Large single-wall steel cofferdam with rapid crack plugging for combined tension and compression suspender and construction method

Abstract

The present invention relates to a large single-wall steel cofferdam with a quick seam plugging for a combined tension and compression suspender and a construction method, including the following steps: installation of the steel cofferdam suspender, connection between the bottom plate and the wall body, installation of the steel cofferdam insulation layer, plugging of the gap between the steel casing and the bottom plate, and precise positioning and installation of the steel cofferdam. The beneficial effects of the present invention are as follows: For the combined tension and compression suspender technology, a combined structure of steel wire ropes and steel suspenders is adopted. The jacking device is used to ensure the tight connection between the steel suspender and the cantilever beam and the bottom plate. The length of the steel suspender is adjusted to meet the design requirements through the suspender adjusting device. The operation is simple, the steel consumption is reduced, and the construction cost is lowered; For the quick connection technology between the bottom plate and the wall body, limit baffles and wedge-shaped blocks are arranged on the inner and outer sides of the steel cofferdam bottom plate to quickly position the cofferdam wall body. The upper and lower top plates are connected by threaded rods, which are convenient for installation and removal and do not require underwater operations, improving the construction safety and the verticality of the wall body installation.

Description

Technical Field

[0001] The invention belongs to the field of construction of large single-wall steel cofferdams, and particularly relates to a large single-wall steel cofferdam with a tension-compression combined suspender for rapid seam plugging and a construction method thereof. Background Art

[0002] Steel cofferdams have the advantages of short construction period, good water blocking effect, no need to sink into the riverbed, and little interference with navigation, and are widely used in the construction of bridge underwater caps. The commonly used single-wall steel cofferdam generally has small structural dimensions, light weight, and shallow immersion depth, and is suitable for construction environments with small water depth, small flow velocity, and small surges. For large high-pile caps or complex water areas with large waves and deep and rapid water flow, the construction of a single-wall high cofferdam can save construction costs and shorten the construction period to the greatest extent. However, due to the large structural dimensions of the steel cofferdam, complex structural forces, and short effective construction operation time in complex water areas, conventional single-wall steel cofferdams are difficult to apply, and innovative designs and improvements need to be made to the structure, detailed structure, and construction technology of the steel cofferdam.

[0003] In summary, it is very meaningful to seek a large single-wall steel cofferdam with rapid seam plugging and a construction method thereof that have high construction efficiency, low construction cost, and simple operation. Summary of the Invention

[0004] The purpose of the invention is to overcome the deficiencies in the prior art and provide a large single-wall steel cofferdam with a tension-compression combined suspender for rapid seam plugging and a construction method thereof.

[0005] This construction system of a large single-wall steel cofferdam with a tension-compression combined suspender for rapid seam plugging includes a steel casing, a cantilever beam, a bottom plate main beam, an integral built-in thermal insulation device, and a bottom plate;

[0006] The bottom plate main beam is arranged below the bottom plate. The cantilever beam and the bottom plate main beam are fixed by a tension-compression combined suspender. The steel cofferdam wall is arranged on the bottom plate, and the integral built-in thermal insulation device is arranged on the inner side of the steel cofferdam wall;

[0007] The steel casing penetrates through the bottom plate. A seam plugging device is arranged in the gap formed between the steel casing and the bottom plate. A steel cofferdam positioning device and a positioning groove are arranged at the top of the steel casing, and a steel cofferdam cantilever beam is arranged in the positioning groove.

[0008] Preferably, the tension-compression combined suspender includes a steel wire rope structure and a steel suspender structure. The steel suspender structure includes an upper suspender and a lower suspender. The top of the upper suspender passes through the cantilever beam and is connected to the cantilever beam through a tightening device. The bottom of the lower suspender passes through the main floor beam and is fixed to the floor through a tightening device. The tightening device includes a support rod, an upper annular plate, a lower annular plate and a bolt. The upper annular plate and the lower annular plate are connected by the support rod to form an integral body and are tightened by the bolt. The lower part of the upper suspender and the upper part of the lower suspender are connected by a suspender adjusting device. The suspender adjusting device includes a lower sleeve, a telescopic plate, an adjusting rod, a lower bearing plate, an upper sleeve, a transmission gear, an upper bearing plate and a spring rod. Sleeves are respectively arranged at the top of the upper bearing plate and the bottom of the lower bearing plate for fixing to the upper suspender and the lower suspender. The sides of the upper bearing plate and the lower bearing plate are connected by welding the telescopic plate. A spring rod is installed in the middle. A transmission gear is sleeved on the spring rod. The transmission gear is connected to an adjusting rod for controlling the elongation or contraction of the spring rod.

[0009] Preferably, circumferential main beams and circumferential secondary beams are welded on the periphery of the steel pontoon wall. Main floor beams and secondary floor beams are arranged at the bottom of the floor. Top plates are welded at the top and bottom of the steel cofferdam. Diagonal braces are arranged between the top plate and the steel pontoon wall. The top plates at the top and bottom of the steel cofferdam are connected by threaded rods. Limit baffles and wedge-shaped blocks are arranged on the floor for positioning the steel pontoon wall.

[0010] Preferably, the built-in integral heat preservation device includes a first heat preservation board, an insulating heating rod and a second heat preservation board. The insulating heating rod is connected to the connecting plates at the upper and lower ends of the first heat preservation board. A number of connecting short columns are evenly arranged on the insulating heating rod. An expansion rod is arranged on each section of the connecting short column. A heating head is arranged at the end of the expansion rod for heating the second heat preservation board.

[0011] Preferably, the steel casing is placed in a framework composed of floor diagonal beams, main floor beams and secondary floor beams. The caulking device includes a lower arc-shaped caulking plate, a tightening bolt and an upper arc-shaped caulking plate. The lower arc-shaped caulking plate and the upper arc-shaped caulking plate are fixed by a connecting column. The lower arc-shaped caulking plate is flush with the floor and is fixed by a tightening bolt.

[0012] Preferably, the steel pontoon positioning device includes vertical steel shapes, diagonal steel shapes and supporting corbels. The vertical steel shape is welded to the top of the steel casing and fixed to the diagonal steel shape. A positioning groove is cut at the top of the steel casing. The positioning groove is in the shape of an inverted V-shaped clamping groove structure. The cantilever beam of the steel pontoon is arranged on the positioning groove. The cantilever beam of the steel pontoon and the inner wall of the steel casing are connected by supporting corbels.

[0013] The construction method of this tension-compression combined suspender rapid caulking large single-wall steel pontoon cofferdam construction system includes the following steps:

[0014] Step 1: Installation of the steel pontoon suspender: Adjust the length of the steel suspender structure through the suspender adjusting device; and set the steel wire rope structure to connect the cantilever beam and the main floor beam.

[0015] Step 2. Connection between the bottom plate and the wall body: The bottom plate is arranged above the main bottom plate girder; the steel suspension box wall body is installed on the bottom plate.

[0016] Step 3. Installation of the thermal insulation layer of the steel suspension box: An internal integral thermal insulation device is arranged on the inner side of the steel suspension box wall body to heat and insulate the steel suspension box.

[0017] Step 4. Sealing the gap between the steel casing and the bottom plate: A steel casing is set, and the caulking device is installed in the gap formed between the steel casing and the bottom plate.

[0018] Step 5. Precision positioning and installation of the steel suspension box: The steel suspension box positioning device and the steel suspension box cantilever beam are welded to the top of the steel casing; the steel suspension box wall body is removed.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1) The present invention adopts the tension and compression combined hanger technology, with a combined structure of steel wire ropes and steel hangers. The top-tightening device is used to ensure the firm connection between the steel hanger and the cantilever beam and the bottom plate. The length of the steel hanger meets the design requirements through the hanger adjusting device. The operation is simple, the steel consumption is reduced, and the construction cost is lowered.

[0021] 2) The present invention adopts the rapid connection technology between the bottom plate and the wall body. Limit baffles and wedge-shaped blocks are arranged on the inner and outer sides of the bottom plate of the steel suspension box to quickly position the wall body of the suspension box. The upper and lower top plates are connected by threaded rods. The installation and removal are convenient, and underwater operation is not required, improving the construction safety and the verticality of the wall body installation.

[0022] 3) The present invention adopts the internal integral thermal insulation board technology. When the seawater temperature is low, the telescopic rod of the internal integral thermal insulation device extends to make the heating head touch the second thermal insulation board to heat the thermal insulation board. After the temperature meets the requirements, the telescopic rod contracts and the heating stops, avoiding cracks on the surface of the bearing platform caused by the low seawater temperature, fast flow rate, fast surface cooling speed, and large temperature difference between the inner and outer surfaces, and improving the durability of the structure.

[0023] 4) The present invention adopts the rapid sealing technology for the gap between the steel casing and the bottom plate. The upper and lower arc-shaped caulking plates of the caulking device are fixed by connecting columns. The upper arc-shaped caulking plate is flush with the bottom plate and fixed by tightening bolts to strengthen the connection, avoiding the problem that the underwater concrete is easily washed away and the underwater sealing fails under complex sea conditions such as strong currents and large surges.

[0024] 5) The present invention adopts the precise positioning technology for the steel suspension box. The inclined section steel is welded to the top of the steel casing at an angle with the horizontal plane. The top of the casing is cut into a groove structure to form a positioning groove for precisely positioning the position of the cantilever beam, avoiding the problems of long occupation time of the hoisting equipment for adjusting the plane position and elevation of the suspension box with a manual hoist and a jack, difficult adjustment and deviation correction, and high construction safety risks, and improving the construction speed. Description of the Drawings

[0025] Figure 1 It is the plan view of the steel suspension box structure;

[0026] Figure 2 It is the elevation view of the steel suspension box structure;

[0027] Figure 3 It is the installation schematic diagram of the steel suspension rod structure;

[0028] Figure 4 It is the structural schematic diagram of the steel suspension rod adjusting device;

[0029] Figure 5 It is the connection schematic diagram of the bottom plate and the wall body;

[0030] Figure 6 It is the side view of the built-in integral thermal insulation board;

[0031] Figure 7 It is the structural schematic diagram of the built-in integral thermal insulation board;

[0032] Figure 8 It is the structural schematic diagram of the plugging device;

[0033] Figure 9 It is the installation schematic diagram of the plugging device;

[0034] Figure 10 It is the schematic diagram of the precise positioning device of the steel suspension box.

[0035] Explanation of reference numerals: 1 - wire rope structure, 2 - steel suspension rod structure, 3 - steel suspension box wall body, 4 - upper top plate, 5 - threaded rod, 6 - circumferential main beam, 7 - steel casing, 8 - cantilever beam, 9 - caulking device, 10 - bottom plate inclined beam, 11 - bottom plate main beam, 12 - bottom plate secondary beam, 13 - top plate, 14 - diagonal brace, 15 - circumferential secondary beam, 16 - built-in integral thermal insulation device, 17 - steel suspension box positioning device, 18 - limit baffle, 19 - wedge-shaped block, 20 - bottom plate, 21 - lower suspension rod, 22 - lower sleeve, 23 - telescopic plate, 24 - adjusting rod, 25 - upper suspension rod, 26 - support rod, 27 - upper annular plate, 28 - lower annular plate, 29 - lower bearing plate, 30 - upper sleeve, 31 - transmission gear, 32 - bolt, 33 - upper bearing plate, 34 - spring rod, 35 - fixed block, 36 - first thermal insulation board, 37 - connecting plate, 38 - second thermal insulation board, 39 - insulating heating rod, 40 - telescopic rod, 41 - heating head, 42 - connecting short column, 43 - lower arc-shaped plugging plate, 44 - tightening bolt, 45 - upper arc-shaped plugging plate, 46 - vertical section steel, 47 - diagonal section steel, 48 - support bracket, 49 - connecting column, 50 - positioning groove. Detailed implementation manners

[0036] The present invention will be further described below in conjunction with embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be noted that for those of ordinary skill in the technical field, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0037] Embodiment 1

[0038] As an embodiment, as Figures 1 to 10 shown, this construction system of a large single-wall steel cofferdam with a quick-sealing joint for a combined tension and compression suspender boom includes a steel casing 7, a cantilever beam 8, a bottom plate main beam 11, an integral built-in thermal insulation device 16, and a bottom plate 20;

[0039] The bottom plate main beam 11 is arranged below the bottom plate 20. The cantilever beam 8 and the bottom plate main beam 11 are fixed by a combined tension and compression suspender boom. The combined tension and compression suspender boom is composed of a wire rope structure 1 and a steel suspender structure 2. The steel suspender structure 2 is divided into an upper suspender 25 and a lower suspender 21. The top of the upper suspender 25 passes through the cantilever beam 8 and is connected to the cantilever beam 8 through a tightening device; the bottom of the lower suspender 21 passes through the bottom plate main beam 11 and is fixed to the bottom plate 20 through a tightening device; the tightening device is composed of a support rod 26, an upper annular plate 27, a lower annular plate 28, and a bolt 32. The upper annular plate 27 and the lower annular plate 28 are connected by the support rod 26 to form an integral body and are tightened by the bolt 32; the lower part of the upper suspender 25 and the upper part of the lower suspender 21 are connected by a suspender adjusting device. The suspender adjusting device is composed of a lower sleeve 22, a telescopic plate 23, an adjusting rod 24, a lower bearing plate 29, an upper sleeve 30, a transmission gear 31, an upper bearing plate 33, and a spring rod 34. The top of the upper bearing plate 33 and the bottom of the lower bearing plate 29 are respectively provided with upper and lower sleeves to be fixed to the upper and lower suspenders; the upper and lower bearing plates are connected by welding the telescopic plate 23, and the spring rod 34 is installed on the lower sleeve 22. By rotating the adjusting rod 24, the transmission gear 31 is driven to operate, and the transmission gear 31 drives the spring rod 34 to extend or contract; the wire rope structure 1 is adjacent to the steel suspender structure 2, and its upper end and lower end are both connected to the cantilever beam 8 and the bottom plate main beam 11 through wire rope anchoring devices.

[0040] The steel cofferdam wall 3 is arranged on the bottom plate 20, and the integral built-in thermal insulation device 16 is arranged inside the steel cofferdam wall 3;

[0041] The steel casing 7 penetrates through the bottom plate 20. A joint-sealing device 9 is arranged in the gap formed between the steel casing 7 and the bottom plate 20. A steel cofferdam positioning device 17 and a positioning groove 50 are arranged at the top of the steel casing 7, and the cantilever beam 8 of the steel cofferdam is arranged in the positioning groove 50.

[0042] Embodiment 2

[0043] As another embodiment, this second embodiment is proposed based on the first embodiment, and a more specific construction system for a large single-wall steel cofferdam with a combined tension and compression suspension rod for rapid crack sealing:

[0044] The circumferential main beam 6 and circumferential secondary beam 15 are welded on the periphery of the steel cofferdam wall body 3, and the bottom main beam 11 and bottom secondary beam 12 are arranged at the bottom of the bottom plate 20; the top plate 13 is welded at both the top and bottom of the steel cofferdam, and the diagonal brace 14 is arranged between the top plate 13 and the steel cofferdam wall body 3 to strengthen the connection, and the top plates 13 at the top and bottom of the steel cofferdam are connected by the threaded rod 5; the limiting baffle 18 and the wedge-shaped block 19 are arranged on the bottom plate 20 for positioning the steel cofferdam wall body 3.

[0045] The built-in integral heat preservation device 16 includes the first heat preservation board 36, the insulating heating rod 39 and the second heat preservation board 38; the insulating heating rod 39 is connected to the connecting plates 37 at the upper and lower ends of the first heat preservation board 36, and a number of connecting short columns 42 are evenly arranged on the insulating heating rod 39, and a heating head 41 and a telescopic rod 40 are arranged on each section of the connecting short column 42. When the seawater temperature is relatively low, the telescopic rod 40 extends to make the heating head 41 touch the second heat preservation board 38 to heat the heat preservation board, and after the temperature meets the requirements, the telescopic rod 40 contracts and the heating stops.

[0046] The steel casing 7 is placed in the framework composed of the bottom plate diagonal beam 10, the bottom plate main beam 11 and the bottom plate secondary beam 12, and the crack sealing device 9 is installed in the gap formed between the steel casing 7 and the bottom plate 20. The crack sealing device 9 includes a lower arc-shaped sealing plate 43, a tightening bolt 44 and an upper arc-shaped sealing plate 45. The lower arc-shaped sealing plate 43 and the upper arc-shaped sealing plate 45 are fixed by the connecting column 49. The lower arc-shaped sealing plate 43 is flush with the bottom plate 20 and is fixed by the tightening bolt 44.

[0047] The steel cofferdam positioning device 17 is composed of a vertical section steel 46, an inclined section steel 47 and a supporting bracket 48. The vertical section steel 46 and the inclined section steel 47 are welded and fixed at the top of the steel casing 7, and the included angle between the inclined section steel 47 and the horizontal plane is 70°; the top of the casing is cut into an inverted "eight" - shaped slot structure to form a positioning slot 50, and the steel cofferdam cantilever beam 8 is arranged on the supporting bracket 48 arranged below the positioning slot 50 and is welded on the inner wall of the steel casing 7.

[0048] It should be noted that the same or similar parts in this embodiment and the first embodiment can be referred to each other and will not be elaborated in this application.

[0049] Embodiment Three

[0050] As another embodiment, this third embodiment is proposed based on the first and second embodiments, and a construction method for a large single-wall steel cofferdam with a combined tension and compression suspension rod for rapid crack sealing using this construction system includes the following steps:

[0051] Step 1. Installation of the steel suspension box's suspension rods: The top of the upper bearing plate 33 and the lower bearing plate 29 are connected by welding the telescopic plate 23, and the spring rod 34 is installed on the lower sleeve 22. By rotating the adjusting rod 24, the transmission gear 31 is driven to operate, and the transmission gear 31 drives the spring rod 34 to extend or contract; during the construction process, when the lengths of the upper and lower suspension rods are insufficient, the suspension rod adjusting device is adjusted to make the length of the steel suspension rod structure 2 meet the design requirements. The steel wire rope structure 1 is adjacent to the steel suspension rod structure 2, and its upper end is connected to the cantilever beam 8 and the lower end is connected to the bottom plate main beam 11 through the steel wire rope anchoring device.

[0052] Step 2. Connection between the bottom plate and the wall body: The circumferential main beam 6 and the circumferential secondary beam 15 are welded on the periphery of the steel suspension box wall body 3. The bottom plate 20 is arranged above the bottom plate main beam 11 and the bottom plate secondary beam 12; the top and bottom of the steel cofferdam are both welded with the top plate 13, and the diagonal braces 14 are set to strengthen the connection. The upper and lower top plates 13 are connected by the threaded rod 5; the limit baffle 18 and the wedge-shaped block 19 are set on the bottom plate 20 to accurately position the position of the steel suspension box wall body 3. The bottom plate 20 is arranged above the bottom plate main beam 11; the steel suspension box wall body 3 is installed on the bottom plate 20.

[0053] Step 3. Installation of the heat preservation layer of the steel suspension box: An internal integral heat preservation device 16 is arranged inside the steel suspension box wall body 3 to heat and insulate the steel suspension box; the internal integral heat preservation device 16 is integrally placed inside the steel suspension box wall body 3; the insulating heating rod 39 is installed on the connecting plate 37 of the first heat preservation plate 36, and the heating head 41 is connected to the telescopic rod 40 and installed on a number of connecting short columns 42 evenly arranged on the insulating heating rod 39; when the seawater temperature is relatively low, the telescopic rod 40 extends to make the heating head 41 touch the second heat preservation plate 38 to heat the heat preservation plate. After the temperature meets the requirements, the telescopic rod 40 contracts and the heating stops.

[0054] Step 4. Sealing the gap between the steel casing and the bottom plate: The steel casing 7 is set, and the gap blocking device 9 is installed in the gap formed between the steel casing 7 and the bottom plate 20;

[0055] Step 5. Precise positioning and installation of the steel suspension box: The steel suspension box positioning device 17 and the steel suspension box cantilever beam 8 are welded on the top of the steel casing 7; the steel suspension box wall body 3 is removed.

[0056] It should be noted that the parts that are the same or similar to those in Embodiment 1 and Embodiment 2 in this embodiment can be referred to each other and will not be elaborated in this application.

[0057] Embodiment 4

[0058] As another embodiment, this Embodiment 4 is proposed on the basis of Embodiment 3, and a more specific construction method for a large single-wall steel cofferdam with a combined tension and compression suspension rod and rapid gap blocking:

[0059] Step 4. Sealing the gap between the steel casing and the bottom plate: The steel casing 7 is placed within the framework composed of the bottom plate diagonal beams 10, the bottom plate main beams 11, and the bottom plate secondary beams 12. The gap-sealing device 9 is installed in the gap formed between the steel casing 7 and the bottom plate 20, and it consists of an arc-shaped sealing plate 43, a tightening bolt 44, and an upper arc-shaped sealing plate 45. The upper and lower arc-shaped sealing plates 43 are fixed by a connecting column 49. The upper arc-shaped sealing plate 43 is flush with the bottom plate 20 and is fixed by the tightening bolt 44 to strengthen the connection.

[0060] Step 5. Hoisting the steel pontoon as a whole: When hoisting the assembled steel pontoon, select good weather conditions. With the assistance of an anchor boat, it is hoisted to the construction water area of the pier by a self-propelled crane ship. Before hoisting, tie anti-wind cables to the top opening of the steel pontoon to ensure the stability of the pontoon during hoisting and the adjustment of its planar position.

[0061] Precise positioning and installation of the steel pontoon: Adopt the precise positioning technology of the steel pontoon. The steel pontoon positioning device 17 consists of vertical steel profiles 46, inclined steel profiles 47, and supporting brackets 48. The vertical steel profile 46 is welded to the top of the steel casing 7 and fixed with the inclined steel profile 47. The included angle between the inclined steel profile 47 and the horizontal plane is 70°. The top of the casing is cut into an inverted "eight"-shaped slot structure to form a positioning slot 50. The cantilever beam 8 of the steel pontoon is arranged on the supporting bracket 48 provided below the positioning slot 50 and welded to the inner wall of the steel casing 7.

[0062] Demolition of the steel pontoon: The steel pontoon is demolished using a floating crane. When demolishing the wall body 3 of the steel pontoon, the operator first removes the nuts on the threaded rods 5 between the wall body and the top plate 13, lowers the threaded rods 5 with a thin rope, and the workers retrieve the threaded rods 5 on the traffic boat. Then, the wedge-shaped blocks 19 between the bottom side plates are taken out, and the wall body 3 of the pontoon is demolished piece by piece by the floating crane.

[0063] It should be noted that the parts that are the same or similar to those in Embodiment 3 in this embodiment can be referred to each other and will not be elaborated in this application.

[0064] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

Claims

1. A large-scale single-wall steel box cofferdam construction system with tension-compression combined suspension rods for rapid caulking, characterized in that: It includes steel casing, cantilever beam, base plate main beam, built-in integral thermal insulation device and base plate; The main beam of the bottom plate is arranged below the bottom plate, the cantilever beam and the main beam of the bottom plate are tightened by a tension-compression combined hanger rod, the steel hanging box wall is arranged on the bottom plate, and the built-in integral thermal insulation device is arranged on the inner side of the steel hanging box wall; the annular main beam and the annular secondary beam are welded on the periphery of the steel hanging box wall, and the bottom plate main beam and the bottom plate secondary beam are arranged at the bottom of the bottom plate; the top plates are welded on the top and bottom of the steel cofferdam, and an inclined brace is arranged between the top plate and the steel hanging box wall, and the top plates at the top and bottom of the steel cofferdam are connected by a threaded rod; a limit baffle and a wedge-shaped block are arranged on the bottom plate for positioning the steel hanging box wall; the built-in integral thermal insulation device comprises a first thermal insulation plate, an insulating heating rod and a second thermal insulation plate; the insulating heating rod is connected to the connecting plates at the upper and lower ends of the first thermal insulation plate, and a number of connecting short columns are evenly arranged on the insulating heating rod, and each section of the connecting short column is provided with a telescopic rod, and a heating head is provided at the end of the telescopic rod for heating the second thermal insulation plate; The steel casing passes through the base plate, and a caulking device is provided in the gap formed by the steel casing and the base plate. A steel hanging box positioning device and a positioning groove are provided at the top of the steel casing, and a steel hanging box cantilever beam is provided in the positioning groove; the steel casing is placed in a frame composed of the base plate inclined beam, the base plate main beam and the base plate secondary beam, and the caulking device includes a lower arc-shaped blocking plate, a tightening bolt and an upper arc-shaped blocking plate, and the lower arc-shaped blocking plate and the upper arc-shaped blocking plate are fixed by a connecting column, and the lower arc-shaped blocking plate is flush with the base plate and fixed by a tightening bolt; the steel hanging box positioning device includes vertical steel, oblique steel and supporting corbels, and the vertical steel and the oblique steel are welded on the top of the steel casing for fixation; a positioning groove is cut on the top of the steel casing, and the positioning groove is an eight-shaped slot structure, the steel hanging box cantilever beam is arranged on the positioning groove, and the steel hanging box cantilever beam and the inner wall of the steel casing are connected by a supporting corbel.

2. The large-scale single-wall steel box cofferdam construction system with tension-compression combined suspension rods for rapid caulking according to claim 1 is characterized in that: The tension-compression combined hanger includes a wire rope structure and a steel hanger structure, wherein the steel hanger structure includes an upper hanger and a lower hanger, the top of the upper hanger passes through the cantilever beam and is connected to the cantilever beam through a tightening device; the bottom of the lower hanger passes through the main beam of the base plate and is fixed to the base plate through a tightening device; the tightening device includes a support rod, an upper annular plate, a lower annular plate and bolts, the upper annular plate and the lower annular plate are connected to form a whole through the support rod, and are tightened by bolts; the lower part of the upper hanger and the upper part of the lower hanger are connected through a hanger adjustment device, the hanger adjustment device includes a lower sleeve, a telescopic plate, an adjusting rod, a lower pressure plate, an upper sleeve, a transmission gear, an upper pressure plate and a spring rod, sleeves are respectively arranged at the top and the bottom of the upper pressure plate for fixing with the upper hanger and the lower hanger; the sides of the upper pressure plate and the lower pressure plate are connected by welding telescopic plates, a spring rod is installed in the middle, a transmission gear is sleeved on the spring rod, and the transmission gear is connected to an adjusting rod for controlling the extension or contraction of the spring rod.

3. The construction method of the large single-wall steel hanging box cofferdam construction system with tension-compression combined hanging rods for rapid caulking as claimed in claim 2 is characterized in that: The following steps are involved: Step 1: Installation of steel hanging box boom: adjust the length of the steel hanging rod structure through the boom adjustment device; and set up the wire rope structure to pull the cantilever beam and the bottom plate main beam; Step 2: Connect the bottom plate and the wall: The bottom plate is arranged above the bottom plate main beam; the steel hanging box wall is installed on the bottom plate; Step 3: Installation of insulation layer of steel hanging box: a built-in integral insulation device is arranged inside the wall of the steel hanging box to heat and insulate the steel hanging box; Step 4: Sealing the gap between the steel casing and the bottom plate: installing the steel casing, and installing the sealing device in the gap formed by the steel casing and the bottom plate; Step 5. Accurately position and install the steel hanging box: weld the steel hanging box positioning device and the steel hanging box cantilever beam on the top of the steel casing; remove the steel hanging box wall.

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