A method for in-situ removal of obsolete and ineffective floating dock doors

Abstract

The present invention relates to the field of floating dock gates, and specifically discloses a method for in-situ dismantling of obsolete and invalid floating dock gates, including: model measurement and scheme formulation, water retaining system establishment, construction platform preparation, construction environment optimization, horizontal plate dismantling, side plate dismantling, plate transfer and other construction processes. This process is combined with the construction of a water-stopping system in the dock area to achieve water pumping in the dock area to form a dry construction environment. The dock gate is pre-cut in sections according to actual working conditions, and the cutting design is carried out in the order of horizontal plates, side plates, longitudinal beams and transverse beams. For larger longitudinal beams, the entire floating dock gate is pre-cut in sections, and the crane is used to lift the steel plates layer by layer and piece by piece. For smaller longitudinal beams, the crane is used to lift the steel plates vertically and horizontally, retaining key connection parts to ensure stability, achieving smooth cutting, transfer and disassembly, avoiding the difficulty and risk factor of underwater cutting, and at the same time, the difficulty of lifting the steel plates layer by layer and piece by piece is relatively low.

Description

Technical Field

[0001] The invention relates to the field of floating dock doors, in particular to an in-situ dismantling method for obsolete and ineffective floating dock doors. Background Art

[0002] The removal of floating dock gates is an important part of dock projects and a key link in port transformation and functional optimization. With the rapid development of the global marine economy and the increasing demand for modernization of port facilities, a large number of old docks have been gradually abandoned due to backward technical standards, high maintenance costs or incompatibility with modern port functional requirements. The removal of floating dock gates, as the core structure connecting the dock and the external waters, not only directly affects the functional release of the dock, but also affects the smooth progress of subsequent construction and the effective restoration of the ecological environment. Due to their special structural design, the possibility of reuse of old floating dock gates is extremely low. Traditional demolition methods are limited by the water environment, failure of sealed air chambers and failure of drainage systems, making it difficult to float the floating dock gates and transfer them to a dry environment for treatment.

[0003] However, the traditional method of dismantling a floating dock gate is to dismantle the floating dock gate as a whole and then cut it into pieces by underwater cutting. The construction cost of underwater cutting is high and the safety risk is great. Summary of the Invention

[0004] In view of the existing problems, the present invention provides an in-situ dismantling method for obsolete and invalid floating dock doors. The device can be used in conjunction with other methods to effectively solve the problems raised in the background technology.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] A method for in-situ dismantling of a waste and invalid floating dock door, the process comprising the following steps:

[0007] S1: Model measurement and solution development

[0008] Conduct on-site measurements and model calculations on the floating dock gate to determine the center of gravity and force distribution. Implement simple reinforcement measures for areas that deviate from the foundation or have insufficient support, such as adding steel supports and welding stiffeners, to ensure overall stability during the demolition process.

[0009] S2: Establishment of water retaining system

[0010] A water retaining cofferdam is built at the dock entrance to form a water retaining system, forming a closed water isolation area outside the dock entrance, and using pumping equipment to drain the water from the water retaining cofferdam and the dock entrance;

[0011] S3: Construction platform preparation

[0012] Ensure worker safety and work quality throughout the entire pre-construction and construction process by adding construction platforms (such as wooden springboards or walkways) at different locations on the dock and installing safety ropes at guardrails;

[0013] S4: Construction environment optimization

[0014] Before construction, the interior of the floating dock door is ventilated with a blower to detect and remove flammable, explosive or toxic gases to ensure construction safety.

[0015] S5: Horizontal plate removal

[0016] Mark and pre-cut according to the stress state of the horizontal plate on the top of the floating dock door;

[0017] S6: Side panel removal

[0018] Based on the internal structure of the floating dock door, the cutting design is carried out by taking advantage of the supporting effect of the longitudinal beams and transverse beams on the side plates. For larger longitudinal beams, the longitudinal beams are used as the support base point to pre-cut the side plates in different areas. For smaller longitudinal beams, the steel plates are cut vertically and horizontally based on the crane's lifting capacity, and key connection points are retained to ensure stability.

[0019] S7: Plate transfer

[0020] After pre-cutting, the floating dock door components are hoisted layer by layer and piece by piece using lifting equipment. During the hoisting process, the lifting point position and hoisting speed must be strictly controlled to ensure the smooth transfer and disassembly of each structure.

[0021] As a further solution of the present invention: in step S2, the water retaining cofferdam is staggered with double rows of steel plates to avoid water seepage at the joints, create a dry construction environment, and prevent water from seeping into the construction process and affecting the operation.

[0022] As a further solution of the present invention: in the step S1, the cross-sectional structure of the floating dock door is a rectangular lower part and a trapezoidal upper part, and the center of gravity is evenly distributed. The floating dock door is divided into three parts in the longitudinal direction according to the ratio of 2:1:2, and a 3D model is established to formulate a cutting plan.

[0023] As a further solution of the present invention: in the step S5, the horizontal plate is marked and pre-cut by mechanical calculation. In this process, some uncut steel plates are reserved (i.e., staggered cutting). The reserved steel plates are used to bear the weight of the horizontal plate and the construction workers to maintain the stability of the structure. After the pre-cutting of the entire horizontal plate is completed, the horizontal plate is suspended by a car crane to cut the reserved seams. Finally, the workers who perform the cutting stand on an additional working platform (such as a wooden springboard that can bear the weight of the workers) to complete the dismantling of the horizontal plate piece by piece.

[0024] As a further solution of the present invention: in the step S6, after the horizontal plate is cut, a channel leaking out after the horizontal plate is cut is set to enter the first layer of the floating dock door, and observe and confirm whether there are longitudinal and transverse reinforced steel beams inside the floating dock door. When encountering larger longitudinal beams (the judgment criteria for the size of the longitudinal beams are mainly based on the lifting capacity of the crane used and economic analysis), the supporting effect of the longitudinal reinforced steel beams on the stability of the side plates is fully utilized when cutting the side plates, a worker working platform (such as scaffolding) is built at the side wall position, and the steel plates and some cross beams are pre-marked and pre-cut according to mechanical calculations to ensure the stability of the structure during the cutting process.

[0025] As a further solution of the present invention: in step S6, when encountering a smaller longitudinal beam, the steel plate is pre-cut vertically and horizontally. During the cutting process, the connection integrity between the longitudinal beam and the outer steel plate is retained to ensure the structural stability and integrity of the side plate before removal.

[0026] As a further solution of the present invention: in the step S2, before the dock is lowered, the floating dock door is tied to the embedded parts of the dock by installing an I-beam on the top to prevent the floating dock door from shifting during the lowering process. At the same time, monitoring is carried out for several days to ensure the stability of the floating dock door's position. After the water is pumped out, a diagonal tie is set at the bottom of the floating dock door to ensure its stability.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. This process combines the construction of a water-stop system in the dock area to achieve water pumping in the dock area to create a dry construction environment. The dock gate is pre-cut in sections according to actual working conditions, and the cutting design is carried out in the order of horizontal plates, side plates, longitudinal beams and cross beams. In the case of large longitudinal beams, the entire floating dock gate is pre-cut in sections, and the crane is used to lift the dock gate layer by layer, piece by piece, to achieve smooth cutting, transfer and disassembly, avoiding the difficulty and risk factor of underwater cutting. At the same time, the difficulty of lifting the dock gate layer by layer is relatively low.

[0029] 2. Dry operation is achieved through the implementation of water-stop structure, without moving the failed dock door, avoiding underwater cutting operation and reducing operation risks; making full use of the dock door structure itself to form working conditions, without the need to set up large platforms such as full-floor scaffolding and use aerial platforms, etc., and achieving higher cutting efficiency.

[0030] 3. The water retaining cofferdam adopts double rows of steel plates for staggered layout to avoid water seepage at the joints and create a dry construction environment to avoid water seepage during construction and affect the operation, thereby improving the efficiency of the entire cutting process.

[0031] 4. The cutting adopts the staggered cutting method. The reserved steel plate is used to bear the weight of the horizontal plate and the construction workers to maintain the stability of the structure. After completing the pre-cutting of the entire horizontal plate, the horizontal plate is suspended by a car crane to cut the reserved seam. Finally, the workers who perform the cutting stand on the additional springboard to cut the remaining plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A structural diagram of an in-situ dismantling method for obsolete and ineffective floating dock doors;

[0033] Figure 2 The figure is a structural diagram of a floating dock door in a method for in-situ removal of an obsolete and invalid floating dock door;

[0034] Figure 3 A longitudinal cross-sectional view of a floating dock door in a method for in-situ dismantling of an obsolete and ineffective floating dock door;

[0035] Figure 4 This is a transverse cross-sectional view of a floating dock during a method for in-situ dismantling of an obsolete and invalid floating dock.

[0036] In the picture: 1. Floating dock door; 2. Water retaining cofferdam; 3. Guardrail; 4. Gangway; 5. Safety rope; 6. Hatch door; 7. Blower; 8. I-beam. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with specific inventions, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] In the description of this specification, the reference terms "this embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example, and the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0039] like Figure 1-4 As shown, this embodiment provides a method for in-situ removal of a waste and invalid floating dock door, which specifically includes the following steps:

[0040] S1: Model measurement and solution development

[0041] Conduct on-site measurements and model calculations on the floating dock gate 1 to determine the center of gravity and force distribution of the floating dock gate 1. Implement simple reinforcement measures for areas that deviate from the foundation or have insufficient support, such as adding steel supports and welding stiffening plates, to ensure overall stability during the demolition process.

[0042] S2: Establishment of water retaining system

[0043] A water retaining cofferdam 2 is constructed at the location of the floating dock gate 1 to form a water retaining system, forming a closed water isolation area outside the floating dock gate 1, and using pumping equipment to drain the water in the water retaining cofferdam 2 and the floating dock gate 1;

[0044] S3: Construction platform preparation

[0045] To ensure the safety of workers and the quality of work before and during the entire construction process, construction platforms such as wooden gangplanks 4 or walkways are added at different locations of the floating dock door 1 and safety ropes 5 are installed at the guardrails 3;

[0046] S4: Construction environment optimization

[0047] Before construction, the interior of the floating dock door 1 is ventilated by using a blower 7 to ventilate the hatch 6 of the internal sealed air compartment to detect and remove flammable, explosive or toxic gases to ensure construction safety.

[0048] S5: Horizontal plate removal

[0049] Mark and pre-cut according to the stress state of the horizontal plate on the top of the floating dock door;

[0050] S6: Side panel removal

[0051] Based on the internal structure of the floating dock door 1, the cutting design is carried out by taking advantage of the supporting effect of the longitudinal beams and transverse beams on the side plates. In the case of large longitudinal beams, the longitudinal beams are used as the support base point to pre-cut the side plates in different areas. In the case of small longitudinal beams, the steel plates are cut vertically and horizontally based on the lifting capacity of the crane, and the key connection parts are retained to ensure stability.

[0052] S7: Plate transfer

[0053] After pre-cutting is completed, the floating dock door 1 components are hoisted layer by layer and piece by piece using lifting equipment. During the hoisting process, the lifting point position and hoisting speed must be strictly controlled to ensure the smooth transfer and disassembly of each structure.

[0054] like Figure 2-3As shown, in this embodiment, in step S2, the water retaining cofferdam 2 is staggered with double rows of steel plates to avoid water seepage at the joints, creating a dry construction environment to prevent water seepage from affecting the work during construction. In step S1, the cross-sectional structure of the floating dock door 1 is a rectangular lower part and a trapezoidal upper part, with a uniform center of gravity distribution. The floating dock door is divided into three parts in the longitudinal direction according to a ratio of 2:1:2. A 3D model is established to formulate a cutting plan. In step S5, the horizontal plate is marked and pre-cut by mechanical calculation. During this process, some uncut steel plates are reserved (i.e., staggered cutting). The reserved steel plates are used to bear the weight of the horizontal plate and the construction workers to maintain the stability of the structure. After the pre-cutting of the entire horizontal plate is completed, the horizontal plate is suspended by a mobile crane to cut the reserved seams. Finally, the workers who perform the cutting stand on an additional working platform (such as a wooden springboard that can bear the weight of the workers) to complete the removal of the horizontal plate piece by piece. In step S6, after the cutting of the horizontal plate is completed, a channel is set up for the leaked horizontal plate after cutting to enter Inside the first layer of the floating dock door 1, observe and confirm whether there are longitudinal and transverse reinforced steel beams inside the floating dock door 1. When encountering large longitudinal beams (the size of the longitudinal beams is mainly determined by the lifting capacity of the crane used and economic analysis), the longitudinal reinforced steel beams are fully utilized to support the stability of the side panels when cutting the side panels. A worker working platform (such as scaffolding) is built at the side wall position, and the steel plates and some cross beams are pre-marked and pre-cut according to mechanical calculations to ensure the stability of the structure during the cutting process. In step S6, When encountering smaller longitudinal beams, the steel plates are pre-cut vertically and horizontally. During the cutting process, the connection integrity between the longitudinal beams and the outer steel plates is retained to ensure the structural stability and integrity of the side plates before removal. In step S2, before the dock is lowered, the floating dock door is tied to the embedded parts of the dock by installing I-beams 8 on the top to avoid displacement of the floating dock door during the lowering process. At the same time, monitoring is carried out for several days to ensure the stability of the floating dock door position. After pumping is completed, a diagonal brace is set at the bottom of the floating dock door to ensure the stability of the floating dock door.

[0055] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0056] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0057] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for in-situ dismantling of obsolete and ineffective floating dock doors, characterized in that: The dismantling method comprises the following steps: S1: Model measurement and program development; Conduct on-site measurements and model calculations on the floating dock gate to determine the center of gravity and force distribution. Implement simple reinforcement measures for areas that deviate from the foundation or have insufficient support, such as adding steel supports and welding stiffeners, to ensure overall stability during the demolition process. S2: Establishment of water retaining system; A water retaining cofferdam is built at the dock entrance to form a water retaining system, forming a closed water isolation area outside the dock entrance, and using pumping equipment to drain the water from the water retaining cofferdam and the dock entrance; S3: Construction platform preparation; Ensure worker safety and work quality throughout the pre-construction and construction process by adding construction platforms at different locations of the dock and installing safety ropes at the guardrails; S4: Construction environment optimization; Before construction of the floating dock door, use a blower to ventilate the internal sealed air compartment to detect and remove flammable, explosive or toxic gases; S5: Horizontal plate removal Mark and pre-cut according to the stress state of the horizontal plate on the top of the floating dock door; S6: Side panel removal Based on the internal structure of the floating dock door, the cutting design is carried out by taking advantage of the supporting effect of the longitudinal beams and transverse beams on the side plates. For larger longitudinal beams, the longitudinal beams are used as the support base point to pre-cut the side plates in different areas. For smaller longitudinal beams, the steel plates are cut vertically and horizontally based on the crane's lifting capacity, and key connection points are retained to ensure stability. S7: Plate transfer After pre-cutting is completed, the floating dock door components are lifted layer by layer and piece by piece using lifting equipment. During the lifting process, the lifting point position and lifting speed must be strictly controlled to ensure the smooth transfer and disassembly of each structure.

2. The in-situ dismantling method of a waste and invalid floating dock door according to claim 1 is characterized in that: In step S2, the water retaining cofferdam is staggered with double rows of steel plates to avoid water seepage at the joints and create a dry construction environment.

3. The in-situ dismantling method of a waste and invalid floating dock door according to claim 1 is characterized in that: In step S1, the cross-section of the floating dock door is a rectangular lower portion and a trapezoidal upper portion, with a uniform center of gravity distribution. The floating dock door is divided into three parts longitudinally in a ratio of 2:1:2, and a 3D model is established to formulate a cutting plan.

4. The in-situ dismantling method of a waste and invalid floating dock door according to claim 1 is characterized in that: In step S5, the horizontal plate is marked and pre-cut by mechanical calculation. During this process, some uncut steel plates are reserved. The reserved steel plates are used to bear the weight of the horizontal plate and the construction workers to maintain the stability of the structure. After the pre-cutting of the entire horizontal plate is completed, the horizontal plate is suspended by a car crane to cut the reserved seams. Finally, the workers who perform the cutting stand on an additional working platform to complete the dismantling of the horizontal plate piece by piece.

5. The in-situ dismantling method of a waste and invalid floating dock door according to claim 1 is characterized in that: In step S6, after the horizontal plate is cut, a channel leaking out after the horizontal plate is cut is set to enter the first layer of the floating dock door, and observe and confirm whether there are longitudinal and transverse reinforced steel beams inside the floating dock door. When encountering larger longitudinal beams, the supporting effect of the longitudinal reinforced steel beams on the stability of the side plates is fully utilized when cutting the side plates. A worker working platform is built at the side wall position, and the steel plates and some cross beams are pre-marked and pre-cut according to mechanical calculations.

6. The in-situ dismantling method of a waste and invalid floating dock door according to claim 1 is characterized in that: In step S6, when a smaller longitudinal beam is encountered, the steel plate is pre-cut vertically and horizontally, and during the cutting process, the connection between the longitudinal beam and the outer steel plate is kept intact.

7. The in-situ dismantling method of a waste and invalid floating dock door according to claim 1 is characterized in that: In step S2, before the dock is lowered, the floating dock door is tied to the embedded parts of the dock by installing I-beams on the top to prevent the floating dock door from moving during the lowering process. At the same time, monitoring is carried out for several days to ensure the stability of the floating dock door's position. After pumping is completed, a diagonal tie is set at the bottom of the floating dock door.

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