Large-scale single-wall steel hanging box cofferdam capable of rapidly plugging seams through tension-compression combined suspenders and construction method

Abstract

The invention relates to a large single-wall steel hanging box cofferdam with a tension-compression combined suspender for rapid joint plugging and a construction method. The construction method comprises the following steps of steel hanging box suspender installation, connection of a bottom plate and a wall body, steel hanging box heat preservation layer installation, steel pile casing and bottom plate joint plugging and steel hanging box accurate positioning installation. The method has the beneficial effects that a tension-compression combined suspender technology is adopted, a combined structure of the steel wire rope and the steel suspender is adopted, the steel suspender is connected and fastened with the outrigger and the bottom plate through the jacking device, the length of the steel suspender meets the design requirement through the suspender adjusting device, the operation is simple, the steel consumption is reduced, and the construction cost is reduced; a bottom plate and wall body rapid connection technology is adopted, limiting baffles and wedge-shaped blocks are arranged on the inner side and the outer side of a steel hanging box bottom plate to rapidly position a hanging box wall body, an upper top plate and a lower top plate are connected through threaded rods, mounting and dismounting are convenient, underwater operation is not needed, construction safety is improved, and wall body mounting perpendicularity is improved.

Description

Technical Field

[0001] The invention belongs to the field of large single-wall steel box cofferdam construction, and in particular relates to a large single-wall steel box cofferdam with a tension-compression combined hanger rod for rapid caulking and a construction method. Background Art

[0002] Steel box cofferdams have the advantages of short construction period, good water blocking effect, no need to sink into the riverbed, and little interference with navigation. They are widely used in the construction of underwater bridge pedestals. The commonly used single-wall steel box cofferdams generally have small structural dimensions, light weight, and shallow submergence depth. They are suitable for construction environments with small water depth, low flow rate, and small surges. For large high-pile pedestals or complex water environments such as strong winds and waves, deep water and rapids, the use of single-wall high box cofferdams can save construction costs and shorten construction periods to the greatest extent. However, due to the large structural dimensions of the steel box, the complex structural force, and the short effective construction time in complex waters, conventional single-wall steel boxes are difficult to apply, and innovative design and improvement of the steel box cofferdam structure, detailed structure, and construction technology are required.

[0003] In summary, it is very meaningful to seek a large single-wall steel box cofferdam and construction method with high construction efficiency, low construction cost and simple operation for rapid caulking. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a large single-wall steel box cofferdam with a tension-compression combined suspension rod for rapid caulking and a construction method.

[0005] This large-scale single-wall steel box cofferdam construction system with tension-compression combined suspenders for rapid caulking includes a steel casing, a cantilever beam, a bottom plate main beam, a built-in integral insulation device and a bottom plate; The main beam of the bottom plate is arranged under 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 inside the steel hanging box wall; The steel casing passes through the bottom plate, a caulking device is arranged in the gap formed by the steel casing and the bottom plate, a steel hanging box positioning device and a positioning groove are arranged on the top of the steel casing, and a steel hanging box cantilever beam is arranged in the positioning groove.

[0006] Preferably, 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 tightened by the 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.

[0007] Preferably, the outer periphery of the steel hanging box wall is welded with annular main beams and annular secondary beams, and the bottom plate main beam and bottom plate secondary beam are arranged at the bottom of the bottom plate; top plates are welded at the top and bottom of the steel cofferdam, and diagonal braces are 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 threaded rods; limit baffles and wedge blocks are arranged on the bottom plate for positioning the steel hanging box wall.

[0008] Preferably, the built-in integral insulation device comprises a first insulation plate, an insulating heating rod and a second insulation plate; the insulating heating rod is connected to the connecting plates at the upper and lower ends of the first insulation plate, a number of connecting short columns are evenly distributed on the insulating heating rod, each 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 insulation plate.

[0009] Preferably, the steel casing is placed in a frame composed of a bottom plate inclined beam, a bottom plate main beam and a bottom plate secondary beam, and the caulking device includes a lower arc-shaped sealing plate, tightening bolts and an upper arc-shaped sealing plate, the lower arc-shaped sealing plate and the upper arc-shaped sealing plate are fixed by connecting columns, the lower arc-shaped sealing plate is flush with the bottom plate and is fixed by tightening bolts.

[0010] Preferably, the steel hoisting box positioning device includes vertical steel sections, oblique steel sections and supporting corbels, and the vertical steel sections and oblique steel sections 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 hoisting box cantilever beam is arranged on the positioning groove, and the steel hoisting box cantilever beam and the inner wall of the steel casing are connected by supporting corbels.

[0011] The construction method of the large single-wall steel hanging box cofferdam construction system with tension-compression combined hanger rods for rapid caulking comprises the following steps: 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.

[0012] The beneficial effects of the present invention are: 1) The present invention adopts tension-compression combined hanger technology, a combined structure of steel wire rope and steel hanger, and a tightening device to ensure that the steel hanger is firmly connected to the cantilever beam and the bottom plate. The hanger adjustment device is used to make the length of the steel hanger meet the design requirements. The operation is simple, the steel consumption is reduced, and the construction cost is reduced.

[0013] 2) The present invention adopts the technology of quick connection between the bottom plate and the wall. Limit baffles and wedge blocks are arranged on the inside and outside of the bottom plate of the steel hanging box to quickly position the hanging box wall. The upper and lower top plates are connected by threaded rods. It is easy to install and dismantle, does not require underwater operations, improves construction safety, and improves the verticality of wall installation.

[0014] 3) The present invention adopts the technology of built-in integral insulation board. When the seawater temperature is low, the telescopic rod of the built-in integral insulation device is extended to make the heating head touch the second insulation board to heat the insulation board. When the temperature meets the requirement, the telescopic rod is retracted to stop heating, thereby avoiding cracks on the surface of the pedestal due to the low seawater temperature, fast flow, fast cooling speed of the surface, and large temperature difference between the inner and outer surfaces, thereby improving the durability of the structure.

[0015] 4) The present invention adopts the technology of rapid sealing of the gap between the steel casing and the bottom plate. The upper and lower arc-shaped sealing plates of the sealing device are fixed by connecting columns. The upper arc-shaped sealing plate is flush with the bottom plate and is fixed by tightening bolts to strengthen the connection, thereby avoiding the problem of bottom sealing concrete being washed away and bottom sealing failure under complex sea conditions such as rapids and large waves.

[0016] 5) The present invention adopts the precise positioning technology of the steel hanging box. The inclined steel welded on the top of the steel casing has an angle with the horizontal plane. The top of the casing is cut into a slot structure to form a positioning slot to accurately position the cantilever beam. This avoids the problem of using a hand winch in conjunction with a jack to adjust the plane position and elevation of the hanging box, the long time of construction occupying the lifting equipment, the difficulty in adjusting the position and correcting the deviation, and the high safety risk of construction, thereby improving the construction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a plan view of the steel hanging box structure; Figure 2It is the elevation view of the steel hanging box structure; Figure 3 It is the installation diagram of the steel hanger structure; Figure 4 It is a structural schematic diagram of the steel boom adjustment device; Figure 5 It is a schematic diagram of the connection between the base plate and the wall; Figure 6 It is a side view of the built-in integral insulation board; Figure 7 It is a schematic diagram of the structure of the built-in integral insulation board; Figure 8 is a schematic diagram of the structure of the plugging device; Fig. 9 is a schematic diagram of the installation of the plugging device; Fig.10 It is a schematic diagram of the precise positioning device for the steel hanging box.

[0018] Description of the accompanying drawings: 1-wire rope structure, 2-steel suspension rod structure, 3-steel suspension box wall, 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-oblique brace, 15-circumferential secondary beam, 16-built-in integral insulation device, 17-steel suspension box positioning device, 18-limit baffle, 19-wedge 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 pressure plate, 30-upper sleeve, 31-transmission gear, 32-bolt, 33-upper pressure plate, 34-spring rod, 35-fixed block, 36-first insulation plate, 37-connecting plate, 38-second insulation plate, 39-insulating heating rod, 40-telescopic rod, 41-heating head, 42-connecting short column, 43-lower arc-shaped blocking plate, 44-tightening bolt, 45-upper arc-shaped blocking plate, 46-vertical steel, 47-oblique steel, 48-supporting corbel, 49-connecting column, 50-positioning groove. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0020] Embodiment 1 As an example, Figures 1 to 10As shown, the construction system of the large single-wall steel box cofferdam with tension-compression combined suspenders for rapid caulking includes a steel casing 7, a cantilever beam 8, a bottom plate main beam 11, a built-in integral insulation device 16 and a bottom plate 20; The bottom plate main beam 11 is arranged below the bottom plate 20, and the cantilever beam 8 and the bottom plate main beam 11 are tightened by a tension-compression combination hanger rod, which is composed of a steel wire rope structure 1 and a steel hanger rod structure 2, wherein the steel hanger rod structure 2 is divided into an upper hanger rod 25 and a lower hanger rod 21, the top of the upper hanger rod 25 passes through the cantilever beam 8 and is connected to the cantilever beam 8 through a jacking device; the bottom of the lower hanger rod 21 passes through the bottom plate main beam 11 and is fixed to the bottom plate 20 through a jacking device; the jacking device is composed of a support rod 26, an upper annular plate 27, a lower annular plate 28 and bolts 32, the upper annular plate 27 and the lower annular plate 28 are connected to form a whole through the support rod 26, and are tightened by bolts 32; the lower part of the upper hanger rod 25 and the upper part of the lower hanger rod 21 It is connected through a boom adjustment device, which consists of a lower sleeve 22, a telescopic plate 23, an adjusting rod 24, a lower pressure plate 29, an upper sleeve 30, a transmission gear 31, an upper pressure plate 33 and a spring rod 34. The top of the upper pressure plate 33 and the bottom of the lower pressure plate 29 are respectively provided with upper and lower sleeves to fix the upper and lower booms; the upper and lower pressure plates are connected by welding the telescopic plate 23, and the spring rod 34 is installed on the lower sleeve 22. The transmission gear 31 is driven to operate by rotating the adjusting rod 24, and the transmission gear 31 drives the spring rod 34 to extend or contract; the wire rope structure 1 is adjacent to the steel boom 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 a wire rope anchoring device.

[0021] The steel hanging box wall 3 is arranged on the bottom plate 20, and the built-in integral heat preservation device 16 is arranged on the inner side of the steel hanging box wall 3; The steel casing 7 passes through the bottom plate 20, and a caulking device 9 is provided in the gap formed by the steel casing 7 and the bottom plate 20. A steel hanging box positioning device 17 and a positioning groove 50 are provided at the top of the steel casing 7, and a steel hanging box cantilever beam 8 is provided in the positioning groove 50.

[0022] Embodiment 2 As another embodiment, this embodiment 2 proposes, on the basis of the embodiment 1, a more specific construction system of a large single-wall steel box cofferdam with a tension-compression combined suspension rod for rapid caulking: The steel box wall 3 is welded with an annular main beam 6 and an annular secondary beam 15 on the periphery, and the bottom plate 20 is provided with a bottom plate main beam 11 and a bottom plate secondary beam 12; the top plate 13 is welded to the top and bottom of the steel cofferdam, and a diagonal brace 14 is provided between the top plate 13 and the steel box wall 3 to strengthen the connection, and the top plate 13 at the top and bottom of the steel cofferdam is connected by a threaded rod 5; a limit baffle 18 and a wedge block 19 are provided on the bottom plate 20 for positioning the steel box wall 3.

[0023] The built-in integral insulation device 16 includes a first insulation plate 36, an insulating heating rod 39 and a second insulation plate 38; the insulating heating rod 39 is connected to the connecting plates 37 at the upper and lower ends of the first insulation plate 36, and a number of connecting short columns 42 are evenly distributed on the insulating heating rod 39, and each connecting short column 42 is provided with a heating head 41 and a telescopic rod 40. When the sea water temperature is low, the telescopic rod 40 is extended so that the heating head 41 touches the second insulation plate 38 to heat the insulation plate. When the temperature meets the requirements, the telescopic rod 40 contracts and stops heating.

[0024] The steel casing 7 is placed in a frame composed of a bottom plate inclined beam 10, a bottom plate main beam 11 and a bottom plate secondary beam 12. The caulking device 9 is installed in the gap formed by the steel casing 7 and the bottom plate 20. The caulking 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 a connecting column 49. The lower arc-shaped sealing plate 43 is flush with the bottom plate 20 and is fixed by a tightening bolt 44.

[0025] The steel hanging box positioning device 17 is composed of a vertical steel section 46, an oblique steel section 47 and a supporting corbel 48. The vertical steel section 46 and the oblique steel section 47 are welded on the top of the steel casing 7 and fixed. The angle between the oblique steel section 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 groove 50, and the steel hanging box cantilever beam 8 is arranged on the supporting corbel 48 below the positioning groove 50 and welded to the inner wall of the steel casing 7.

[0026] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0027] Embodiment 3 As another embodiment, this embodiment 3 proposes, based on the embodiments 1 and 2, a construction method for a large single-wall steel box cofferdam with a tension-compression combined hanger rod for rapid caulking using this construction system, comprising the following steps: Step 1. Installation of the steel hanging box boom: the top of the upper pressure plate 33 and the lower pressure plate 29 are connected by welding the telescopic plate 23, and the spring rod 34 is installed on the lower sleeve 22. The transmission gear 31 is driven to operate by rotating the adjusting rod 24, and the transmission gear 31 drives the spring rod 34 to extend or contract; during the construction process, when the length of the upper and lower booms is not enough, the boom adjustment device is adjusted to make the length of the steel boom structure 2 meet the design requirements; the wire rope structure 1 is adjacent to the steel boom 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 a wire rope anchoring device.

[0028] Step 2: Connect the bottom plate to the wall: The outer periphery of the steel box wall 3 is welded with the annular main beam 6 and the annular secondary beam 15, and the bottom plate 20 is arranged above the bottom plate main beam 11 and the bottom plate secondary beam 12; the top plate 13 is welded to the top and bottom of the steel cofferdam, and a diagonal brace 14 is arranged to strengthen the connection, and the upper and lower top plates 13 are connected by threaded rods 5; the bottom plate 20 is provided with a limit baffle 18 and a wedge block 19 to accurately locate the position of the steel box wall 3. The bottom plate 20 is arranged above the bottom plate main beam 11; the steel box wall 3 is installed on the bottom plate 20.

[0029] Step three, installation of the insulation layer of the steel hanging box: a built-in integral insulation device 16 is arranged on the inner side of the steel hanging box wall 3 to heat and insulate the steel hanging box; the built-in integral insulation device 16 is placed as a whole on the inner side of the steel hanging box wall 3; the insulating heating rod 39 is installed on the connecting plate 37 of the first insulation board 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 sea water temperature is low, the telescopic rod 40 is extended to make the heating head 41 touch the second insulation board 38 to heat the insulation board. After the temperature meets the requirement, the telescopic rod 40 contracts and the heating stops.

[0030] Step 4: Sealing the gap between the steel casing and the bottom plate: a steel casing 7 is provided, and a sealing device 9 is installed in the gap formed by the steel casing 7 and the bottom plate 20; Step 5: Precise positioning and installation of the steel hanging box: weld the steel hanging box positioning device 17 and the steel hanging box cantilever beam 8 on the top of the steel casing 7; remove the steel hanging box wall 3.

[0031] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 and 2 can be referenced to each other and will not be described in detail in this application.

[0032] Embodiment 4 As another embodiment, this fourth embodiment proposes, on the basis of the third embodiment, a more specific construction method of a large single-wall steel box cofferdam with a tension-compression combined suspension rod for rapid caulking: Step 4: Seal the gap between the steel casing and the bottom plate: the steel casing 7 is placed in a frame composed of the bottom plate inclined beam 10, the bottom plate main beam 11 and the bottom plate secondary beam 12. The caulking device 9 is installed in the gap formed by the steel casing 7 and the bottom plate 20. It is composed 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 connecting columns 49. The upper arc-shaped sealing plate 43 is flush with the bottom plate 20 and is fixed by tightening bolts 44 to strengthen the connection.

[0033] Step 5: Lifting of the steel hoisting box: The assembled steel hoisting box is hoisted in good weather and transported to the pier construction waters by a self-propelled crane ship with the cooperation of the anchor boat. Before lifting, tie the top of the steel hoisting box with a wind-resistant cable to ensure the stability of the hoisting box and the adjustment of the plane position during the lifting process.

[0034] Precise positioning and installation of the steel hanging box: The steel hanging box precise positioning technology is adopted. The steel hanging box positioning device 17 is composed of vertical steel sections 46, oblique steel sections 47 and supporting corbels 48. The vertical steel sections 46 and the oblique steel sections 47 are welded on the top of the steel casing 7 for fixation. The angle between the oblique steel sections 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 hanging box cantilever beam 8 is arranged on the supporting corbel 48 below the positioning slot 50 and is welded to the inner wall of the steel casing 7.

[0035] Dismantling of steel hanging box: The steel hanging box is dismantled by floating crane. When dismantling the wall 3 of the steel hanging box, the operator first removes the nuts on the threaded rods 5 between the wall and the top plate 13, lowers the threaded rods 5 with a thin rope, and the workers retrieve the threaded rods 5 on the transport boat, then take out the wedge-shaped blocks 19 between the bottom and side plates, and dismantle the hanging box wall 3 piece by piece by the floating crane.

[0036] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiment 3 can be referenced to each other and will not be described in detail in this application.

[0037] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced 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 under 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 inside the steel hanging box wall; The steel casing passes through the bottom plate, a caulking device is arranged in the gap formed by the steel casing and the bottom plate, a steel hanging box positioning device and a positioning groove are arranged on the top of the steel casing, and a steel hanging box cantilever beam is arranged in the positioning groove.

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 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 outer periphery of the steel hanging box wall is welded with an annular main beam and an annular secondary beam, and the bottom of the bottom plate is arranged with a bottom plate main beam and a bottom plate secondary beam; the top and bottom of the steel cofferdam are welded with top plates, 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 threaded rods; a limit baffle and a wedge-shaped block are arranged on the bottom plate for positioning the steel hanging box wall.

4. 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 built-in integral insulation device includes a first insulation board, an insulating heating rod and a second insulation board; the insulating heating rod is connected to the connecting plates at the upper and lower ends of the first insulation board, and a number of connecting short columns are evenly distributed on the insulating heating rod, and each 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 insulation board.

5. 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 steel casing is placed in a frame composed of a bottom plate inclined beam, a bottom plate main beam and a bottom plate secondary beam. The caulking device includes a lower arc-shaped sealing plate, a tightening bolt and an upper arc-shaped sealing plate. The lower arc-shaped sealing plate and the upper arc-shaped sealing plate are fixed by connecting columns. The lower arc-shaped sealing plate is flush with the bottom plate and is fixed by tightening bolts.

6. 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 steel hoisting box positioning device includes vertical steel sections, oblique steel sections and supporting corbels. The vertical steel sections and oblique steel sections 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 hoisting box cantilever beam is arranged on the positioning groove, and the steel hoisting box cantilever beam and the inner wall of the steel casing are connected by supporting corbels.

7. 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 any one of claims 1 to 6, 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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