Recyclable combined steel structure caisson and construction method thereof

Abstract

The present application relates to steel structure sinking well technical field, specifically be a kind of recyclable combined steel structure sinking well and its construction method, including four two two symmetrical steel angle column and four pieces of well wall, well wall is installed between adjacent two steel angle column, four steel angle column and four pieces of well wall combination installation form steel structure sinking well, the present application adopts the concept of combination assembly, steel structure sinking well component is made in factory processing, ground assembly forms rigid structure at construction site, according to conventional sinking well construction technology, sinking well is sunk in place, after completing the trenchless construction of pipeline, in the sinking well inside backfilling earthwork removes the connecting piece of steel sinking well well wall, finally on the ground, steel component is pulled out and recycled, so as to ensure that the influence on surrounding environment during construction process is minimum, risk is minimum, and enclosure structure and permanent structure are combined into one, and it is good in economy, high in quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure sinking well, in particular to a recyclable combined steel structure sinking well and a construction method thereof. BACKGROUND

[0002] Underground pipelines (sewage pipes, power mains, etc.) constructed by trenchless methods (pipe jacking, pipe pulling, etc.) must have working wells. Traditionally, a reinforced concrete sinking well is provided every 100 m or so along the pipeline, the net space in the reinforced concrete sinking well is 3.5 m*6.0 m (or slightly larger), and the well depth is basically more than 6 m.

[0003] The reinforced concrete sinking well has the following disadvantages:

[0004] 1. Non-reusable. The reinforced concrete sinking well only plays a role in the process of pipeline jacking (temporary working condition), and after the pipeline jacking is completed, the reinforced concrete sinking well can only be used as a manhole (permanent working condition) for personnel to maintain the pipeline. Compared with the traditional manhole, the use of the temporary sinking well as the permanent manhole causes a large amount of waste of reinforced concrete resources.

[0005] 2. Difficult to control the sinking process. Once the reinforced concrete sinking well is poured, the weight is basically stable, while the resistance in the sinking process is variable, so it is difficult to control the sinking stability.

[0006] 3. High cost and long construction period. The reinforced concrete sinking well is generally constructed in layers and sunk in sections. After the concrete is poured, it needs to wait for the sinking well to reach the design strength, which leads to a long construction period of the reinforced concrete sinking well and a long time of affecting the road or surrounding environment. Therefore, a recyclable combined steel structure sinking well and a construction method thereof are provided to solve the above problems. SUMMARY

[0007] The present application aims to provide a recyclable combined steel structure sinking well and a construction method thereof to solve the above technical problems.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a recyclable combined steel structure sinking well, comprising four steel angle columns arranged in pairs of symmetry and four well walls, the well walls are installed between adjacent two steel angle columns, and the four steel angle columns and the four well walls are combined and installed to form a steel structure sinking well.

[0009] The steel angle column has a square cross-sectional shape, and an angle steel is welded at the joint between the steel angle column and the well wall.

[0010] Four pieces of the shaft wall comprise a plurality of H-shaped steels, a plurality of A-shaped steel plate assemblies and at least one set of combined steel plate pieces with holes, each of the A-shaped steel plate assemblies comprises two A-shaped steel plates, the combined steel plate pieces comprise two combined steel plates, the plurality of H-shaped steels are arranged between two adjacent steel angle columns, the angle steels are connected with the flanges of the adjacent H-shaped steels, and the flanges at the two ends of the adjacent H-shaped steels are connected by the A-shaped steel plate assemblies or the combined steel plate pieces, respectively.

[0011] Preferably, the steel blade feet are further included, the bottom of the steel blade feet is in a wedge shape, the steel blade feet are hollow inside and are provided with openings at the top, tie steel plates are arranged between the side walls of the cavities of the steel blade feet, and the steel angle columns and the H-shaped steels are inserted into the cavities of the steel blade feet and are located at the upper portions of the tie steel plates.

[0012] Preferably, the steel ring beams are further included, the steel ring beams are in a rectangular shape, and the steel ring beams are sleeved on the steel angle columns and the top of the shaft wall.

[0013] Preferably, the H-shaped steels and the angle steels, the H-shaped steels and the A-shaped steel plate assemblies, and the H-shaped steels and the combined steel plates are connected by a plurality of bolt assemblies.

[0014] The bolt assembly comprises two nuts and a steel screw rod.

[0015] The two nuts are welded on the side faces of the angle steels away from each other, and the steel screw rod passes through the angle steels and the H-shaped steels and is connected with the nuts.

[0016] The two nuts are welded on the side faces of the two A-shaped steel plates away from each other, and the steel screw rod passes through the H-shaped steel and the inner and outer A-shaped steel plates and is connected with the nuts.

[0017] The two nuts are welded on the side faces of the two combined steel plates away from each other, and the steel screw rod passes through the H-shaped steel and the inner and outer combined steel plates and is connected with the nuts.

[0018] Preferably, the combined steel plate comprises a first B-shaped steel plate, two C-shaped steel plates and a second B-shaped steel plate, the two C-shaped steel plates are provided with semicircular holes matched with each other, the combined steel plate is installed in sequence from top to bottom as the first B-shaped steel plate, the two C-shaped steel plates and the second B-shaped steel plate, and the semicircular holes of the two C-shaped steel plates are oppositely arranged to form a circular hole.

[0019] A construction method of a recyclable combined steel structure open caisson, the construction method comprises the following steps:

[0020] S1: welding the steel blade feet into a whole at the position of the shaft body, and then filling sand and stone in the cavities of the steel blade feet;

[0021] S2: the steel angle column and the H-shaped steel are inserted into the steel blade foot respectively, and then the A-shaped steel plate, the first B-shaped steel plate, the C-shaped steel plate and the second steel plate are bolted with the steel angle column and the H-shaped steel respectively by using steel bolts to form a shaft wall;

[0022] S3: the segmented steel ring beam is buckled on the steel angle column and the shaft wall, and is bolted to form an integral steel ring beam;

[0023] S4: the sinking well operation is performed by using mechanical equipment to dig soil to the bottom surface of the bottom sealing concrete;

[0024] S5: the bottom sealing concrete is poured, and the reinforced concrete bottom plate is poured;

[0025] S6: the pipe jacking, pipe pulling and other trenchless pipeline construction operations are performed on the reinforced concrete bottom plate;

[0026] S7: after the pipeline construction operation is completed, the construction machinery in the well is removed, the earthwork in the well is backfilled, and the steel bolts are removed from bottom to top along with the earthwork backfilling;

[0027] S8: after the earthwork backfilling approaches the ground, the steel ring beam is removed, the A-shaped steel plate, the first B-shaped steel plate, the C-shaped steel plate above the hole and the H-shaped steel are pulled out, and then the steel angle column is pulled out to complete the removal.

[0028] Preferably, before the steel foot blade is welded in the step S1, the position of the well body is leveled, and the underground obstacles at the steel blade foot of the sinking well are cleaned.

[0029] Preferably, the step S5 can also be that the steel plate is directly placed on the bottom sealing concrete to form a steel bottom plate.

[0030] Preferably, the sinking well operation in the step S4 can be performed in a drainage sinking or non-drainage sinking mode according to the specific geological conditions of the site.

[0031] Preferably, the step S7 further includes building an inspection well required by the water conservancy profession.

[0032] Compared with the prior art, the beneficial effects of the present application are:

[0033] The present application adopts the concept of combined assembly, the steel structure sinking well components are manufactured and processed in the factory, the ground is assembled to form a rigid structure at the construction site, the sinking well is sunk to the position according to the conventional sinking well construction technology, after the trenchless construction of the pipeline is completed, the connecting pieces of the steel sinking well wall are removed while backfilling the earthwork in the sinking well, and finally the steel components are pulled out and recycled on the ground, so that the influence on the surrounding environment during the construction process is minimized, the risk is minimized, the enclosure structure and the permanent structure are combined, the economic efficiency is good, and the quality is high. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on these drawings.

[0035] Figure 1 is a schematic diagram of a plane structure of the present application;

[0036] Figure 2 is a schematic diagram of a partial structure of the present application; Figure 1

[0037] Figure 3 is a schematic diagram of a well wall structure provided with a through hole in the present application;

[0038] Figure 4 is a schematic diagram of a well wall split component in the present application;

[0039] Figure 5 is a schematic diagram of a structure of a steel angle column in the present application;

[0040] Figure 6 is a schematic diagram of a structure after a corbel beam is inserted into a steel angle column or a well wall in the present application;

[0041] Figure 7 is a schematic diagram of a structure after a steel angle column or a well wall is inserted into a steel blade foot in the present application;

[0042] Figure 8 is a flow chart of a construction method of the present application.

[0043] In the drawings, the components represented by each reference numeral are listed as follows:

[0044] 1, steel angle column; 11, angle steel; 2, well wall; 21, H-shaped steel; 22, A-shaped steel plate; 23, combined steel plate; 231, first B-shaped steel plate; 232, C-shaped steel plate; 233, second B-shaped steel plate; 3, steel blade foot; 31, tie-in steel plate; 4, steel ring beam; 5, bolt assembly; 51, nut; 52, steel screw rod. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0046] Please refer to Figures 1-8 ​The application provides a technical scheme: a recyclable combined steel structure caisson, which comprises four steel angle columns 1 arranged in pairs of symmetry and four caisson walls 2, the caisson walls 2 are installed between the adjacent two steel angle columns 1, and the four steel angle columns 1 and the four caisson walls 2 are combined and installed to form a steel structure caisson;

[0047] The steel angle column 1 is square in cross section shape, and an angle steel 11 is welded at the joint of the steel angle column 1 and the caisson wall 2;

[0048] The four caisson walls 2 comprise a plurality of H-shaped steels 21, a plurality of A-shaped steel plate assemblies and at least one combined steel plate piece with a through hole, each A-shaped steel plate assembly comprises two A-shaped steel plates 22, the combined steel plate piece comprises two combined steel plates 23, the plurality of H-shaped steels 21 are arranged between the adjacent two steel angle columns 1, the angle steel 11 is connected with the flanges of the adjacent H-shaped steels 21, and the flanges at the two ends of the adjacent two H-shaped steels 21 are connected through the A-shaped steel plate assembly or the combined steel plate piece respectively.

[0049] Specifically, the steel blade feet 3 are further included, the bottom of the steel blade feet 3 is wedge-shaped, the steel blade feet 3 are hollow inside and are provided with openings at the top, tie-in steel plates 31 are arranged between the side walls in the cavities of the steel blade feet 3, and the steel angle columns 1 and the H-shaped steels 21 are inserted into the cavities of the steel blade feet 3 and located at the upper portions of the tie-in steel plates 31.

[0050] Specifically, the steel ring beams 4 are further included, the steel ring beams 4 are rectangular in shape, and the steel ring beams 4 are sleeved at the top portions of the steel angle columns 1 and the caisson walls 2.

[0051] Specifically, the H-shaped steels 21, the angle steels 11, the H-shaped steels 21 and the A-shaped steel plate assemblies, and the H-shaped steels 21 and the combined steel plates 23 are all fixed through a plurality of bolt assemblies 5;

[0052] The bolt assembly 5 comprises two nuts 51 and a steel screw rod 52;

[0053] The two nuts 51 are welded on the side faces of the angle steels 11 away from each other, and the steel screw rod 52 passes through the angle steels 11 and the H-shaped steels 21 and is bolted with the nuts 51;

[0054] The two nuts 51 are welded on the side faces of the two A-shaped steel plates 22 away from each other, and the steel screw rod 52 passes through the H-shaped steels 21 and the inner and outer A-shaped steel plates 22 and is bolted with the nuts 51;

[0055] The two nuts 51 are welded on the side faces of the two combined steel plates 23 away from each other, and the steel screw rod 52 passes through the H-shaped steels 21 and the inner and outer combined steel plates 23 and is bolted with the nuts.

[0056] Specifically, the combined steel plate 23 includes a first B-type steel plate 231, two C-type steel plates 232, and a second B-type steel plate 233, the two C-type steel plates 232 are both provided with semicircular holes matched with each other, and the combined steel plate 23 is installed in sequence from top to bottom as the first B-type steel plate 231, the two C-type steel plates 232, and the second B-type steel plate 233, and the semicircular holes of the two C-type steel plates 232 are oppositely arranged to form a circular hole.

[0057] A construction method of a recyclable combined steel structure open caisson, the construction method comprising the following steps:

[0058] S1: welding the steel blade foot 3 into a whole at the position of the well body, and then filling sand and stone in the cavity of the steel blade foot 3;

[0059] S2: inserting the steel angle column 1 and the H-shaped steel 21 into the steel blade foot 3, respectively, and then connecting the A-type steel plate 22, the first B-type steel plate 231, the C-type steel plate 232, and the second steel plate 233 with the steel angle column 1 and the H-shaped steel 21 by using steel bolts 52 to form a well wall 2;

[0060] S3: buckling the segmented steel ring beam 4 on the steel angle column 1 and the well wall 2, and connecting them into a whole steel ring beam;

[0061] S4: open caisson operation, using mechanical equipment to dig soil to the bottom surface of the bottom sealing concrete;

[0062] S5: pouring the bottom sealing concrete and pouring the reinforced concrete bottom plate;

[0063] S6: carrying out trenchless pipeline construction operation such as pipe jacking and pipe pulling on the reinforced concrete bottom plate;

[0064] S7: after the pipeline construction operation is completed, removing the construction machinery in the well, backfilling the earthwork in the well, and removing the steel bolts from bottom to top along with the earthwork backfilling;

[0065] S8: after the earthwork backfilling approaches the ground, removing the steel ring beam 4, pulling out the A-type steel plate 22, the first B-type steel plate 231, the C-type steel plate 232 above the hole, and the H-shaped steel 21, and then pulling out the steel angle column 1 to complete the removal.

[0066] Specifically, before welding the steel blade foot 3 in step S1, first level the floor at the position of the well body, and clean the underground obstacles at the steel blade foot 3 of the open caisson.

[0067] Specifically, step S5 can also be: directly placing the steel plate on the bottom sealing concrete to make a steel bottom plate.

[0068] Specifically, the open caisson operation in step S4 can use the drainage sinking or non-drainage sinking method according to the specific geological conditions of the site.

[0069] Specifically, step S7 further includes: building a check well required by the water conservancy profession.

[0070] Embodiment:

[0071] 1) According to the design requirements, the steel components are processed in the factory, including segmented steel blade feet 3, segmented steel ring beams 4, steel angle columns 1, A-shaped steel plates 22, first B-shaped steel plates 231, C-shaped steel plates 232, second B-shaped steel plates 233, and H-shaped steel 21, and the processed steel components are transported to the construction site. When the steel components are processed, the width of the A-shaped steel plate 22 is 100 mm as the modulus, and the height is 300 mm as the modulus; the radius of the arc of the C-shaped steel plate 232 meets the outer radius of the required construction pipeline plus 100 mm, and the arc to the upper edge and the two side edges of the plate is not greater than 200 mm, and the length and width of the C-shaped steel plate are 100 mm as the modulus; the width of the first B-shaped steel plate 231 and the second B-shaped steel plate 233 is the same as that of the C-shaped steel plate 232, and the height is 100 mm as the modulus; the thickness of each plate is consistent, 2 mm as the modulus and not less than 8 mm; the cross-sectional height of the H-shaped steel 21 is 100 mm as the modulus and not less than 500 mm, and the height of the H-shaped steel 21 is 300 mm as the modulus; the cross-sectional height of the H-shaped steel 21 is the same as the cross-sectional height of the steel angle column 1, and the height of the H-shaped steel 21 is the same as the height of the steel angle column 1; the top elevation of the steel caisson is controlled to be close to the ground elevation or slightly higher than the ground elevation. The H-shaped steel and the steel angle column in the well wall have the same height, the top elevation of the A-shaped and B-shaped steel plates bolted on the H-shaped steel is the same as the lower end elevation of the steel plate on the two sides of the steel ring beam, and the top elevation of the H-shaped steel and the steel angle column is the same as the bottom elevation of the lower steel plate of the steel ring beam;

[0072] Taking a conventional plane size of 3.5m*6.0m as an example, the length of the long side well wall without opening is 6.0m, and the length of the short side well wall with opening is 3.5m. For the long side well wall, the H-shaped steel 21 is uniformly arranged to configure the A-shaped steel plate 22; for the short side well wall, the outer diameter of the required construction pipeline is increased by 200mm to control the circular hole size of the C-shaped steel plate 232, and not less than one H-shaped steel 21 is arranged on both sides of the circular hole to configure the A-shaped steel plate 22, and the width of the A-shaped steel plate 22 and the C-shaped steel plate 232 is preferably coordinated and meets the above modulus.

[0073] 2) Level the position of the well body and clean the underground obstacles at the steel blade feet 3;

[0074] 3) Weld the segmented steel blade feet 3 transported from the factory into a whole at the well body position, and fill sand and stone in the cavity of the steel blade feet 3;

[0075] 4) Steel angle column 1 and H-shaped steel 21 are inserted into steel blade foot 3, first, angle steel 11 of steel angle column 1 is bolted with adjacent H-shaped steel 21 by steel screw rod 52, then A-shaped steel plate 22, first B-shaped steel plate 231 (if necessary), C-shaped steel plate 232 (if necessary) and second B-shaped steel plate 233 (if necessary) are bolted with adjacent two groups of H-shaped steel 21 by steel screw rod 52 respectively, to form shaft wall 2 (angle steel 11 of steel angle column 1 can also be directly bolted with A-shaped steel plate 22);

[0076] 5) According to the need of sinking construction, part or all of the steel caisson shaft wall cavity is filled with sand, stone or water; brick is placed in the circular hole enclosed by the C-shaped steel plate 232;

[0077] 6) The segmented steel ring beam 4 is buckled on the steel angle column 1 and the shaft wall 2, and then bolted into an integral steel ring beam;

[0078] 7) Caisson operation, excavate soil by mechanical equipment to the bottom surface of the bottom sealing concrete. The caisson operation can be carried out by drainage sinking and non-drainage sinking according to the specific geological conditions of the site, and the depth of the steel caisson into the soil is matched with the elevation of the pipeline to be constructed according to the position of the C-shaped steel plate 232; if pipeline construction is required in both directions of the caisson, the depth of the caisson into the soil is controlled according to the elevation of the pipeline with the deepest burial depth;

[0079] 8) Pouring bottom sealing concrete, which can be reinforced concrete bottom plate according to the need, or steel plate is directly placed on the bottom sealing concrete to make a steel bottom plate;

[0080] 9) Non-excavation pipeline construction such as pipe jacking and pipe pulling is carried out on the reinforced concrete bottom plate (or steel bottom plate) ;

[0081] 10) After the pipeline construction is completed, the construction machinery in the well and the steel bottom plate (if any) are removed, the soil in the well is backfilled, and if necessary, the inspection well required by the water conservancy professional is constructed; the steel screw rod 52 is removed from bottom to top during the soil backfilling;

[0082] 11) After the soil backfilling approaches the ground, the steel ring beam 4 is removed, the A-shaped steel plate 22, the first B-shaped steel plate 231, the C-shaped steel plate 232 above the hole and the H-shaped steel 21 inside and outside the shaft wall 2 are pulled out by mechanical equipment, and then the steel angle column 1 is pulled out, and the construction is completed.

[0083] The present application adopts the concept of combined assembly, the steel structure caisson components are manufactured and processed in the factory, the ground is assembled into a rigid structure at the construction site, the caisson is sunk to the position according to the conventional caisson construction technology, after the non-excavation construction of the pipeline is completed, the connecting members of the steel caisson shaft wall are removed while the soil is backfilled in the caisson, and finally the steel components are pulled out and recycled on the ground, so that the influence on the surrounding environment during the construction process is minimized, the risk is minimized, the enclosure structure and the permanent structure are combined, the economy is good, and the quality is high.

[0084] Any of the technical solutions disclosed in the present application, if it discloses a numerical range, the disclosed numerical range is a preferred numerical range, any person skilled in the art should understand that the preferred numerical range is only one of the many implementable numerical values with more obvious technical effects or representative. Because there are too many values to enumerate, the present application discloses some values to illustrate the technical solutions of the present application, and the above-mentioned enumerated values should not constitute a limitation on the protection scope of the present application.

[0085] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screwing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited, the above-mentioned terms in the present application can be understood according to the specific meaning of the above-mentioned terms in the present application by the person skilled in the art.

[0086] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that modifications can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A recyclable, modular steel structure caisson, characterized in that: It includes four steel corner columns (1) arranged symmetrically in pairs and four well walls (2). The well walls (2) are installed between two adjacent steel corner columns (1). The four steel corner columns (1) and the four well walls (2) are combined and installed to form a steel structure caisson. The steel corner post (1) has a square cross-section, and angle steel (11) is welded at the connection between the steel corner post (1) and the well wall (2). The four sections of the well wall (2) include multiple H-beams (21), multiple sets of A-beam steel plate assemblies, and at least one set of combined steel plate components with through holes. Each set of A-beam steel plate assemblies includes two A-beam steel plates (22), and each combined steel plate component includes two combined steel plates (23). The multiple H-beams (21) are arranged between two adjacent steel angle posts (1). The angle steel (11) is connected to the flange of the adjacent H-beam (21). The flanges at both ends of two adjacent H-beams (21) are connected by A-beam steel plate assemblies or combined steel plate components, respectively. It also includes a steel cutting foot (3), and the bottom of the steel cutting foot (3) is wedge-shaped. The steel cutting foot (3) is hollow inside and has an opening at the top. A tie plate (31) is provided between the inner cavity sidewalls of the steel cutting foot (3). The steel corner post (1) and the H-beam (21) are both inserted into the inner cavity of the steel cutting foot (3) and located above the tie plate (31). It also includes a steel ring beam (4), which is rectangular in shape and is fitted on the top of the steel corner column (1) and the well wall (2); The combined steel plate (23) includes a first B-type steel plate (231), two C-type steel plates (232) and a second B-type steel plate (233). Both C-type steel plates (232) have semi-circular holes that cooperate with each other. When the combined steel plate (23) is assembled, the first B-type steel plate (231), two C-type steel plates (232) and the second B-type steel plate (233) are arranged from top to bottom. The semi-circular holes of the two C-type steel plates (232) are arranged opposite each other to form a round hole.

2. The recyclable modular steel structure caisson according to claim 1, characterized in that: The H-beam (21) and angle steel (11), the H-beam (21) and A-beam steel plate assembly, and the H-beam (21) and composite steel plate (23) are all bolted and fixed by multiple bolt assemblies (5); The bolt assembly (5) includes two nuts (51) and a steel thread (52); The two nuts (51) are respectively welded to the opposite sides of the angle steel (11), and the steel screw (52) passes through the angle steel (11) and the H-beam (21) and is bolted to the nuts (51); The two nuts (51) are respectively welded to the two A-type steel plates (22) on opposite sides. The steel screw (52) passes through the H-beam (21) and the two A-type steel plates (22) and is bolted to the nuts (51). The two nuts (51) are respectively welded to the two composite steel plates (23) on opposite sides. The steel screw (52) passes through the H-beam (21) and the two composite steel plates (23) and is bolted to the nuts.

3. A construction method for the recyclable modular steel structure caisson as described in any one of claims 1-2, characterized in that: The construction method includes the following steps: S1: Weld the steel cutting foot (3) into a whole at the well body position, and then fill the cavity of the steel cutting foot (3) with sand and stone; S2: Insert the steel angle post (1) and H-beam (21) into the steel cutting foot (3) respectively, and then bolt the A-type steel plate (22), the first B-type steel plate (231), the C-type steel plate (232) and the second steel plate (233) to the steel angle post (1) and H-beam (21) respectively with steel screws (52) to form the well wall (2); S3: Place the segmented steel ring beam (4) onto the steel corner column (1) and the well wall (2) and bolt them together to form an integral steel ring beam; S4: Caisson operation, using mechanical equipment to excavate soil down to the bottom of the sealing concrete; S5: Pour the bottom sealing concrete and pour the reinforced concrete base slab; S6: Trenchless pipeline construction operations such as pipe jacking and pipe pulling are carried out on a reinforced concrete base slab; S7: After the pipeline construction is completed, remove the construction machinery inside the well, backfill the well with soil, and remove the steel bolts from bottom to top as the soil is backfilled. S8: After the earthwork backfill is close to the ground, remove the steel ring beam (4), use mechanical equipment to pull out the A-type steel plate (22), the first B-type steel plate (231), the C-type steel plate (232) above the opening and the H-type steel (21), and then remove the steel corner column (1) to complete the demolition.

4. The construction method of a recyclable modular steel structure caisson according to claim 3, characterized in that: In step S1, before welding the steel foot (3), the ground at the well body location is leveled and underground obstacles at the steel foot (3) of the caisson are cleared.

5. The construction method of a recyclable modular steel structure caisson according to claim 3, characterized in that: Step S5 can also be: placing a steel plate directly on the sealing concrete to make a steel base plate.

6. The construction method of a recyclable modular steel structure caisson according to claim 3, characterized in that: The caisson operation in step S4 can be carried out using either dewatering or non-dewatering methods, depending on the specific geological conditions of the site.

7. The construction method of a recyclable modular steel structure caisson according to claim 3, characterized in that: Step S7 also includes: constructing inspection wells that meet the requirements of hydraulic engineering.

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