Method for dismantling waste invalid horizontal dock gate

Abstract

The invention discloses a method for dismantling a waste invalid horizontal dock gate. The method comprises the following steps: S1, slinging in a dock gate pit area and analyzing the lowering stability of the dock gate; s2, construction of a water stop system; and S3, a dock gate dismantling process. According to the in-situ putting-down and dismantling process for the waste invalid horizontal dock gate, underwater cutting can be effectively avoided, the cutting efficiency is improved, and safety and economy are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic engineering, and in particular to a method for dismantling obsolete and ineffective horizontal dock doors. Background Art

[0002] The horizontal dock door is a structure that achieves watertightness through gravity or mechanical locking mechanism and is widely used for dock closure and water level regulation. However, with the large-scale ships and the diversified needs of port functions, many docks need to be upgraded or demolished, and the corresponding old horizontal dock doors are facing the need to be demolished or replaced. Especially for the demand for complete dock demolition, due to the long operation of the dock door and long-term exposure to seawater and climatic conditions, the steel structure of the dock door is affected by corrosion, fatigue and deformation, and its bearing capacity and watertightness cannot be guaranteed. It is difficult to transfer and float the dock door. Underwater demolition operations are greatly affected by the environment, such as low visibility and large changes in flow rate, which makes it difficult to control the demolition accuracy and increase the risk of accidents. Underwater cutting and salvage require special equipment and technical support, and the construction cost is high and the efficiency is low. Underwater cutting may cause pollutant diffusion, sediment disturbance, and even destroy the ecological balance of the water body.

[0003] Therefore, by controlling the dock door to fall down and dismantle in situ, the high-risk underwater dismantling can be transferred to land decomposition, significantly reducing the complexity and safety hazards of diving operations. After falling down, the section dismantling is carried out under dry land conditions to improve the dismantling accuracy while minimizing environmental disturbance. After falling down in situ, efficient scrap steel classification and recycling can be carried out to improve economic benefits and material utilization. This technology is flexibly adapted to projects of different scales and complexities and has broad application prospects. The smooth implementation of the dismantling of the lying dock door can also provide reference and reference for other similar projects.

[0004] Therefore, a method for dismantling an old and invalid horizontal dock door is provided. Summary of the invention

[0005] The purpose of the present invention is to overcome the existing defects and provide a method for dismantling old and disabled horizontal dock doors, which can effectively avoid underwater cutting and improve cutting efficiency, and is a safe and economical in-situ dismantling process for old and disabled horizontal dock doors.

[0006] The technical solution to achieve the above purpose is:

[0007] A method for dismantling a waste and ineffective horizontal dock door, comprising:

[0008] Step S1, sand dumping in the dock pit area and stability analysis of dock lowering;

[0009] Step S2, construction of a water stop system;

[0010] Step S3, dock door removal process.

[0011] Preferably, in step S1, the sand throwing in the dock pit area and the stability analysis of the dock lowering include:

[0012] Step S11, before the dock gate is lowered into the water, sand throwing is first performed in the dock gate pit area to form a stable sand slope in the dock gate pit;

[0013] Step S12, by accurately calculating and analyzing the relationship between the buoyancy provided by each air chamber of the dock door during the lowering process and the gravity of the dock door itself, until the dock door is lowered to the designated sand slope.

[0014] Preferably, in step S12, during the lowering process, the air retained in the cabin maintains the stability of the lowering of the dock door, so that it is slowly lowered at a controlled speed until it is safely docked in the dock door pit area with sand thrown in advance to form a sand slope.

[0015] Preferably, in step S2, a double-row steel sheet pile cofferdam water-stopping system is designed and constructed at the dock position to form a completely enclosed water-proof area, and the water inside the cofferdam is drained by configuring high-efficiency pumping equipment to create a dry working environment that meets the construction requirements.

[0016] Preferably, in step S3, the dock door removal process includes:

[0017] Step S31, dock door cutting platform and construction auxiliary measures;

[0018] Step S32, internal processing of the dock door;

[0019] Step S33, pre-cutting and removing the side panels after the dock door is laid down;

[0020] Step S34, cutting and removing the horizontal plate and rib plate after the dock door is laid down;

[0021] Step S35, lifting layer by layer and piece by piece.

[0022] Preferably, in step S31, the design of the cutting platform is calculated and verified by professional engineers, and auxiliary facilities are provided on the platform, including but not limited to a safety lifeline.

[0023] Preferably, in step S32, before the construction starts, the enclosed air compartment inside the dock door is fully ventilated by a blower, and at the same time, the compartment is strictly checked for the presence of flammable, explosive or toxic gases. If any abnormality is found, timely elimination measures are taken.

[0024] Preferably, in step S33, according to the stress state of the side plate after the dock door is laid down, the size and the position of the lifting point of the lifting steel plate are determined through precise calculation and verification by professional engineers; during the cutting process, a reasonable area of ​​the uncut steel plate is reserved; after the pre-cutting is completed, the horizontal plate is suspended and supported by a lifting equipment, and then the remaining slits are accurately cut.

[0025] Preferably, in step S34, the ribs are arranged perpendicular to the horizontal plates, and the size and lifting point positions of the lifting steel plates are determined based on the internal structure of the dock door after precise calculation and verification by professional engineers. The ribs are suspended and supported by lifting equipment, and vertical and horizontal cutting is performed to retain key connection parts, followed by precise cutting of the connection parts. After the rib cutting is completed, the horizontal plates are cut and lifted in the same way as the side plates.

[0026] Preferably, in step S35, after the pre-cutting work is completed, a lifting device is used to lift the dock door components layer by layer and piece by piece.

[0027] The beneficial effects of the present invention are as follows: the present invention calculates and analyzes the failed lying dock door, ensures that the dock door remains stable during the lowering process in the water, and ensures the stability of its structure during the removal process on the dock door pit sand pile; by establishing a water stop system, a dry construction environment is achieved to avoid underwater cutting operations, thereby effectively reducing the safety risks during the operation process; by utilizing the structural stability characteristics of the dock door after it is laid down, the removal height is reduced to form favorable working conditions, reduce dependence on large platforms, and significantly improve cutting efficiency; the present invention effectively fills the gap in the relevant technical field and provides an innovative solution for dock removal projects. . BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a flow chart of a method for dismantling a waste and invalid horizontal dock door according to the present invention;

[0029] Figure 2 It is a flow chart of the stability analysis of sand throwing in the dock pit area and dock lowering in the present invention;

[0030] Figure 3 It is a flow chart of the dock door removal process in the present invention;

[0031] Figure 4 Schematic diagram of sand throwing in a sand throwing bucket in a dock pit according to an embodiment of the present invention;

[0032] Figure 5 Schematic diagram of the sand slope of the dock gate pit in an embodiment of the present invention;

[0033] Figure 6 Schematic diagram of a dock gate being laid down to a sand slope of a dock gate pit in an embodiment of the present invention;

[0034] Figure 7 Schematic diagram of the gap under the dock door being partially filled with sand in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] like Figure 1 As shown, a method for dismantling a waste and invalid horizontal dock door comprises:

[0038] Step S1, sand dumping in the dock pit area and stability analysis of dock lowering.

[0039] like Figure 2 As shown in the figure, the stability analysis of sand dumping in the dock pit area and lowering of the dock gate includes:

[0040] Step S11, before the dock gate is lowered into the water, sand throwing construction is first carried out in the dock gate pit area to form a stable sand slope in the dock gate pit.

[0041] Step S12, by accurately calculating and analyzing the relationship between the buoyancy provided by each air chamber of the dock door during the lowering process and the dock door's own gravity, ensure that the dock door will not be at risk of sinking too quickly during the lowering process until the dock door is lowered to the designated sand slope. After the dock door is lowered to the designated sand slope, the sand slope provides the dock door with necessary and sufficient support surface, ensuring the overall stability and safety of the dock door in subsequent dismantling operations.

[0042] In the embodiment, during the lowering process, the air retained in the cabin maintains the stability of the lowering of the dock gate, so that it is slowly lowered at a controlled speed until it is safely docked in the dock gate pit area with sand thrown in advance to form a sand slope.

[0043] Step S2, construction of water-stopping system.

[0044] In the embodiment, a double-row steel sheet pile cofferdam water-stopping system is designed and constructed at the dock position to form a completely enclosed water-proof area. By configuring high-efficiency pumping equipment, the water inside the cofferdam is drained to create a dry working environment that meets the construction requirements. The design of the double-row steel sheet pile cofferdam water-stopping system must focus on ensuring its airtightness and structural stability to effectively prevent water leakage during construction, avoid adverse effects on construction progress and quality, and ensure the safety and reliability of operations.

[0045] Step S3, dock door removal process.

[0046] like Figure 3 As shown, the dock door removal process includes:

[0047] Step S31, dock door cutting platform and construction auxiliary measures.

[0048] In the embodiment, the design of the cutting platform is calculated and verified by professional engineers, and auxiliary facilities are set on the platform, including but not limited to safety life ropes, to ensure its stability and safety. By scientifically configuring the construction platform and auxiliary facilities, not only the construction safety factor is improved, but also the efficiency and accuracy of the demolition operation are effectively improved.

[0049] Step S32, internal processing of the dock door.

[0050] In the embodiment, before the construction begins, the enclosed air chamber inside the dock door is fully ventilated by a blower, and at the same time, the chamber is strictly checked for the presence of flammable, explosive or toxic gases. If any abnormality is found, timely elimination measures are taken to ensure that the environment inside the chamber meets the safety construction requirements and provide safety guarantees for subsequent operations.

[0051] Step S33, pre-cutting and removing the side panels after the dock door is folded down.

[0052] In the embodiment, according to the stress state of the side plate after the dock door is laid down, the size and lifting point position of the lifting steel plate are determined through precise calculation and verification by professional engineers; during the cutting process, a reasonable area of ​​uncut steel plates is reserved to ensure the stability of the overall structure; after the pre-cutting is completed, the horizontal plate is suspended and supported by a lifting equipment, and then the remaining cuts are accurately cut to ensure the safety of the demolition operation, structural stability and construction quality.

[0053] Step S34, cutting and removing the horizontal plates and ribs after the dock door is laid down.

[0054] In the embodiment, the rib plate is arranged perpendicular to the horizontal plate. According to the internal structure of the dock door, the size and lifting point position of the lifting steel plate are determined through precise calculation and verification by professional engineers. The rib plate is suspended and supported by a lifting device, and vertical and horizontal cutting is performed. The key connection parts are retained to ensure stability, and then precise cutting operations are performed on the connection parts. After the rib plate cutting is completed, the horizontal plate is cut and lifted in the same way as the side plate.

[0055] Step S35, lifting layer by layer and piece by piece.

[0056] In the embodiment, after the pre-cutting work is completed, the dock door components are hoisted layer by layer and piece by piece using lifting equipment. During the hoisting process, the lifting point position, lifting weight and hoisting speed need to be strictly controlled to ensure the smooth transfer and safe disassembly of each component.

[0057] The following is a detailed description of the invention in conjunction with the various stages of implementation shown in the accompanying drawings:

[0058] 1. Analysis of sand throwing in the dock pit area and stability of dock lowering

[0059] The cross-section of a lying dock gate is generally rectangular in the upper part and inverted trapezoidal in the lower part, with the center of gravity at the upper part. Therefore, it is beneficial to the stability of the dock gate to lay it down and dismantle it. The dock gate in this example is very old and the specific structural drawing has been partially lost. It can be obtained that the upper part of the dock gate is a rectangle with a length of 81 meters, a width of 5 meters, and a height of 6.7 meters, and the lower part of the dock gate is an inverted trapezoidal structure with a top width of 2.5 meters, a bottom width of 1.5 meters, a length of 81 meters, and a height of 5.8 meters.

[0060] like Figure 4 As shown in the figure, before the dock gate is lowered into the water, sand throwing is first carried out in the dock gate pit area to form a stable sand slope in the dock gate pit. Figure 5 As shown. According to the size of each air chamber of the dock gate, the relationship between the buoyancy provided by each air chamber of the dock gate during the lowering process and the gravity of the dock gate itself is accurately calculated and analyzed, and the speed of the dock gate tipping is reduced by considering the resistance of seawater. The pulley wire ropes on both sides of the dock gate are opened to allow the dock gate to tip naturally. The dock gate will not have the risk of sudden tipping. The dock gate will tip down slowly until it stops on the sand slope of the dock gate pit. Figure 6 shown.

[0061] After the water-stopping system of the cofferdam is completed, the water inside the cofferdam is drained to form a dry construction environment. Part of the dock threshold is chiseled off, and the gap in the dock threshold is filled with sand by water flushing to completely fill the unfilled part, ensuring that the dock gate is located on the sand base as a whole. The dock gate is in a stable state due to its own gravity. Figure 7 shown.

[0062] 2. The dock forms a water-stopping system

[0063] During the dock gate removal process, in order to ensure smooth construction, it is usually necessary to build a water-stopping structure system at the dock entrance. Through the construction of the water-stopping system, the external water body can be effectively isolated to form a dry construction environment, thereby providing the necessary construction conditions for the subsequent structural removal.

[0064] 3. Dismantling of dock door

[0065] After a dry construction environment is formed and the unfilled sand portion under the dock gate is completely filled, the dock gate dismantling operation can begin.

[0066] (1) Airtight ventilation inside the dock door and toxic gas detection

[0067] Before starting hot work, use a blower to ventilate the cabin inside the dock door to ensure air circulation in the cabin to effectively eliminate the presence of flammable, explosive and toxic gases, and test the gas after ventilation to ensure the safety of the working environment.

[0068] (2) Construction of dock door cutting platform

[0069] In order to meet the needs of cutting and lifting the side panels after the dock door is lowered, a cutting platform is welded on the side panels. The cutting workers stand on the springboard or walkway board to pre-cut the side panels of the dock door. The design of the cutting platform must be calculated and verified by professional engineers, and auxiliary facilities such as safety life ropes are installed on the platform to ensure the safety of workers and the quality of work during the demolition construction.

[0070] (3) Pre-cutting and removal of side panels after the dock door is folded down

[0071] After the cutting platform is completed, the horizontal plate is marked and pre-cut according to mechanical calculations. In this process, some uncut steel plates and ribs are reserved to bear the weight of the horizontal plate and construction workers and maintain the stability of the structure. After the pre-cutting is completed, the horizontal plate is suspended and supported by lifting equipment, and then the remaining slits are accurately cut to ensure the safety, structural stability and construction quality of the demolition operation, and the side plates are removed piece by piece until the side plates are removed.

[0072] (4) Cutting and removal of horizontal plates and ribs

[0073] After the side panels are cut, according to the internal structure of the dock door, professional engineers accurately calculate and verify the size and location of the lifting steel plate, make vertical and horizontal cuts, retain some ribs to ensure stability, and then use lifting equipment to suspend and support the horizontal plates and ribs, and perform precise cutting of the reserved ribs. The above method is used to cut the dock door layer by layer until it is completely removed.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for dismantling a waste and ineffective horizontal dock door, characterized in that: include: Step S1, sand dumping in the dock pit area and stability analysis of dock lowering; Step S2, construction of a water stop system; Step S3, dock door removal process.

2. A method for dismantling a waste and ineffective horizontal dock door according to claim 1, characterized in that: In step S1, the sand dumping in the dock pit area and the stability analysis of the dock lowering include: Step S11, before the dock gate is lowered into the water, sand throwing construction is first performed in the dock gate pit area to form a stable sand slope in the dock gate pit; Step S12, by accurately calculating and analyzing the relationship between the buoyancy provided by each air chamber of the dock door during the lowering process and the gravity of the dock door itself, until the dock door is lowered to the designated sand slope.

3. A method for dismantling a waste and ineffective horizontal dock door according to claim 2, characterized in that: In step S12, during the lowering process, the air retained in the cabin maintains the stability of the lowering of the dock door, so that it is slowly lowered at a controlled speed until it is safely docked in the dock door pit area with sand thrown in advance to form a sand slope.

4. The method for dismantling a waste and ineffective horizontal dock door according to claim 1, characterized in that: In step S2, a double-row steel sheet pile cofferdam water-stopping system is designed and constructed at the dock entrance to form a completely enclosed water-proof area. By configuring high-efficiency pumping equipment, the water inside the cofferdam is drained to create a dry working environment that meets the construction requirements.

5. The method for dismantling a waste and ineffective horizontal dock door according to claim 1, characterized in that: In step S3, the dock door removal process includes: Step S31, dock door cutting platform and construction auxiliary measures; Step S32, internal processing of the dock door; Step S33, pre-cutting and removing the side panels after the dock door is laid down; Step S34, cutting and removing the horizontal plate and rib plate after the dock door is laid down; Step S35, lifting layer by layer and piece by piece.

6. A method for dismantling a waste and ineffective horizontal dock door according to claim 5, characterized in that: In step S31, the design of the cutting platform is calculated and verified by professional engineers, and auxiliary facilities are set on the platform, including but not limited to safety life ropes.

7. The method for dismantling a waste and ineffective horizontal dock door according to claim 5, characterized in that: In step S32, before the construction begins, the airtight air compartment inside the dock door is fully ventilated by a blower, and at the same time, the compartment is strictly checked for the presence of flammable, explosive or toxic gases. If any abnormality is found, timely elimination measures are taken.

8. The method for dismantling a waste and ineffective horizontal dock door according to claim 5, characterized in that: In step S33, according to the stress state of the side plate after the dock door is laid down, the size and the position of the lifting point of the lifting steel plate are determined through precise calculation and verification by professional engineers; during the cutting process, the uncut steel plate area is reasonably reserved; After the pre-cutting is completed, the horizontal plate is suspended and supported using a lifting device, and then the remaining kerf is precisely cut.

9. The method for dismantling a waste and ineffective horizontal dock door according to claim 5, characterized in that: In step S34, the ribs are arranged perpendicular to the horizontal plates. According to the internal structure of the dock door, the size and the position of the lifting points of the steel plates are determined through precise calculation and verification by professional engineers. The ribs are suspended and supported by lifting equipment, and vertical and horizontal cutting is performed to retain the key connection parts. Then, precise cutting of the connection parts is performed. After the rib cutting is completed, the horizontal plates are cut and lifted in the same way as the side plates.

10. The method for dismantling a waste and ineffective horizontal dock door according to claim 5, characterized in that: In step S35, after the pre-cutting work is completed, the dock door components are hoisted layer by layer and piece by piece using lifting equipment.

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