Method for removing soil between wharf piles

Abstract

The invention relates to the technical field of wharf construction, in particular to a method for removing soil between wharf piles, which comprises the following steps of: carrying out segmented excavation along the length direction of a wharf, and constructing a water retaining dam on the outer side of the front line of the wharf in each segment; the land excavation equipment is used for excavation from the side, facing the land area, of the water retaining dam to the land area, and a first step slope is formed; excavating from the outer side of the front line of the wharf to the direction of the water area by using overwater excavation equipment to form a second slope; and the soil bodies below the first slope and the second slope are excavated in a layered mode, in each layer of excavated soil body, the soil body on the outer side of the front line of the wharf is excavated through water excavation equipment, and the soil body on the inner side of the front line of the wharf is cleaned through a mud suction device. Through the mutual cooperation of the land excavation equipment, the water excavation equipment and the mud suction device, the work of cleaning the soil between the piles of the wharf is achieved, and the problem that due to the existence of pile foundations and pile caps, a traditional grab dredger cannot effectively clean the soil between the piles is solved.

Description

Technical Field

[0001] The invention relates to the technical field of dock construction, and in particular to a method for clearing soil between dock piles. Background Art

[0002] In the traditional operation process of dock construction, the construction team generally uses grab boats or suction boats as the main tools to carry out excavation operations in the established dock construction area to shape the dock's slope foundation. Subsequently, pile foundation construction and the construction of the dock superstructure are further carried out on this slope area. In the process of technological evolution, the applicant has developed a new construction strategy: first transform the dock construction area into a land environment. This transformation may be based on the original land or achieved by backfilling new land. Under this new construction strategy, the construction process is adjusted to first complete the construction of the dock's pile foundation and pile cap structure on stable land, and then carry out earth excavation operations in the gaps between the pile foundations.

[0003] However, due to the existence of pile foundation and pile cap structure, the grab boat used in traditional water excavation cannot enter the area between piles, resulting in the inability to effectively excavate and clean the earth between piles. Therefore, it is necessary to develop a new earth excavation solution to solve the problem that the traditional grab boat cannot effectively clean the soil between piles due to the existence of pile foundation and pile cap. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem in the prior art that the traditional grab boat cannot effectively clean the soil between the piles due to the existence of the pile foundation and the pile cap, and to provide a method for cleaning the soil between the piles of a dock.

[0005] The present invention provides a method for clearing soil between dock piles, which is carried out in sections along the length direction of the dock, and each section includes the following steps: S1: Build a water retaining dam outside the front line of the wharf, and the water retaining dam is arranged along the length direction of the wharf; S2: using onshore excavation equipment to excavate from the side of the retaining dam facing the land toward the land to form a first slope, wherein the first slope extends to the slope surface of the bank slope, and the slope surface above the intersection of the first slope surface and the bank slope is excavated; S3: using water excavation equipment to excavate outside the front line of the wharf toward the water area to form a second slope; S4: excavating the soil below the first slope and the second slope in layers, excavating the soil outside the front line of the wharf using the water excavation equipment, and clearing the soil inside the front line of the wharf using a sludge suction device, thereby completing the soil clearing work between the wharf piles.

[0006] The dock front line refers to the boundary between the water area and the dock pile foundation. The boundary is specifically located on the outermost pile cap surface facing the water area, that is, the side of the pile cap farthest from the land facing the water area. The outer side of the dock front line refers to the side of the dock front line facing the water area, and the inner side of the dock front line refers to the side of the dock front line facing the land area.

[0007] The length direction of the wharf specifically refers to a direction extending along the shoreline and parallel to the water area.

[0008] The present invention provides a method for clearing earth between dock piles, wherein the water retaining dam is used to block waves from the front line of the dock toward the water area, thereby preventing the waves from invading the first slope, thereby preventing the first slope from being damaged by water scouring.

[0009] The first slope is located between the wharf pile foundations. This area is not flooded due to the presence of the water retaining dam, and is not affected by water during excavation. Therefore, the land excavation equipment can be moved between the pile foundations for excavation, which solves the defect that the traditional water excavation cannot enter between the pile foundations for excavation due to the large size of the equipment. At the same time, compared with the water excavation method, this excavation method can greatly improve the excavation efficiency because it is operated in a land environment. Excavation is carried out from the side of the water retaining dam facing the land to the land direction, avoiding damage to the water retaining dam during excavation, and retaining the continuous water retaining function of the water retaining dam. The first slope extends to the slope of the bank slope, and the purpose is to use the land excavation equipment to excavate as much soil between the pile foundations as possible. Compared with the water excavation equipment and the mud suction device, the land excavation equipment has obvious advantages in efficiency and cost, so it can improve the overall excavation efficiency and save excavation costs.

[0010] When excavating toward the water area outside the front line of the wharf using water excavation equipment to form the second slope, the excavation area is located on the side of the front line of the wharf facing the water area and is not affected by the pile foundation. Therefore, water excavation equipment can be used for excavation operations, and there is no need to use different excavation equipment for alternating switching, thereby ensuring a higher excavation efficiency.

[0011] The reason for excavating the first slope first and the second slope later is that when the first slope is excavated, the soil above the second slope can naturally form a barrier. The barrier helps to extend the infiltration path of water in the water area to the first slope, thereby reducing the direct infiltration of water to the first slope, and thus making the first slope more stable after excavation.

[0012] The slopes of the first and second slopes are determined according to the characteristics of the soil at the actual excavation site to ensure that the structures of the first and second slopes are stable and landslides do not occur, providing stable and favorable conditions for the excavation of the soil below the first and second slopes. The reason is that the first slope is located between the wharf pile foundations. If the stability of the first or second slope is insufficient, the soil between the wharf pile foundations may slide, thereby squeezing the pile foundations, which may damage the pile foundations and even cause the risk of the pile foundations breaking in severe cases.

[0013] In order to ensure the stability of the first and second slopes, the soil below the first and second slopes is excavated in layers. The soil outside the front line of the wharf is not affected by the pile foundation, so the water excavation equipment can be used for excavation. The soil inside the front line of the wharf is located within the distribution range of the pile foundation and will be potentially affected by the pile foundation, so the mud suction device is used for soil cleaning. The mud suction device can enter between the pile foundations for soil cleaning, thereby overcoming the defect that traditional water excavation cannot enter between the pile foundations for excavation due to the large size of the equipment.

[0014] Through the cooperation of the onshore excavation equipment, the onshore excavation equipment and the mud suction device, the soil clearing work between the wharf piles is achieved, which solves the problem that the traditional grab boat cannot effectively clean the soil between the piles due to the existence of the pile foundation and the pile cap.

[0015] The land excavation equipment may be one or more of a loader, a common excavator and a long-arm excavator. The width of the land excavation equipment needs to be smaller than the spacing between two adjacent rows of the pile foundations so that the land excavation equipment can move between the pile foundations.

[0016] The above-water excavation equipment may be one or more of a chain bucket dredger, a grab bucket dredger and a cutter suction dredger. The chain bucket dredger digs mud from the bottom of the water and lifts it onto the ship through the continuous movement of a series of bucket chains on the bucket bridge. The grab bucket dredger grabs the mud on the bottom of the water through the grab bucket on the crane. The cutter suction dredger uses a reamer to loosen the mud on the bottom of the river or other waters, and then uses a mud pump to suck the mud slurry from the mud suction pipe into the cabin.

[0017] The dredge suction device may be a pump-suction dredge installed on land, or may be a suction ship movable on water.

[0018] When the soil under the first and second slopes is excavated in layers, the soil outside the wharf front line may be excavated first in each layer, and then the soil inside the wharf front line is excavated; or the soil inside the wharf front line may be excavated first in each layer, and then the soil outside the wharf front line is excavated; or each layer may be excavated alternately, that is, the soil inside the wharf front line is excavated first in one layer, and the soil outside the wharf front line is excavated first in the next layer, and so on.

[0019] Preferably, in step S2, when excavating to form the first slope, the position where the first slope intersects with the pile foundation is excavated into a platform. The purpose of forming the platform is to further improve the stability of the first slope and reduce the risk of landslide. At the same time, forming the platform can also reduce the soil pressure on both sides of the pile foundation, further ensuring the safety of the pile foundation.

[0020] Preferably, in step S2, the slope of the first slope is less than or equal to 1 / 3. This solution is to further ensure the stability of the first slope and reduce the risk of deformation.

[0021] Preferably, in step S4, when the soil below the first slope reduction and the second slope reduction is excavated in layers, the height of each layer is 1m to 2m. The purpose of this scheme is to limit the excavation height of each layer during layered excavation so that the excavation height is maintained within a construction range that takes into account both efficiency and safety. Excessive excavation height will cause a large height difference between soil layers, which may cause the risk of soil landslide. Once a soil landslide occurs, the pile foundation may be squeezed, thereby causing damage to the pile foundation.

[0022] Preferably, a slope reduction operation is performed between the current segment and the next segment to be excavated, and the slope of the slope reduction is less than or equal to 1 / 3. Since each segment is arranged in sequence along the length direction of the wharf, the slope reduction operation is performed along the length direction of the wharf.

[0023] The purpose of this solution is to effectively prevent the lateral earth pressure generated by the sections to be excavated on the pile foundations between the sections, and ensure the structural safety of the pile foundations. Specifically, by implementing the slope reduction operation, the height of the earthwork can be gradually reduced to form a gently transitioning slope. This solution can more effectively disperse the earth pressure, reduce its direct and concentrated effects on the pile foundations, and thus reduce the risk of the pile foundations being damaged by the lateral earth pressure, thereby ensuring the safety and stability of the overall structure.

[0024] Preferably, in step S4, when the soil under the first slope reduction and the second slope reduction is excavated in layers, the following steps are included: S41a: excavating the soil outside the front line of the wharf, and then clearing the soil inside the front line of the wharf; S42a: Entering the next layer of excavation, clearing the soil inside the front line of the wharf, and then excavating the soil outside the front line of the wharf; S43a: cyclically executing the steps S41a and S42a until the excavation work at all levels is completed.

[0025] In the process of layered excavation, the scheme first excavates the soil outside the front line of the wharf, and then clears the soil inside the front line of the wharf; when entering the next layer of excavation, the order is reversed, and the soil on the land side is cleared first, and then the water side is excavated. This alternating excavation method aims to squeeze the pile foundation alternately from two directions by changing the excavation order of each layer of soil, so as to avoid a one-way continuous squeezing effect on the pile foundation, thereby effectively reducing the deformation risk of the pile foundation.

[0026] In step S41a, the purpose of first excavating the soil outside the front line of the wharf is to ensure the feasibility of using a suction boat to clean the soil inside the front line of the wharf during the first layer excavation. The purpose of excavating the soil outside the front line of the wharf is to create enough operating space for the suction boat during the first layer excavation, so that the suction boat can smoothly approach and operate on the soil inside the front line of the wharf.

[0027] Preferably, in step S2, when water accumulates between the first slope and the slope surface of the bank during excavation, the accumulated water is pumped out. After the first slope is formed by excavation, due to the effect of osmotic pressure, water in the water area will seep out through the first slope and gradually accumulate in the area between the first slope and the slope surface of the bank. The accumulated water will have an adverse effect on the excavation of the onshore excavation equipment, so a pumping device can be used to pump out the accumulated water to provide a good excavation working environment.

[0028] Preferably, the step S3 includes the following steps: S31: excavating a plurality of water inlets on the water retaining dam, so that water outside the water retaining dam flows through the water inlets to the first slope excavation area; S32: After the water levels inside and outside the retaining dam are consistent, use the water excavation equipment to excavate from the outside of the front line of the wharf toward the water area to form the second slope.

[0029] The purpose of this scheme is to steadily adjust the water levels on both sides of the dam so that they gradually reach a balanced state, thereby preventing potential scouring damage to the first slope or the slope surface that has been excavated due to rapid water flow into the inside of the dam.

[0030] Preferably, in step S2, the land excavation equipment is a long-arm excavator; in step S3 and step S4, the water excavation equipment includes a grab dredger and / or a cutter suction dredger. Compared with ordinary excavators, the long-arm excavator can operate at a longer distance due to its lengthened working arm, reducing the number of times the excavator is moved, thereby saving time and improving excavation efficiency. The water excavation equipment may include only the grab dredger or the cutter suction dredger, or may include both the grab dredger and the cutter suction dredger.

[0031] Preferably, in step S4, the sludge suction device is a suction ship, and the suction ship includes a high-pressure water gun and a sludge suction pump. When the soil inside the front line of the wharf is cleared, the following steps are included: S41b: using the high-pressure water gun to spray the soil, so that the soil is mixed with water to form a mud-water mixture; S42b: Use the silt extraction pump to perform suction operation on the mud-water mixture.

[0032] Compared with the pump-suction dredge installed on land, the suction vessel has higher mobility and flexibility, which is conducive to further improving construction efficiency.

[0033] The high-pressure water gun forms a strong water column with the help of high-pressure water generated by the high-pressure water pump. The water column is used to impact the sediment or silt, so that it changes from a deposited state to a loose or floating state, forming the mud-water mixture. The silt extraction pump is used to extract the mud-water mixture and transport it to a designated location through a pipeline. Through the coordination of the high-pressure water gun and the silt extraction pump, the construction efficiency of the overall excavation and soil clearing operation can be further improved.

[0034] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for clearing soil between dock piles. Through the cooperation of the onshore excavation equipment, the onshore excavation equipment and the mud suction device, the soil clearing work between the dock piles is achieved, thereby solving the problem that the traditional grab boat cannot effectively clean the soil between the piles due to the existence of pile foundations and pile caps. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of excavation of the first excavation area in the present invention.

[0036] Figure 2This is a schematic diagram of excavation of the second excavation area in the present invention.

[0037] Figure 3 This is a schematic diagram of the first excavation of the third excavation area in the present invention.

[0038] Figure 4 This is a schematic diagram of the second excavation of the third excavation area in the present invention.

[0039] Figure 5 It is a schematic diagram of the wharf after excavation is completed in the present invention.

[0040] Markings in the figure: 1-bank slope, 101-slope, 2- The first excavation area, 201-First slope, 3- The second excavation area, 301-Second slope, 4- Retaining dam, 5- The third excavation area, 6- Pile foundation, 7- Pile cap, 8- Onshore excavation equipment, 9-Water excavation equipment, 10- Mud suction device, 11- Water level, 12- Pier front line. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0042] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0043] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0044] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0045] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0046] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0047] Example 1 A method for clearing soil between dock piles, such as Figures 1 to 5 As shown, excavation is carried out in sections along the length of the wharf, and each section includes the following steps: S1: Build a water retaining dam 4 outside the front line 12 of the wharf, and the water retaining dam 4 is arranged along the length direction of the wharf. The top surface height of the water retaining dam 4 is higher than the water level line 11. The water retaining dam 4 is piled up by taking soil on the spot, and the height of the water retaining dam 4 is 1m to 1.5m.

[0048] S2: Use the onshore excavation equipment 8 to excavate from the side of the water retaining dam 4 toward the land to form the first slope 201, the first slope 201 extends to the slope surface 101 of the bank slope 1, and excavate the slope surface 101 above the intersection of the slope surface 101 and the first slope 201. The excavation area corresponds to Figure 1 The first excavation area 2.

[0049] Excavation can be performed toward the land at a predetermined distance on the side of the dam 4 facing the land to avoid unnecessary disturbance to the dam 4 during excavation and improve the stability of the dam 4. The predetermined distance can be 0.5m to 2m, and the specific distance can be 0.5m, 1m, 1.5m or 2m.

[0050] When excavating the first excavation area 2, the excavation can be retreated toward the land at a distance of 1m from the side of the water retaining dam 4 toward the land. The retreat excavation method is adopted for the first excavation area 2, and the land excavation equipment 8 can operate continuously without frequent movement, thereby improving the excavation efficiency. At the same time, the area to be excavated can provide stable support for the land excavation equipment 8, reducing the risk of the land excavation equipment 8 sinking into the soil.

[0051] S3: Use the water excavation equipment 9 to excavate outside the front line 12 of the wharf towards the water area to form a second slope 301. The second slope 301 can be a slope or a step, such as Figure 1 The excavation area corresponds to Figure 1 The second excavation area 3 in the excavation. When the second excavation area 3 is excavated, a layered excavation method can be adopted, and the height of each layer does not exceed 2m.

[0052] S4: Excavate the soil below the first slope 201 and the second slope 301 in layers. In each layer of excavated soil, use the water excavation equipment 9 to excavate the soil outside the dock front line 12, and use the mud suction device 10 to clean the soil inside the dock front line 12, and complete the soil cleaning work between the dock piles. Figure 1 The third excavation area 5 , the bottom of the third excavation area 5 is in contact with the slope surface 101 of the bank slope 1 .

[0053] In an optional embodiment, in step S2, when excavating to form the first slope 201, the position where the first slope 201 intersects with the pile foundation 6 can be excavated into a platform. The width of the platform can be greater than the size of the pile foundation 6, and specifically, both sides of the platform can exceed the pile foundation 6 by at least 0.5 meters.

[0054] In an optional implementation, in step S2, the slope of the first slope reduction 201 may be less than or equal to 1 / 3, and the specific slope may be 1 / 3, 0.3, 0.25, 0.2 or 0.15.

[0055] Specifically, the first platform is located on the landward side of the bottom of the water retaining dam 4. The width of the first platform 202 is 1m. From the landward edge of the first platform, the slope is lowered at a slope of 1 / 3 to the two pile foundations 6 corresponding to the pile caps 7 closest to the water area, and a second platform with a width of 2m is formed at this position. Then, from the landward edge of the second platform 203, the slope is lowered at a slope of 1 / 3 to the pile foundation 6 corresponding to the first pile cap 7 from the water area to the landward direction, and a third platform with a width of 2m is formed at this position. Then, from the landward edge of the third platform, the slope is lowered at a slope of 1 / 3 to the position where it intersects with the slope surface 101.

[0056] In an optional implementation manner, in step S4, when the soil below the first slope 201 and the second slope 301 is excavated in layers, the height of each layer may be 1m to 2m. The specific height may be 1m, 1.2m, 1.5m, 1.6m, 1.8m, or 2.0m.

[0057] In an optional implementation, a slope reduction operation is performed between the current segment and the next segment to be excavated, and the slope of the slope reduction can be less than or equal to 1 / 3. The specific slope can be 1 / 3, 0.32, 0.3, 0.28. The length of each segment can be 40m-60m, specifically 40m, 45m, 50m, 55m, 60m.

[0058] In an optional implementation manner, in step S4, when the soil below the first slope 201 and the second slope 301 is excavated in layers, the following steps may be included: S41a: excavating the soil outside the wharf front line 12, and then clearing the soil inside the wharf front line 12.

[0059] S42a: Entering the next layer of excavation, clearing the soil inside the dock front line 12, and then excavating the soil outside the dock front line 12.

[0060] S43a: cyclically executing the steps S41a and S42a until the excavation work at all levels is completed.

[0061] In an optional implementation, in step S2, when water accumulates between the first slope 201 and the slope surface 101 of the bank slope 1 during excavation, the accumulated water can be pumped out. This step is specifically as follows: if water accumulates in the first excavation area 2, the accumulated water in the first excavation area 2 is pumped out. The maximum depth position of the first excavation area 2 can be lower than the water level 11, and under the action of water osmotic pressure, water gradually accumulates in the first excavation area 2. Specifically, a pumping pump can be used to pump the accumulated water to the water area outside the water retaining dam 4.

[0062] Water level 11 is the design water level, which is generally the average water level of the dock during construction.

[0063] In an optional implementation manner, the step S3 may include the following steps: S31: Dig several water inlets on the water retaining dam 4 so that the water outside the water retaining dam 4 flows to the excavation area of ​​the first slope 201 through the water inlets. The water inlets allow the water outside the water retaining dam 4 to flow into the first excavation area 2. The water inlets can be set at intervals of 10m, 15m or 20m. The bottom elevation of the water inlet is 10cm-20cm lower than the water level line 11, and the width of the water inlet is 1m-2m. The side walls and bottom surface of the water inlet can be paved with thin steel plates. The purpose of this is to reduce the scouring effect of the water flow on them, so that the water flow of the water inlet is controlled within a certain range.

[0064] S32: After the water levels inside and outside the water retaining dam 4 are consistent, the water excavation equipment 9 is used to excavate from the outside of the dock front line 12 toward the water area to form a second slope 301.

[0065] In an optional embodiment, in step S2, the onshore excavation equipment 8 may be a long-arm excavator. In steps S3 and S4, the water excavation equipment 9 may include a grab dredger and / or a cutter suction dredger. Specifically, the long-arm excavator is crawler-type, and the long-arm excavator may be a long-arm excavator with an arm length of 22 m. The water excavation equipment 9 includes a grab dredger and a cutter suction dredger, and the bucket capacity of the grab dredger may be 6m³-8m³. Depending on the geological conditions of the excavation area, the grab dredger may be used for the silty soil layer, and the cutter suction dredger may be used for the sandy soil layer. The grab dredger may be used in conjunction with a mud barge, and the mud barge is used to load the soil excavated by the grab dredger, and then transport it to a designated location for unloading.

[0066] When using the grab dredger for layered excavation, in order to ensure that the layered excavation accuracy during the construction process is controlled within 2 meters per layer, a clear equidistant scale mark can be set every 2 meters on the wire rope used by the grab bucket of the grab dredger to guide and control the excavation depth.

[0067] To ensure the safety of the wharf pile foundation 6 and the pile cap 7, both the grab dredger and the cutter suction dredger need to be at least 5 m away from the wharf front line 12.

[0068] In an optional embodiment, in step S4, the sludge suction device 10 may be a suction ship, and the suction ship may include a high-pressure water gun and a sludge suction pump. When the soil inside the front line 12 of the wharf is cleared, the following steps may be included: S41b: using the high-pressure water gun to spray the soil, so that the soil is mixed with water to form a mud-water mixture; S42b: Use the silt extraction pump to perform suction operation on the mud-water mixture.

[0069] Specifically, the suction boat can be a small suction boat with a length of 18.3m and a width of 3m. When the suction boat is working, the high-pressure water gun is responsible for stirring the underwater silt or sand into mud, and then starting the silt extraction pump to suck the mud and transport it to a designated container. The gun head of the high-pressure water gun and the suction pipe mouth of the silt extraction pump move together in an S-shaped path between two adjacent rows of pile foundations 6. The specific moving direction can be moving from the side close to the land to the water area, or from the side close to the water area to the land area.

[0070] When the suction boat is used for layered excavation, the excavation depth is controlled by a water level gauge to ensure that the excavation thickness of each layer is 2 meters.

[0071] In an optional embodiment, in step S2, before the first slope 201 is excavated, the construction platform between the pile caps 7 can be processed to ensure that the onshore excavation equipment 8 is in a stable and safe position, and a reasonable dump truck loading position and route are set. The onshore excavation equipment 8 transfers the excavated earth to the dump truck, and the dump truck then transports the earth to a designated dumping site or soil pile site. If the construction platform between the pile caps 7 cannot support the onshore excavation equipment 8 or the dump truck, crushed stone backfill is required to improve the bearing capacity.

[0072] In an optional embodiment, when using the onshore excavation equipment 8 for excavation, the onshore excavation equipment 8 can maintain a distance of at least 50 cm from the pile foundation 6 and the pile cap 7 to avoid damage to the pile foundation 6 or the pile cap 7. For soil bodies that are less than 50 cm away from the pile foundation 6 or the pile cap 7, and soil bodies that are inconvenient to directly excavate due to the close distance between two adjacent pile foundations 6, two treatment strategies can be adopted: one is to use the natural collapse characteristics of the soil body during the excavation process to make it slide to an area that is easy to construct; the other is to use a high-pressure water gun to flush these difficult-to-excavate soil bodies and prompt them to move to a position that is convenient for operation.

[0073] In an optional embodiment, before excavation, the pile caps 7 of the pile foundations 6 in the same row can be integrally connected using assembled channel steel frames to achieve a pile clamping operation on the pile caps 7 in the same row. The pile foundations 6 in the same row refer to piles whose arrangement direction is perpendicular to the length direction of the wharf. Through the pile clamping operation, the pile caps 7 in the same row are integrally connected, which can improve the cooperative working ability between the pile foundations 6 and enhance the stability of the overall structure. During the excavation process, this integral connection can more effectively resist external loads and soil pressure, and prevent the pile body of the pile foundation 6 from displacement, tilting or damage.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for clearing soil between dock piles, characterized in that: Along the length of the wharf, excavation is carried out in sections, and each section includes the following steps: S1: constructing a water retaining dam (4) outside the front line (12) of the wharf, wherein the water retaining dam (4) is arranged along the length direction of the wharf; S2: using an onshore excavation device (8) to excavate from the side of the water retaining dam (4) facing the land towards the land, to form a first slope (201), wherein the first slope (201) extends to the slope surface (101) of the bank slope (1), and the slope surface (101) above the intersection of the slope surface (101) and the first slope (201) is excavated; S3: using an above-water excavation device (9) to excavate outside the front line (12) of the wharf in a direction of the water area to form a second slope (301); S4: excavating the soil below the first slope (201) and the second slope (301) in layers, and in each layer of excavated soil, excavating the soil outside the front line (12) of the wharf using the above-water excavation equipment (9), and clearing the soil inside the front line (12) of the wharf using the sludge suction device (10), thereby completing the soil clearing work between the wharf piles.

2. A method for clearing soil between dock piles according to claim 1, characterized in that: In the step S2, when excavating to form the first slope (201), the position where the first slope (201) intersects with the pile foundation (6) is excavated into a platform.

3. The method for clearing soil between dock piles according to claim 1, characterized in that: In the step S2, the slope of the first slope reduction (201) is less than or equal to 1 / 3.

4. The method for clearing soil between dock piles according to claim 1, characterized in that: In the step S4, when the soil below the first slope reduction (201) and the second slope reduction (301) is excavated in layers, the height of each layer is 1m to 2m.

5. The method for clearing soil between dock piles according to claim 1, characterized in that: A slope reduction operation is performed between the current segment and the next segment to be excavated, and the slope of the slope reduction is less than or equal to 1 / 3.

6. A method for clearing soil between dock piles according to any one of claims 1 to 5, characterized in that: In the step S4, when the soil under the first slope reduction (201) and the second slope reduction (301) is excavated in layers, the following steps are included: S41a: excavating the soil outside the front line (12) of the wharf, and then clearing the soil inside the front line (12) of the wharf; S42a: Entering the next layer of excavation, clearing the soil inside the front line (12) of the wharf, and then excavating the soil outside the front line (12) of the wharf; S43a: cyclically executing the steps S41a and S42a until the excavation work at all levels is completed.

7. A method for clearing soil between dock piles according to claim 6, characterized in that: In the step S2, when water accumulates between the first slope reduction (201) and the slope surface (101) of the bank slope (1) during the excavation process, the accumulated water is pumped out.

8. The method for clearing soil between dock piles according to claim 6, characterized in that: The step S3 includes the following steps: S31: excavating a plurality of water inlets on the water retaining dam (4), so that water outside the water retaining dam (4) flows through the water inlets to the excavation area of ​​the first slope reduction (201); S32: After the water levels inside and outside the water retaining dam (4) are consistent, use the above-water excavation equipment (9) to excavate from the outside of the dock front line (12) towards the water area to form the second slope (301).

9. The method for clearing soil between dock piles according to claim 6, characterized in that: In step S2, the onshore excavation equipment (8) is a long-arm excavator; in steps S3 and S4, the onshore excavation equipment (9) includes a grab dredger and / or a cutter suction dredger.

10. The method for clearing soil between dock piles according to claim 6, characterized in that: In step S4, the sludge suction device (10) is a suction ship, and the suction ship includes a high-pressure water gun and a sludge suction pump. When the soil inside the front line (12) of the dock is cleared, the following steps are included: S41b: using the high-pressure water gun to spray the soil, so that the soil is mixed with water to form a mud-water mixture; S42b: Use the silt extraction pump to perform suction operation on the mud-water mixture.

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