Overall lowering method suitable for bottomed steel hanging box in deepwater sea area and steel hanging box

Abstract

The invention relates to the technical field of civil construction, in particular to a method suitable for integrally lowering a bottomed steel hanging box in a deepwater sea area and the steel hanging box. Comprising the steps that a steel hanging box and a bottom plate are prefabricated in a factory, an air bag is laid on the bottom plate, and the bottom plate is installed on the steel hanging box; the water bottom of the steel hanging box lowering area is cleaned and leveled; the steel hanging box is transported to a lowering area, and the steel hanging box is hoisted to be lowered to the designed elevation along the steel casing; the air bag on the bottom plate is matched with hoisting equipment to lower the steel hoisting box, so that the steel hoisting box stably lands; a gap between the bottom plate and the steel casing is blocked through an air bag; and bottom sealing concrete is poured in the steel hanging box, and bearing platform construction is completed. The steel hanging box lowering construction method is suitable for the deepwater sea area and has the advantages of being high in construction safety and short in construction period, the procedures of overall lowering construction are greatly reduced, the efficiency of lowering construction of the steel hanging box in the deepwater sea area is improved, the steel hanging box is detachable and recycled, materials are saved, and the cost is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of civil construction, and in particular to an overall lowering method for a bottomed steel hanging box suitable for deep water areas and a steel hanging box. Background Art

[0002] With the rapid development of economy at home and abroad, in the process of vigorously constructing coastal projects such as ports, waterways, and cross-sea bridges in my country, steel hanging boxes, with their solid structure and excellent durability, provide a stable and reliable working environment for offshore construction operations. For example, a construction method for a steel hanging box entitled "A construction method for a reusable steel hanging box without bottom concrete" is provided, and the construction method includes the following steps: S1. Weld a counter-pressure support frame to the upper end of the prefabricated steel hanging box, lift it through lifting equipment, and lower the steel hanging box to the designed elevation. During the lowering process, keep the steel hanging box concentric with the pile foundation, and form a sealing groove in the gap between the steel hanging box and the pile foundation; S2. Weld and fix the counter-pressure support frame to the temporary platform steel pipe piles at both ends; S3. Install a steel hanging box in the sealing groove between the steel hanging box and the pile foundation. Install the airbag, and then inject compressed gas into the airbag to make the airbag seal the gap between the bottom plate of the steel hanging box and the pile foundation; S4, drain the water from the cofferdam to ensure no water leakage; S5, weld and fix the cofferdam and the pile foundation; S6, cut off the part of the pile foundation above the bottom plate of the steel hanging box, and then chisel the pile head; S7, construct the pier column; S8, deflate the airbag, remove the airbag, and let the water flow into the inner side of the cofferdam through the gap between the bottom plate of the steel hanging box and the pile foundation; S9, cut the welding part between the counter-pressure support frame and the temporary platform steel pipe piles at both ends, and lift the pressure support frame and the steel hanging box together. This construction method is simple, and the gap between the bottom plate and the pile foundation can be blocked by the airbag, which reduces the process of underwater operation, improves the efficiency of steel hanging box construction, and reduces the construction difficulty and cost. However, this construction method also has some problems. This construction method is mainly used for operations in shallow water areas, and the construction operation without bottom concrete is not applicable to steel hanging box operations in deep water areas. The water flow in deep water areas is complex, which can easily cause the steel box to be lowered inaccurately and the bottom plate to be in deep water areas, resulting in the risk of the cofferdam tilting, shifting or even overturning, which seriously threatens the safety of construction personnel and equipment. In addition, when the bottom plate of the steel box is located in the deep water area, the bottom concrete pouring construction is difficult, and the installation of the steel box is difficult, which greatly increases the labor cost. Summary of the invention

[0003] The purpose of this application is to solve the shortcomings of the above-mentioned background technology and provide a method for lowering a bottom steel hanging box and a steel hanging box suitable for deep waters.

[0004] The technical solution of the present application is: a method for lowering a bottomed steel hanging box in a deep-water area, comprising:

[0005] Prefabricate the steel box and the base plate in the factory, lay the airbag on the base plate, and install the base plate on the steel box;

[0006] Clean and level the bottom of the water in the area where the steel hanging box is lowered;

[0007] Transport the steel hoisting box to the lowering area, and hoist the steel hoisting box along the steel casing to the designed elevation;

[0008] Use the airbag on the bottom plate and the lifting equipment to lower the steel box so that it lands smoothly;

[0009] Use airbags to seal the gap between the bottom plate and the steel casing;

[0010] Pour the bottom concrete in the steel hanging box to complete the foundation construction.

[0011] According to a method for lowering a bottomed steel box in deep waters provided in the present application, the method for laying airbags on the bottom plate includes: laying bottom airbags at positions on the bottom of the bottom plate where no holes are provided, and laying gap airbags on the inner sides of holes on the bottom plate corresponding to steel casings.

[0012] According to a method for lowering a bottomed steel box in deep waters, provided in the present application, the bottom airbags include a plurality of first airbags arranged at intervals along the transverse direction and second airbags arranged at intervals along the longitudinal direction; the first airbags are long strip airbags located between two adjacent rows of steel casings in the transverse direction; the second airbags are block-shaped airbags located at the corners at both ends of a row of steel casings in the longitudinal direction.

[0013] According to a method for overall lowering of a bottomed steel box in deep waters provided in the present application, the method for cleaning and leveling the bottom of the steel box lowering area comprises: the method for cleaning and leveling the bottom of the steel box lowering area comprises: extending the lower end of the sludge suction pipe of the sludge suction equipment into the silt in the steel box lowering area, and using the sludge suction pipe to suck and desilt the silt in the steel box lowering area; using a leveling ship to level the silt in the steel box lowering area after dredging, so that the silt height in the steel box lowering area is a set distance below the design elevation for steel box lowering.

[0014] According to a method for lowering a bottomed steel hanging box in deep waters provided in the present application, the set distance is 1m to 2m.

[0015] According to the present application, a method for lowering a steel box with a bottom in deep waters is provided. The method of lowering the steel box by using the airbag on the bottom plate in cooperation with the lifting equipment so that the steel box can land smoothly includes: inflating the bottom airbag to expand the bottom airbag until the bottom airbag lands, so that the bottom airbag stably supports the steel box at the designed elevation.

[0016] According to a method for overall lowering of a bottomed steel hanging box in deep waters provided in the present application, the method for sealing the gap between the bottom plate and the steel casing using an air bag comprises: inflating the gap air bag to expand the gap air bag to seal the gap between the bottom plate and the steel casing.

[0017] According to the present application, a method for overall lowering of a bottomed steel box in deep waters is provided, and the method for pouring bottom sealing concrete in the steel box includes: after the gap between the bottom plate and the steel casing is completely blocked, concrete is poured onto the bottom of the steel box to seal the bottom, and after the concrete strength reaches the design requirements, the water in the steel box is pumped out to form a dry construction environment, the excess steel casing is cut off, the pile head is processed, the top surface of the concrete at the bottom of the steel box is roughened, the base reinforcement is installed, and the bottom sealing concrete is poured.

[0018] The present application also relates to a steel hanging box, which is constructed by using any of the above-mentioned methods for lowering a bottomed steel hanging box in deep waters, including:

[0019] The hanging box body is a hollow annular box structure with openings at the upper and lower ends;

[0020] A bottom plate, which is installed at the lower end of the hanging box body and has a plurality of holes corresponding to the steel casing inside the lowered steel hanging box;

[0021] The airbag is arranged at the bottom of the base plate and is used to control the lowering of the hanging box body and to seal the gap between the base plate and the steel casing.

[0022] According to a steel hanging box provided by the present application, the airbag comprises:

[0023] Bottom airbags, the bottom airbags include a plurality of first airbags arranged at intervals in the transverse direction and second airbags arranged at intervals in the longitudinal direction; the first airbags are long strip airbags located between two adjacent rows of steel casings in the transverse direction; the second airbags are block airbags located at the corners of both ends of a row of steel casings in the longitudinal direction;

[0024] The gap airbag is an annular airbag installed in the hole and surrounding the outside of the steel casing.

[0025] The advantages of the present application are as follows: 1. The steel hanging box lowering construction method of the present application is extremely safe. By prefabricating, processing and assembling on land, the difficulty and high risk of assembling the steel hanging box on the sea surface are avoided. The airbag is used to control the lowering, supporting and blocking of the steel hanging box, which greatly reduces the construction difficulty, realizes the smooth lowering and positioning of the steel hanging box, and avoids the safety risks such as sliding and overturning that may occur in the traditional launching method; the entire lowering construction process has a short cycle and high construction efficiency. There is no need to install the bottom plate separately at the steel casing. It only takes half a day to transport, hoist and lower a set of steel hanging boxes, which effectively improves the construction efficiency; the steel hanging box can be disassembled, recycled, and saves materials, effectively reducing costs and having better engineering economy; the airbag material can be reused, meeting the requirements of environmental protection and energy saving;

[0026] 2. This application lays a variety of airbag structures on the bottom plate, including bottom airbags for lowering and supporting the steel hanging box, and gap airbags for blocking the gap between the bottom plate and the steel casing. Different airbags have different effects, greatly improving the efficiency and safety of the steel hanging box lowering construction;

[0027] 3. The present application evenly arranges the first airbag and the second airbag at the bottom of the base plate, and the first airbag and the second airbag fully fill the base plate between the steel casings. The subsequent inflation and exhaust operations of the first airbag and the second airbag can evenly control the lowering of the steel hanging box and the support after the steel hanging box is lowered to the designed elevation. The overall operation is simple, the lowering of the steel hanging box is stable, and the construction efficiency is greatly improved.

[0028] 4. Before lowering the steel box, the present application uses mud suction equipment and leveling equipment to level the bottom of the water, so that the lowering area of ​​the steel box forms a flat lowering plane, providing stable support for the subsequent airbag landing on the bottom plate of the steel box, so that the steel box can be stably supported at the designed elevation position, thereby improving the stability and safety of the steel box construction;

[0029] 5. This application leaves a set distance between the bottom surface of the underwater leveling and the design elevation of the steel hanging box, so that the steel hanging box can be supported by the expansion of the bottom airbag in the future. The set distance leaves space for the expansion of the bottom airbag, which is convenient for the expansion and adjustment of the bottom airbag, ensuring that the steel hanging box can be stably supported. The steel hanging box is stably fixed at the design elevation without the need to be fixed to the design elevation by welding or other fixing methods. The operation is simple and the operation process is greatly reduced.

[0030] 6. This application is to inflate the bottom airbag so that the bottom airbag expands to support the steel hanging box, so that the steel hanging box can be stably supported at the designed elevation position, without welding the steel hanging box to the steel casing. The operation is simple, the process is few, and it is easy to control, which greatly improves the construction efficiency and construction safety;

[0031] 7. The present invention is very simple in sealing the gap between the steel casing and the bottom plate. The gap can be sealed by inflating the gap airbag without any other operation. The sealing is simple and has good adaptability, and can adapt to gaps of various structures and sizes.

[0032] 8. The present application has a very simple method for pouring the bottom seal concrete of the steel hanging box. First, the underwater concrete is poured to completely seal the bottom of the steel hanging box. Then, water is pumped out to form a dry construction environment to pour the bottom seal concrete of the pedestal. The overall construction is simple and easy to operate.

[0033] 9. The present application also provides a steel hanging box. The steel hanging box of the present application has a simple structure and can be applied to the construction of caps in deep water areas to greatly improve the safety and stability of the construction. The construction efficiency is extremely high and the construction difficulty is low.

[0034] 10. The present application sets up a variety of airbag structures on the base plate, each with a different function, which can support the steel hanging box and seal the gap between the steel casing and the base plate. The structure is simple, and installation, arrangement and disassembly are very convenient.

[0035] The steel box lowering construction method of the present application is suitable for deep-water areas and has the advantages of high construction safety and short construction period. The overall lowering construction process is greatly reduced, which improves the efficiency of the steel box lowering construction in deep-water areas. The steel box can be disassembled, recycled, and saves materials, which effectively reduces costs and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 : Bottom view of the steel hanging box of the present application;

[0037] Figure 2 : Schematic diagram of mud suction and leveling operation during the lowering construction of the steel hanging box of the present application;

[0038] Figure 3 : Schematic diagram of the lowering operation during the lowering construction process of the steel hanging box of this application;

[0039] Figure 4 : Schematic diagram of the bottom airbag opening operation during the steel hanging box lowering construction process of the present application;

[0040] Figure 5 : Schematic diagram of the gap airbag opening operation during the steel hanging box lowering construction process of the present application;

[0041] Figure 6 : Schematic diagram of concrete pouring operation during the lowering construction process of the steel hanging box of this application;

[0042] Among them: 1 - hanging box body; 2 - bottom plate; 3 - gap airbag; 4 - first airbag; 5 - second airbag. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0044] In the description of the present application, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0047] The present application relates to a method for lowering a bottomed steel box in a deep-water area. The steel box of the present application is equipped with an airbag structure, which is used to lower the steel box in cooperation with the lifting equipment. A part of the airbag structure can support the steel box after it is lowered to the designed elevation. The steel box does not need to be fixedly connected to the steel casing in other ways. The steel box can be stably fixed at the designed elevation, which greatly improves the efficiency and safety of the steel box lowering construction and reduces the process of the steel box lowering construction. Another part of the airbag structure can block the gap between the bottom plate and the steel casing. Using the airbag structure to block the gap is simpler to operate and more convenient to construct than other blocking methods. The airbag structure can adapt to various structures and sizes, and the scope of application is greatly improved.

[0048] like Figures 1 to 6As shown, the steel hanging box of the present application includes a hanging box body, a bottom plate and an airbag. The hanging box body is a hollow annular box structure with openings at both ends. The hanging box body is a box-shaped structure formed by side walls and internal beams. The bottom plate is installed at the lower end of the hanging box body. A plurality of holes corresponding to the steel casing inside the steel hanging box after lowering are opened on the bottom plate. The hanging box body is constructed with a plurality of steel casings in the lowering area before lowering. In order to facilitate the lowering of the steel hanging box, a hole corresponding to each steel casing is opened on the bottom plate. The holes are aligned with the steel casings one by one before the steel hanging box is lowered, and then the whole is lowered so that the steel casings pass through the corresponding holes. The airbag is arranged at the bottom of the bottom plate to control the lowering of the hanging box body and to block the gap between the bottom plate and the steel casing. The airbag structure of the present application is functionally divided into two types, one is a supporting airbag structure that supports the hanging box body after the hanging box body is lowered to the design elevation position, and the other is a blocking airbag structure that blocks the gap between the steel casing and the bottom plate.

[0049] When the steel hanging box of this application is actually lowered, the following steps can be followed:

[0050] S1, prefabricate a steel hanging box and a bottom plate 2 in a factory, lay an air bag on the bottom plate 2, and install the bottom plate 2 on the steel hanging box;

[0051] The steel hanging box of the present application is prefabricated in a factory. The hanging box body 1, the bottom plate 2 and the airbag structure prefabricated in the factory are assembled on land to form the required steel hanging box, and then transported as a whole to the water area to be lowered, so as to avoid the difficulty and high risk of assembly on the water surface;

[0052] S2. Clean and level the bottom of the water in the area where the steel hanging box is lowered;

[0053] By leveling the bottom of the lowered water area, it is convenient to support the steel hanging box after the steel hanging box is lowered into place. The stability of the steel hanging box has been greatly improved, and the safety of construction has also been greatly improved.

[0054] S3, transport the steel hoisting box to the lowering area, and hoist the steel hoisting box along the steel casing to the designed elevation;

[0055] S4, using the airbag on the bottom plate 2 to cooperate with the lifting equipment to lower the steel hanging box so that the steel hanging box lands smoothly;

[0056] The airbag structure on the bottom plate 2 can support the steel hanging box after it is lowered to the designed elevation, so that the steel hanging box is stably fixed at the designed elevation, which is convenient for subsequent operations. Because the airbag structure is used for support, the adjustment of the airbag structure is more convenient, and the steel hanging box does not need to be welded or fixedly connected to the steel casing in other ways, which greatly reduces the construction process of lowering the steel hanging box;

[0057] S5, using the airbag to seal the gap between the bottom plate 2 and the steel casing;

[0058] The airbag structure blocks the gap, and the blocking method is very simple. The airbag can be well blocked by inflating the airbag. The expansion range of the airbag can adapt to gaps of different structures and gaps of different sizes. It has an excellent scope of application and an excellent blocking effect.

[0059] S6. Pour the bottom concrete in the steel hanging box to complete the foundation construction.

[0060] In some embodiments of the present application, the present embodiment optimizes the above-mentioned airbag structure, specifically, Figure 1 As shown, the airbags of this embodiment include bottom airbags and gap airbags 3, wherein the bottom airbags include a plurality of first airbags 4 arranged at intervals in the transverse direction and second airbags 5 arranged at intervals in the longitudinal direction; the first airbag 4 is a long strip airbag between two adjacent rows of steel casings in the transverse direction; the second airbag 5 is a block airbag at the corners at both ends of a row of steel casings in the longitudinal direction. The function of the bottom airbag is to support the steel hanging box so that the steel hanging box can be stably implanted. The bottom airbag is evenly filled on the bottom plate 2 and arranged by making full use of the gap position on the bottom plate 2. The first airbag 4 is a long strip structure distributed between two adjacent rows of steel casings. The steel casings of this application are distributed in an array mode. For the corner positions with relatively large gaps between the hanging box body 1 and the steel casing, that is, the corners at both ends of a row of steel casings in the longitudinal direction, the second airbag 5 is arranged. The first airbag 4 and the second airbag 5 are fully distributed on the bottom plate 2. Finally, when the bottom plate 2 is supported, the stability of the bottom plate 2 and the entire steel hanging box can be ensured to avoid the problem of overturning.

[0061] The gap airbag 3 is an annular airbag installed in the hole and surrounding the outside of the steel casing. The gap airbag 3 is an annular airbag structure, which is sleeved on the outside of the steel casing. When the gap airbag 3 is inflated and expanded, it can fully fill the gap between the steel casing and the bottom plate 2, and block the gap between the bottom plate 2 and the steel casing. By adjusting the expansion amplitude of the gap airbag 3, it can adapt to gaps of different structures and sizes. In the process of lowering the steel hanging box, it is certainly impossible to ensure that each hole is concentric with the steel casing passing through the hole. The gap airbag 3 is used to block the gap. The gap airbag 3 itself is a flexible structure, which can be adapted according to the structure and size of the gap. The overall operation is very simple, and when the gap is blocked, the gap is below the water surface. The blocking of the gap airbag 3 can avoid underwater operations and improve the safety of the entire construction.

[0062] When the airbag is actually laid, the bottom airbag is laid at a position where no hole is formed at the bottom of the bottom plate 2, and the gap airbag 3 is laid inside the hole formed in the bottom plate 2 corresponding to the steel casing.

[0063] In other embodiments of the present application, the present embodiment optimizes the above-mentioned step S2, and the method for cleaning and leveling the bottom of the steel box lowering area is: using the sludge suction equipment on the ship to dredge the bottom of the area to be lowered, extending the lower end of the sludge suction pipe of the sludge suction equipment into the silt in the steel box lowering area, and using the sludge suction pipe to suck and dredge the silt in the steel box lowering area; using a leveling ship to level the steel box lowering area after dredging, so that the silt height in the steel box lowering area is a set distance below the design elevation of the steel box lowering. The set distance is 1m to 2m, and preferably 1.5m can be selected.

[0064] The mud suction and leveling operation can be completed before the steel hanging box enters the construction area to be lowered, or it can be performed after the steel hanging box enters the construction area to be lowered. If the operation is performed after the steel hanging box enters the construction area to be lowered, the mud suction pipe of the mud suction equipment can be extended through the hole on the bottom plate 2 to the mud surface to perform mud suction operations, and the mud suction and leveling operations are performed on the corresponding parts of each hole in turn, so that the mud suction and leveling operations can be completed fully and evenly. Because the holes on the bottom plate 2 correspond to the steel casing, the holes on the bottom plate 2 are evenly distributed. Through this operation method, the holes can be used as a guide structure to constrain the mud suction pipe, which is convenient for the mud suction operation. You can refer to Figure 2 shown.

[0065] The purpose of dredging and leveling the bottom of the water is to make the bottom of the area to be lowered flat, so as to facilitate the subsequent stable landing of the steel hanging box. At the same time, expansion space for the bottom airbag flows out between the bottom of the water and the bottom plate 2 of the steel hanging box. After the steel hanging box is lowered into place, the steel hanging box can be supported by the expansion of the bottom airbag.

[0066] The flat bottom surface can make the support of the steel hanging box more stable, avoiding problems such as overturning and shaking.

[0067] In a further embodiment of the present application, this embodiment optimizes the above-mentioned step S4. Specifically, the method of using the airbag on the bottom plate 2 to cooperate with the lifting equipment to lower the steel hanging box so that the steel hanging box can land smoothly is as follows: after the steel hanging box is transported to the water area to be lowered, it is lifted by the lifting equipment on the ship. The lifting equipment lifts the steel hanging box and slowly descends it, so that the holes on the steel casing and the bottom plate 2 are aligned one by one until the steel casing passes through the corresponding holes one by one. After the steel hanging box is lowered to the designed elevation position, there is a certain distance between the bottom plate 2 and the leveled bottom surface, that is, the set distance mentioned above, and then the bottom airbag is inflated to expand the bottom airbag until the bottom airbag lands, so that the bottom airbag stably supports the steel hanging box at the designed elevation.

[0068] Finally, the steel box is supported by the bottom airbag, which provides vertical and stable support for the steel box. The steel casing limits the horizontal displacement of the steel box. At this time, the steel box is restricted in this position. After the steel box is completely stable, the hoisting equipment can be unhooked.

[0069] In other embodiments of the present application, this embodiment optimizes the above-mentioned step S5, and inflates the gap airbag 3 to expand the gap airbag 3 to seal the gap between the bottom plate 2 and the steel casing.

[0070] The gap airbag 3 is an annular airbag. Before the steel hanging box is lowered, the gap airbag 3 is in an unopened closed state. The gap airbag 3 is contracted, which can avoid friction and collision between the gap airbag 3 and the steel casing, and facilitate the lowering of the steel hanging box. After the steel hanging box is lowered to the designed elevation and the support of the steel hanging box is completed, the gap airbag 3 can be inflated to expand the gap airbag 3. The expanded gap airbag 3 can conveniently block the gap between the steel casing and the bottom plate 2. At this time, the inside and outside of the steel hanging box are isolated.

[0071] In a preferred embodiment of the present application, this embodiment optimizes the above-mentioned step S6. Specifically, the method of pouring bottom sealing concrete in the steel hanging box is as follows: after the gap between the bottom plate 2 and the steel casing is completely blocked, pour concrete on the bottom of the steel hanging box to seal the bottom. After the concrete strength reaches the design requirement, that is, the strength of the poured underwater concrete reaches 90%, it is considered that the underwater concrete at this time can completely seal the bottom of the steel hanging box. At this time, the inside and outside of the steel hanging box are completely isolated, the water in the steel hanging box is pumped out to form a dry construction environment, the excess steel casing is cut off, the pile head is processed, the top surface of the concrete at the bottom of the steel hanging box is roughened, the base steel bars are installed, and the bottom sealing concrete is poured.

[0072] The present application is applicable to the actual operation of the method for lowering the bottom steel hanging box in deep waters, such as Figures 2 to 6As shown, a steel hanging box and a bottom plate 2 are prefabricated in a factory, a bottom air bag is laid at a position where no hole is provided at the bottom of the bottom plate 2, a gap air bag 3 is laid on the inner side of a hole corresponding to the steel casing provided in the bottom plate 2, and the bottom plate 2 is installed on the steel hanging box; the bottom of the water in the area to be lowered is dredged by the sludge suction equipment on the ship, the lower end of the sludge suction pipe of the sludge suction equipment is extended into the silt in the steel hanging box lowering area, the silt in the steel hanging box lowering area is sucked and dredged by the sludge suction pipe, and the silt in the steel hanging box lowering area is leveled by a leveling ship, so that the silt height in the steel hanging box lowering area is a set distance below the design elevation of the steel hanging box lowering; the steel hanging box is transported to the lowering area, and is lifted by the lifting equipment on the ship, and the lifting equipment lifts the steel hanging box and slowly descends, so that the steel The holes on the casing and the base plate 2 are aligned one by one, and the steel casings pass through the corresponding holes one by one until the steel hanging box is lowered to the designed elevation; the bottom airbag is inflated to expand the bottom airbag until the bottom airbag lands, so that the bottom airbag stably supports the steel hanging box at the designed elevation; the gap airbag 3 is inflated to expand the gap airbag 3 to seal the gap between the base plate 2 and the steel casing; after the gap between the base plate 2 and the steel casing is completely blocked, concrete is poured at the bottom of the steel hanging box to seal the bottom, and after the concrete strength reaches 90%, the water in the steel hanging box is pumped out to form a dry construction environment, the excess steel casing is cut off, the pile head is processed, the top surface of the concrete at the bottom of the steel hanging box is roughened, the base steel bars are installed, and the bottom sealing concrete is poured; the steel hanging box lowering construction is completed.

[0073] After the foundation is completely formed, the steel hanging box can be removed, and the hanging box body 1, the bottom plate 2 and the airbag structure can be removed together.

[0074] like Figure 1 As shown, the horizontal direction of this application Figure 1 The left and right directions in this application refer to the longitudinal direction. Figure 1 The vertical direction in this application refers to the up and down direction Figures 2 to 6 The up and down directions in .

[0075] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application to be protected. The scope of protection claimed in the present application is defined by the attached claims and their equivalents.

Claims

1. A method for lowering a bottomed steel hanging box in deep waters, characterized in that: include, Prefabricate a steel hanging box and a bottom plate (2) in a factory, lay an air bag on the bottom plate (2), and install the bottom plate (2) on the steel hanging box; Clean and level the bottom of the water in the area where the steel hanging box is lowered; Transport the steel hoisting box to the lowering area, and hoist the steel hoisting box along the steel casing to the designed elevation; The steel hanging box is lowered by using the airbag on the bottom plate (2) in cooperation with the lifting equipment so that the steel hanging box lands smoothly; Using an air bag to seal the gap between the bottom plate (2) and the steel casing; Pour the bottom concrete in the steel hanging box to complete the foundation construction.

2. A method for lowering a bottomed steel hanging box as described in claim 1, characterized in that: The method for laying an airbag on a bottom plate (2) comprises: laying a bottom airbag at a position where no hole is provided at the bottom of the bottom plate (2), and laying a gap airbag (3) inside a hole provided in the bottom plate (2) corresponding to a steel casing.

3. A method for lowering a bottomed steel hanging box as described in claim 2, which is applicable to deep waters, characterized in that: The bottom airbags include a plurality of first airbags (4) arranged at intervals in the transverse direction and second airbags (5) arranged at intervals in the longitudinal direction; the first airbags (4) are long strip airbags located between two adjacent rows of steel casings in the transverse direction; the second airbags (5) are block airbags located at the corners of both ends of a row of steel casings in the longitudinal direction.

4. A method for lowering a bottomed steel hanging box as described in claim 1, characterized in that: The method for cleaning and leveling the bottom of the steel box lowering area includes: extending the lower end of the sludge suction pipe of the sludge suction equipment into the silt in the steel box lowering area, and using the sludge suction pipe to suck and desilt the silt in the steel box lowering area; using a leveling ship to level the silt in the steel box lowering area after dredging, so that the silt height in the steel box lowering area is a set distance below the design elevation of the steel box lowering.

5. A method for lowering a bottomed steel hanging box as described in claim 4, which is applicable to deep waters, characterized in that: The set distance is 1m to 2m.

6. A method for lowering a bottomed steel hanging box as described in claim 2, which is applicable to deep waters, characterized in that: The method of using the airbag on the bottom plate (2) in conjunction with the lifting equipment to lower the steel hanging box so that the steel hanging box lands smoothly comprises: inflating the bottom airbag to expand the bottom airbag until the bottom airbag lands, so that the bottom airbag stably supports the steel hanging box at the designed elevation.

7. A method for lowering a bottomed steel hanging box as described in claim 2, which is applicable to deep waters, characterized in that: The method for sealing the gap between the bottom plate (2) and the steel casing by using an air bag comprises: inflating air into the gap air bag (3), so that the gap air bag (3) expands to seal the gap between the bottom plate (2) and the steel casing.

8. The method for lowering a bottomed steel hanging box in a deep-water area as claimed in claim 1, characterized in that: The method for pouring bottom sealing concrete in a steel hanging box comprises: after the gap between the bottom plate (2) and the steel casing is completely blocked, pouring concrete to the bottom of the steel hanging box to seal the bottom; after the concrete strength reaches the design requirement, pumping out the water in the steel hanging box to form a dry construction environment, cutting off the excess steel casing, performing pile head treatment, roughening the top surface of the concrete at the bottom of the steel hanging box, installing the foundation steel bars, and pouring the bottom sealing concrete.

9. A steel hanging box, characterized in that: The steel hanging box is constructed by using any one of the methods for lowering a bottomed steel hanging box in deep waters as described in claims 1 to 8. include, A hanging box body (1), the hanging box body (1) is a hollow annular box structure with openings at both ends; A bottom plate (2), the bottom plate (2) being mounted on the lower end of the hanging box body (1), and having a plurality of holes corresponding to the steel casing inside the lowered steel hanging box; An airbag is arranged at the bottom of the base plate (2) and is used to control the lowering of the hanging box body (1) and to seal the gap between the base plate (2) and the steel casing.

10. A steel hanging box as claimed in claim 9, characterized in that: The airbag comprises: A bottom airbag, the bottom airbag comprising a plurality of first airbags (4) arranged at intervals in the transverse direction and second airbags (5) arranged at intervals in the longitudinal direction; the first airbag (4) is a long strip airbag located between two adjacent rows of steel casings in the transverse direction; the second airbag (5) is a block airbag located at the corners of both ends of a row of steel casings in the longitudinal direction; The gap airbag (3) is an annular airbag installed in the hole and surrounding the outside of the steel casing.

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