontal support assembly 4 and the second horizontal support assembly 5 have the same structure, and are both fixed to the vertical pole assembly 3 in two layers by means of scaffolding fasteners.

[0058] As shown in Figures 2 and 3, the platform base plate 1 includes a rimmed steel pipe 11, multiple round steel bars for footrests 12, multiple connecting steel pipes 13, multiple radiating steel pipes 14, and a cross frame 15. The multiple radiating steel pipes 14 are arranged radiatingly from the center point of the cross frame 15 to the ends of the cross frame 15 (as shown in Figure 3). Each cross frame 15 has multiple symmetrically distributed radiating steel pipes 14.

[0059] Multiple connecting steel pipes 13 are distributed in a rectangular shape at the bottom of the radiating steel pipes 14 and the cross frame 15 with the center point of the cross frame 15 as the center of the circle, and are fixed to the radiating steel pipes 14 and the cross frame 15 by scaffolding fasteners. The purpose of the connecting steel pipes 13 is to fix the multiple radiating steel pipes 14 and the cross frame 15 to ensure the stability of the circular platform base plate 1;

[0060] The edging steel pipe 11 is surrounded by the radial steel pipe 14 and the upper end of the cross frame 15 with the center point of the cross frame 15 as the center of the circle, and multiple footrest round steels 12 are surrounded by the radial steel pipe 14 and the upper end of the cross frame 15 with the center point of the cross frame 15 as the center of the circle and are located on the inner side of the edging steel pipe 11. The innermost footrest round steel 12 is away from the two-thirds of the center point to the end of the cross frame 15. The spacing between each two footrest round steels 12 is 10 cm, and the footrest round steels 12 are arranged between the two-thirds of the center of the platform bottom plate 1 (that is, the center point of the cross frame 15) radiating outward and the edging steel pipe 11. The purpose is to facilitate the protection of construction workers during operation. After the caisson platform is installed in the caisson, a fall prevention net can also be laid on the outer ring uprights 31.

[0061] As shown in Figures 4 and 5, the pole assembly 3 consists of multiple outer ring poles 31, inner ring poles 32 and center poles 33. The multiple outer ring poles 31 are distributed in a circular shape on the platform base plate 1 and are located on the inner side of a footrest round steel 12 closest to the center point of the platform base plate 1; the multiple inner ring poles 32 are distributed in a circular shape on the platform base plate 1 and are located on the inner side of the multiple inner ring poles 32; the two center poles 33 are located in the middle of the platform base plate 1 and are welded to the cross frame 15, wherein the outer ring poles 31 and the inner ring poles 32 are connected to the platform base plate 1 through scaffolding buckles (as shown in Figure 4), eight outer ring uprights 31 and eight inner ring uprights 32 are provided, of which four outer ring uprights 31 and four inner ring uprights 32 are inserted through the cross frame 15. The cross frame 15 is composed of two groups of steel pipes that are cross-shaped. Each group of steel pipes is welded by two pipes, and the two steel pipes are reserved with insertion holes to facilitate the insertion and fixation of the outer ring uprights 31 and the inner ring uprights 32. In addition, the positions of the inner ring uprights 32 and the outer ring uprights 31 are respectively at one-third and two-thirds of the platform bottom plate 1 (i.e., the center point of the cross frame 15) radiating outward from the edging steel pipe 11.

[0062] As shown in Figures 1, 2 and 6, the first horizontal support assembly 4 and the second horizontal support assembly 5 are both composed of a plurality of supporting long rods 41, connecting rods 42 and supporting short rods 43. The plurality of supporting long rods 41 are symmetrically and evenly distributed horizontally with the central vertical rod 33 as the center, and are connected to the vertical rod assembly 3 through scaffolding fasteners. The plurality of connecting rods 42 are distributed in a circular shape with the central vertical rod 33 as the center, and are connected to the outer ring vertical rods 31 through scaffolding fasteners; the plurality of supporting short rods 43 are evenly distributed horizontally with the central vertical rod 33 as the center, and are respectively connected to the supporting long rods 41 and the connecting rods 42 through scaffolding fasteners. The first horizontal support assembly 4 and the second horizontal support assembly 5 are distributed in two layers above the platform bottom plate 1, and the height position between the first horizontal support assembly 4 and the second horizontal support assembly 5 can be determined according to the height of each caisson section.

[0063] As shown in Figures 6 and 7, one end of the supporting long rod 41 and the supporting short rod 43 are connected to an adjustable top support 411, and one end of the top support 411 is connected to an adjusting rod 412. Threaded holes are provided at one end of the supporting long rod 41 and the supporting short rod 43 corresponding to the adjusting rod 412. The top support 411 is screwed into the threaded holes through the adjusting rod 412 to be connected to the supporting long rod 41 and the supporting short rod 43 respectively. The surface of the adjusting rod 412 is machined with an external thread, and its outer diameter is adapted to the inner diameter of the threaded hole. Therefore, by adjusting the length of the adjusting rod 412 screwed into the threaded hole, the length of the top support 411 at one end of the supporting long rod 41 and the supporting short rod 43 can be adjusted, which is convenient for adjusting the inner template 7 when supporting.

[0064] As shown in Figures 1, 2 and 8, it also includes a plurality of outer formworks 6 and inner formworks 7 installed on the upper edge of the platform base plate 1, and the plurality of outer formworks 6 and the plurality of inner formworks 7 are connected by formwork fixing buckles 10 to form outer ring formworks and inner ring formworks; the outer wall of the outer formwork 6 is evenly spaced from top to bottom with a plurality of outer ring steel bars 8, and there are three outer ring steel bars 8 in total; the inner wall of the inner formwork 7 is fixed with two inner ring steel bars 9 from top to bottom, and both the inner ring steel bars 9 and the outer ring steel bars 8 are threaded steel bars, and the outer formwork 6 and the inner formwork 7 are both steel formworks with a height of 1.5m and a width of 0.6m, and also include a plurality of outer supports 2 evenly spaced outside the outer formwork 6, and one end of the outer support 2 is also provided with a top support 411, and one end of the outer support 2 is buckled on the outer ring steel bar 8 through the top support 411.

[0065] A method for installing a well wall template, the installation method comprises the following steps:

[0066] S1. Before use, first fix the vertical pole assembly 3 on the platform base plate 1 in sequence, then fix the first horizontal support assembly 4 and the second horizontal support assembly 5 on the vertical pole assembly 3 in two layers using scaffolding fasteners, and the caisson platform can be assembled;

[0067] After the caisson platform is assembled, it is first hoisted directly into the caisson. Then, the caisson platform is supported in the caisson by pre-buried a circle of PVC pipe 30 cm from the upper edge of the caisson wall. The pre-buried depth should be two-thirds of the thickness of the well wall. Then, threaded steel bars are inserted into the reserved holes to serve as the support for the caisson platform.

[0068] S2. Further, the inner formwork 7 is vertically buckled on the supporting steel bars of the caisson platform, and then the upper, middle and lower parts of each two inner formworks 7 are connected and fixed with formwork fixing buckles 10 to form an inner ring formwork. After the fixing is completed, the two inner ring steel bars 9 are divided into two layers, upper and lower, and respectively fixed to the middle upper part and middle lower part of the inner wall of the inner ring formwork to fix the inner ring formwork;

[0069] S3, then buckle the top support 411 connected to the first horizontal support assembly 4 and the second horizontal support assembly 5 on the platform base plate 1 onto the inner ring template. The lengths between the top support 411 connected to the first horizontal support assembly 4 and the second horizontal support assembly 5 and the supporting long rod 41 and the supporting short rod 43 are adjustable, making it convenient to adjust the length to fix the inner ring template.

[0070] S4. Vertically buckle multiple outer formworks 6 onto the supporting steel bars on the caisson platform, then use formwork fixing buckles 10 to connect and fix the upper, middle, and lower parts of every two outer formworks 6 to form an outer ring formwork, and then fix three outer ring steel bars 8 to the upper, middle, and lower parts of the outer ring formwork respectively to fix the outer ring formwork;

[0071] S5. Further, the outer support 2 is installed. The top support 411 at one end of the outer support 2 is buckled on the outer ring steel bar 8 to fix the outer ring template. The outer support 2 is an inclined support, thereby realizing the installation of the well wall template.

[0072] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0073] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An operating platform in a caisson, characterized in that: The caisson platform is composed of a platform bottom plate (1), a vertical pole assembly (3), a first horizontal support assembly (4) and a second horizontal support assembly (5); The vertical pole assembly (3) is fixed on the platform bottom plate (1) by means of scaffolding fasteners and welding, and the vertical pole assembly (3) is composed of a plurality of outer ring vertical poles (31), inner ring vertical poles (32) and a central vertical pole (33); The first horizontal support assembly (4) and the second horizontal support assembly (5) have the same structure, and the first horizontal support assembly (4) and the second horizontal support assembly (5) are both fixed to the vertical pole assembly (3) in two layers by means of scaffold fasteners; The first horizontal support assembly (4) and the second horizontal support assembly (5) are both composed of a plurality of long supporting rods (41), connecting rods (42) and short supporting rods (43).

2. The operating platform in the caisson according to claim 1, characterized in that: The platform bottom plate (1) comprises a rimmed steel pipe (11), a plurality of round steel pedals (12), a plurality of connecting steel pipes (13), a plurality of radiating steel pipes (14) and a cross frame (15); A plurality of the radiation steel tubes (14) are formed by radiating from the center point of the cross frame (15) to the end of the cross frame (15) in an array; The plurality of connecting steel pipes (13) are distributed in a rectangular shape at the bottom of the radiating steel pipe (14) and the cross frame (15) with the center point of the cross frame (15) as the center of the circle, and are fixed to the radiating steel pipe (14) and the cross frame (15) by means of scaffolding fasteners; The edging steel pipe (11) surrounds the radiation steel pipe (14) and the upper end of the cross frame (15) with the center point of the cross frame (15) as the center of the circle.

3. The operating platform in the caisson according to claim 2, characterized in that: A plurality of the pedal round steels (12) are arranged around the upper ends of the radiation steel pipes (14) and the cross frame (15) with the center point of the cross frame (15) as the center of the circle and are located on the inner side of the edging steel pipe (11); The innermost footrest round steel (12) is located two-thirds of the distance from the center point to the end of the cross frame (15), and the distance between each two footrest round steels (12) is 10 cm.

4. The operating platform in the caisson according to claim 3, characterized in that: A plurality of outer ring uprights (31) are distributed in a circular shape on the platform bottom plate (1) and are located on the inner side of a footrest round steel (12) closest to the center point of the platform bottom plate (1); The plurality of inner ring uprights (32) are distributed in a circular shape on the platform bottom plate (1) and are located on the inner side of the plurality of inner ring uprights (32); The two central upright poles (33) are located in the middle of the platform bottom plate (1) and are welded to the cross frame (15).

5. The operating platform in a caisson according to claim 3, characterized in that: The plurality of supporting long rods (41) are symmetrically and evenly distributed horizontally with the central vertical rod (33) as the center, and are connected to the vertical rod assembly (3) through scaffolding fasteners; The plurality of connecting rods (42) are distributed in a circular shape with the central vertical rod (33) as the center, and are connected to the outer ring vertical rods (31) through scaffold fasteners; The plurality of supporting short rods (43) are evenly distributed horizontally with the central vertical rod (33) as the center, and are respectively connected to the supporting long rods (41) and the connecting rods (42) through scaffolding fasteners.

6. The operating platform in the caisson according to claim 5, characterized in that: One end of the supporting long rod (41) and the supporting short rod (43) are both connected to an adjustable top support (411), one end of the top support (411) is connected to an adjusting rod (412), and threaded holes are provided at one end of the supporting long rod (41) and the supporting short rod (43) corresponding to the adjusting rod (412), and the top support (411) is screwed into the threaded hole through the adjusting rod (412) to be connected to the supporting long rod (41) and the supporting short rod (43) respectively.

7. The method for installing an operating platform and a well wall template in a caisson according to claim 1, characterized in that: It also includes a plurality of outer templates (6) and inner templates (7) installed on the upper edge of the platform bottom plate (1), wherein the plurality of outer templates (6) and the plurality of inner templates (7) are connected by template fixing buckles (10) to form an outer circle template and an inner circle template; The outer wall of the outer template (6) is provided with a plurality of outer ring steel bars (8) distributed at equal intervals from top to bottom, and the inner wall of the inner template (7) is provided with two inner ring steel bars (9) fixed from top to bottom.

8. The method for installing an operating platform and a well wall template in a caisson according to claim 7, characterized in that: It also includes a plurality of outer supports (2) which are evenly spaced and located outside the outer formwork (6), one end of each outer support (2) is also provided with a top support (411), and one end of each outer support (2) is buckled onto the outer ring steel bar (8) through the top support (411).

9. A method for installing a well wall template, characterized in that: The operating platform in the caisson according to any one of claims 1 to 8 is installed by the following steps: S1. Install the caisson platform in the caisson. The supporting part of the caisson platform in the caisson is to embed a circle of PVC pipe 30 cm away from the upper edge of the wall of the previous section of the caisson. The embedding depth should be two-thirds of the thickness of the wall. Then, threaded steel bars are inserted into the reserved holes as the supporting parts of the caisson platform. S2, the inner template (7) is vertically buckled onto the supporting steel bars of the caisson platform, and then the upper, middle and lower parts between each two inner templates (7) are connected and fixed by template fixing buckles (10) to form an inner ring template. After the fixing is completed, the two inner ring steel bars (9) are divided into upper and lower layers and respectively fixed to the middle upper part and middle lower part of the inner wall of the inner ring template to fix the inner ring template, wherein the inner ring steel bars (9) and the outer ring steel bars (8) are both threaded steel bars; S3, then the top support (411) connected to the first horizontal support assembly (4) and the second horizontal support assembly (5) on the platform bottom plate (1) is buckled onto the inner circle template, and the length between the top support (411) connected to the first horizontal support assembly (4) and the second horizontal support assembly (5) and the supporting long rod (41) and the supporting short rod (43) can be adjusted, so as to facilitate telescopic adjustment to fix the inner circle template; S4, vertically buckle the plurality of outer templates (6) on the supporting steel bars on the caisson platform, then connect and fix the upper, middle and lower parts of each two outer templates (6) with template fixing buckles (10) to form an outer ring template, and then respectively fix the three outer ring steel bars (8) on the upper, middle and lower parts of the outer ring template to fix the outer ring template; S5. Further, an outer support (2) is installed, wherein a top support (411) at one end of the outer support (2) is buckled onto the outer ring steel bar (8) for fixing the outer ring formwork, and the outer support (2) is an inclined support, thereby realizing the installation of the well wall formwork.

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