Cutter suction system for excavation between wharf piles, and construction method

Abstract

The present application relates to a cutter suction system for excavation between wharf piles and a sand suction method therefor. The cutter suction system comprises: two first rails, which are arranged in parallel and are erected on the tops of a plurality of pile foundations arranged in a longitudinal direction; a first moving frame, which is transversely slidably erected between the two first rails, and is provided with a second rail extending in a transverse direction; a trolley, which is slidably connected to the second rail of the first moving frame; a guide pipe mounted on the trolley by means of a constraint mechanism, wherein the guide pipe is arranged in a vertical direction, and ascends and descends relative to the constraint mechanism in the vertical direction; and a lifting assembly, which is used for driving the guide pipe to ascend and descend. The cutter suction system can be erected on the tops of the wharf pile foundations, and is applicable to the excavation of backfill sand and dense undisturbed sand between the wharf piles.

Description

Cutter suction system for excavation between wharf piles and construction method

[0001] The present application claims priority to Chinese Patent Application No. 2024117075244, filed on November 27, 2024, and entitled "Cutter suction system for excavation between wharf piles and sand suction method thereof"; and Chinese Patent Application No. 2024117075193, filed on November 27, 2024, and entitled "Construction method for wharf slope excavation"; the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application belongs to the technical field of excavation construction, and particularly relates to a cutter suction system for excavation between wharf piles and a construction method. BACKGROUND

[0003] In some offshore high-pile wharf project constructions, in order to improve construction safety, the process of "first building an island to form a dry land construction condition to carry out high-pile wharf pile foundation construction, and then back-digging to form a slope" is adopted. However, in this "first building an island, then back-digging" high-pile wharf construction process, due to the limitation of the space between the piles, the special excavation ship cannot enter the pile space for construction, and the excavation of the backfill sand and the compacted original sand in the pile space is extremely difficult, which seriously affects the construction efficiency and construction period of the excavation, and moreover, if the excavation greatly disturbs the pile foundation, it is easy to cause slope collapse and cause serious accidents. Therefore, how to provide a construction equipment and method suitable for the excavation between the piles of the wharf to improve the excavation efficiency of the backfill sand and the compacted sand in the pile space and reduce the construction risk is a technical difficulty that needs to be solved at present. SUMMARY

[0004] In order to solve some problems existing in the prior art, the present application provides a cutter suction system for excavation between wharf piles and a construction method; the cutter suction system can be erected on the top of the wharf pile foundation and can be suitable for the excavation of the sand layer between the piles of the wharf.

[0005] The first aspect of the present application provides a cutter suction system for excavation between wharf piles, taking the length direction of the wharf as the longitudinal direction and the width direction as the transverse direction, the cutter suction system comprising:

[0006] two first tracks, which are arranged parallel to each other; each first track extends along the longitudinal direction and is erected on the top of a plurality of pile foundations arranged along the longitudinal direction;

[0007] a first moving frame, which is erected between the two first tracks along the transverse direction; the first moving frame is slidably connected to the first tracks to be movable along the longitudinal direction; the first moving frame is provided with a second track extending along the transverse direction;

[0008] a trolley, which is slidably connected to the second track of the first moving frame to be movable with the first moving frame and movable relative to the first moving frame along the transverse direction;

[0009] a guide pipe mounted on the trolley by a restraint mechanism to move with the trolley; the guide pipe is arranged in a vertical direction and can be lifted in the vertical direction relative to the restraint mechanism to extend the bottom end of the guide pipe into the space between the pile foundations when the guide pipe is lowered, and to retract the bottom end of the guide pipe to a position above the top of the pile foundations when the guide pipe is lifted; the restraint mechanism is configured to limit the lifting direction of the guide pipe during the lifting of the guide pipe;

[0010] a suction head connected to the bottom end of the guide pipe for sand suction operation between the pile foundations; and

[0011] a lifting assembly configured to drive the guide pipe to lift to regulate the operation height of the suction head for sand suction operation between the pile foundations.

[0012] In an embodiment, the second track is two, and the portion between the two second tracks of the first moving frame forms a first operation window penetrating the first moving frame in the vertical direction; the trolley comprises a second moving frame arranged between the two second tracks and limited to move within the range of the first operation window; the second moving frame forms a second operation window penetrating the second moving frame in the vertical direction, and the second operation window is in communication with the first operation window; the restraint mechanism comprises a restraint frame sleeved outside the guide pipe to limit the lifting direction of the guide pipe, and the restraint frame is mounted in the second operation window to limit the guide pipe in the second operation window and move together with the second moving frame within the range of the first operation window.

[0013] In an embodiment, the outer wall of the guide pipe is provided with a guide rail extending in the vertical direction, and the side of the restraint frame facing the guide rail is provided with a limiting guide groove, and the guide rail is accommodated in the limiting guide groove to realize the sliding fit in the vertical direction.

[0014] In an embodiment, the lifting assembly comprises a lifting traction winch, a lifting traction rope wound on the lifting traction winch, and a fixed pulley; the lifting traction winch is mounted on the restraint frame, the fixed pulley is mounted on the bottom end of the guide pipe, and the free end of the lifting traction rope is tied to the restraint frame after passing through the fixed pulley.

[0015] In an embodiment, the bottom of the second moving frame is provided with a first sliding block and a limiting sliding block; the first sliding block is in sliding fit with the top surface of the second track; the limiting sliding block is detachably connected with the second moving frame, and one side of the limiting sliding block extends below the first sliding block to form a limiting groove for clamping the edge of the second track between the limiting sliding block and the first sliding block.

[0016] In an embodiment, the bottom of the first moving frame is provided with a walking wheel in rolling cooperation with the first track, the walking wheel is connected with a longitudinal moving driving motor for driving the walking wheel to rotate to drive the first moving frame to move longitudinally; the second moving frame is connected with the first moving frame with a transverse moving driving assembly for driving the trolley to move transversely, the transverse moving driving assembly comprises a transverse moving traction winch, a transverse moving traction rope and two transverse moving guide wheels, the transverse moving traction winch is installed on the first moving frame, the two transverse moving guide wheels are respectively installed on the opposite ends of the first moving frame in the transverse direction, the middle part of the transverse moving traction rope is wound on the transverse moving traction winch, and the two free ends of the transverse moving traction rope are connected to the second moving frame after passing through the two transverse moving guide wheels respectively.

[0017] In an embodiment, the second moving frame comprises a top frame located at the top and a bottom frame located at the bottom; the top of the top frame is formed with two track surfaces extending in the longitudinal direction, the two track surfaces are respectively close to the two side edges of the second working window in the transverse direction; the opposite side outer walls of the constraint frame are respectively provided with a lap joint on the track surface in the transverse direction, the lap joint is in sliding cooperation with the track surface, so that the constraint frame moves in the longitudinal direction in the second working window relative to the second moving frame; the opposite side inner walls of the top frame are respectively provided with a first sliding groove extending in the longitudinal direction, and the opposite side outer walls of the constraint frame are respectively provided with a second sliding block in sliding cooperation with the first sliding groove; the opposite side inner walls of the bottom frame are respectively provided with a second sliding groove extending in the longitudinal direction, and the opposite side outer walls of the constraint frame are respectively provided with a third sliding block in sliding cooperation with the second sliding groove.

[0018] In an embodiment, the constraint frame is connected with the second moving frame with a longitudinal moving driving assembly for driving the constraint frame to move in the second working window, the longitudinal moving driving assembly comprises a longitudinal moving traction winch, a longitudinal moving traction rope and two longitudinal moving guide wheels, the longitudinal moving traction winch is installed on the second moving frame, the two longitudinal moving guide wheels are respectively installed on the opposite ends of the second moving frame in the longitudinal direction, the middle part of the longitudinal moving traction rope is wound on the longitudinal moving traction winch, and the two free ends of the longitudinal moving traction rope are connected to the constraint frame after passing through the two longitudinal moving guide wheels respectively.

[0019] The second aspect of the present application provides a method for excavating and sand suction between piles of a wharf, which can be performed by using the cutter suction system described in any of the preceding embodiments, and the method comprises the following steps:

[0020] Cutter suction preparation: after the cutter suction system is erected on the top of the constructed pile foundation of the wharf, the cutter suction head on the guide pipe is lifted to a position above the top of the pile foundation;

[0021] Cutter suction head positioning: the first moving frame is moved to the first end of the longitudinal direction of the wharf in the longitudinal direction, the trolley is moved to one end of the first moving frame in the transverse direction, and the guide pipe is lowered by the lifting assembly so that the cutter suction head is inserted into the position to be excavated between the pile foundations.

[0022] Suction dredging: after the suction head 21 is in place, the trolley is driven to move the suction head along the transverse direction step by step, while continuously sucking sand at the positions passed by the suction head, to complete the excavation work of the current first work window of the first moving frame;

[0023] Moving operation: after the trolley moves to the other end of the first moving frame in the transverse direction, the excavation work of the current first work window is completed; the first moving frame is driven to move to the next adjacent first work window in the longitudinal direction;

[0024] Repeating operation: repeating the suction dredging step and the moving operation step until the first moving frame moves to the second end of the wharf in the longitudinal direction opposite to the first end of the wharf, to complete the excavation work between the pile foundations below the wharf; and

[0025] Recovering the suction head: the guide pipe is raised by the lifting assembly, so that the suction head is recovered to a position above the top of the pile foundation.

[0026] In an embodiment, in the suction dredging step, the guide pipe is driven to rise and fall by the lifting assembly, to real-time regulate the working height of the suction head in the sand suction work between the pile foundations.

[0027] The third aspect of the present application provides a wharf shore slope excavation construction method, which can be applied to a pile foundation wharf constructed by backfilling and building an island, to excavate a section formed by the backfilling and building of the island.

[0028] The section to be excavated includes shallow backfill sand layers, remaining backfill sand layers and original sand layers which are sequentially distributed in the vertical direction, wherein the shallow backfill sand layers are located at the uppermost position and are divided into a first shallow backfill sand layer located at the front edge of the wharf and a second shallow backfill sand layer located between the pile foundations under the wharf beam, which are adjacently distributed along the transverse direction; the remaining backfill sand layers are divided into a first remaining backfill sand layer located at the front edge of the wharf and a second remaining backfill sand layer located between the pile foundations under the wharf beam, which are adjacently distributed along the transverse direction; and the original sand layers are divided into a first original sand layer located at the front edge of the wharf and a second original sand layer located between the pile foundations under the wharf beam, which are adjacently distributed along the transverse direction.

[0029] The construction method includes the following steps:

[0030] Shallow backfill sand layer excavation: a first shallow backfill sand layer of the section is excavated by a excavator, and then a second shallow backfill sand layer is excavated;

[0031] Remaining backfill sand layer excavation: the first remaining backfill sand layer is excavated by a sand dredging ship, and the second remaining backfill sand layer is excavated by a diving sand pump or a double-rope grab;

[0032] The first original sand layer is excavated by the cutter suction dredger, and the second original sand layer is excavated by the cutter suction system carried on the top of the wharf pile foundation until the design elevation is reached to form the shore slope.

[0033] In an embodiment, the first and second shallow backfill sand layers are excavated to a range of +2.0m to -1.0m in the shallow backfill sand layer excavation step. In addition, the slope sand bag is excavated first, and then the backfill sand is excavated when the first shallow backfill sand is excavated. The excavated backfill sand is backfilled to the stockyard area behind the wharf by the self-unloading truck.

[0034] In an embodiment, the first and second remaining backfill sand layers are excavated to a range of -1.0m to -8.0m in the remaining backfill sand layer excavation step. The first and second original sand layers are excavated to a range of -8.0m to -17.9m in the original sand layer excavation step.

[0035] In an embodiment, the first and second remaining backfill sand layers are excavated from top to bottom in multiple layers in the remaining backfill sand layer excavation step, and the total number of layers of the first remaining backfill sand layer excavation is the same as that of the second remaining backfill sand layer excavation. During the excavation construction, the excavation progress of the first remaining backfill sand layer is kept one layer ahead of that of the second remaining backfill sand layer. The first and second original sand layers are excavated from top to bottom in multiple layers in the original sand layer excavation step, and the total number of layers of the first original sand layer excavation is the same as that of the second original sand layer excavation. During the excavation construction, the excavation progress of the first original sand layer is kept one layer ahead of that of the second original sand layer.

[0036] In an embodiment, the overlap width between the first and second remaining backfill sand layers is at least 5m during excavation, and the overlap width between the first and second original sand layers is at least 5m.

[0037] In an embodiment, the construction method further comprises a shore slope excavation acceptance step: after the shore slope excavation is completed, the excavation depth is checked, wherein the construction area between the piles under the wharf beam is checked by the leadline, and the construction area in front of the wharf is checked by the single-beam depth finder. When over-excavation is detected, sand bags are immediately thrown to find the slope. When the design elevation and design slope are not reached, a sand suction pump is used to locally repair the slope. For loose sand areas that are difficult to form a design slope during excavation, sand bags are thrown to find the slope to meet the design slope requirement.

[0038] Compared with the prior art, the application has the advantages and positive effects that:

[0039] 1. In at least one embodiment of the present application, a cutter suction system is provided, in which a first track is provided so that the entire cutter suction system is installed on top of the wharf pile foundation. A guide tube is supported on the first track by a trolley and a first movable frame. A cutter suction head is connected to the bottom of the guide tube. The guide tube is driven down by a lifting assembly, allowing the cutter suction head to extend between the pile foundations to suck sand. This enables the excavation of backfill sand and dense undisturbed sand between the wharf piles, resulting in high excavation efficiency and low construction risk.

[0040] 2. In at least one embodiment of the present application, the cutter suction system provides a system in which the operating position of the cutter suction head can be adjusted by moving the first movable frame along the first track and the trolley along the second track of the first movable frame. The operating height of the cutter suction head can be adjusted by driving the guide tube up and down by the lifting assembly, thereby facilitating control of excavation accuracy. The cutter suction system has a simple structure and is easy to set up and dismantle.

[0041] 3. At least one embodiment of the present application provides a sand suction method that installs a cutter suction system on top of the wharf pile foundation. The cutter suction head is lowered between the piles via a guide pipe of the cutter suction system to achieve excavation of backfill sand and compacted undisturbed sand between the wharf piles. This method reduces construction risk. Furthermore, the longitudinal movement of the first movable frame and the lateral movement of the trolley enable continuous cutter suction excavation, resulting in high excavation efficiency.

[0042] 4. The construction method provided by at least one embodiment of the present application divides the excavation of the bank slope of the "first island building, then back-dig" wharf into three stages; according to different sand layers and areas, a variety of excavation methods are adopted to cooperate with the construction, thereby realizing efficient excavation of the bank slope of the "first island building, then back-dig" wharf with low construction risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] FIG1 is a schematic structural diagram of a cutter suction system according to an embodiment of the present application;

[0044] FIG2 is a schematic diagram of the assembly structure of the first movable frame and the first track in the cutter suction system;

[0045] FIG3 is an assembly perspective view of the trolley and the first movable frame in the cutter suction system;

[0046] FIG4 is a top view of the assembly of the trolley and the first movable frame in the cutter suction system;

[0047] Figure 5 is an enlarged view of part A in Figure 3;

[0048] FIG6 is a schematic diagram of the assembly structure of the restraint frame and the trolley in the cutter suction system at a first angle;

[0049] FIG7 is a schematic diagram of the assembly structure of the restraint frame and the trolley in the cutter suction system at a second angle;

[0050] Figure 8 is an enlarged view of part B in Figure 6;

[0051] Figure 9 is an enlarged view of section C in Figure 7;

[0052] Figure 10 is an enlarged view of section D in Figure 7;

[0053] Figure 11 is an assembled perspective view of the guide tube and restraint mechanism in the cutter suction system;

[0054] Figure 12 is an assembled top view of the guide tube and restraint frame in the cutter suction system;

[0055] Figure 13 is an enlarged view of section E in Figure 11;

[0056] Figure 14 is a top view of a wharf and cross section according to one embodiment;

[0057] Figure 15 is a schematic view of the construction of the first shallow layer of backfill sand for excavation;

[0058] Figure 16 is a schematic view of the construction of the second shallow layer of backfill sand for excavation;

[0059] Figure 17 is a schematic view of the construction of the remaining backfill sand layer for island building for excavation;

[0060] Figure 18 is a schematic view of the construction of the original sand layer for excavation;

[0061] In the figure: 1 wharf, 11 pile foundation, 12 top of pile foundation, 101 first working window, 102 second working window; 2 cutter suction system, 21 cutter suction head, 22 guide pipe, 221 bottom end of guide pipe, 222 guide rail, 23 first track; 24 first moving frame, 241 second track, 2411 edge of second track, 242 walking wheel, 243 longitudinal moving driving motor, 244 transverse moving driving assembly, 2441 transverse moving traction winch, 2442 transverse moving traction rope, 2443 first transverse moving guide wheel, 2444 second transverse moving guide wheel; 25 trolley, 251 second moving frame, 2511 top frame, 2512 bottom frame, 2513 track surface, 2514 first sliding groove, 2515 second sliding groove, 252 first sliding block, 253 limiting sliding block, 254 longitudinal moving driving assembly, 2541 longitudinal moving traction winch, 2542 longitudinal moving traction rope, 2543 first longitudinal moving guide wheel, 2544 second longitudinal moving guide wheel, 256 limiting groove; 26 constraint mechanism, 261 constraint frame, 262 limiting guide groove, 263 block, 264 second sliding block, 265 third sliding block; 27 lifting assembly, 271 lifting traction winch, 272 lifting traction rope, 273 fixed pulley; 3 cross section, 31 shallow backfill sand layer, 311 first shallow backfill sand layer, 312 second shallow backfill sand layer, 32 remaining backfill sand layer, 321 first remaining backfill sand layer, 322 second remaining backfill sand layer, 33 original sand layer, 331 first original sand layer, 332 second original sand layer; 401 excavator, 402 sand pumping ship, 403 grab bucket, 404 cutter suction dredger, 405 crawler crane; X longitudinal direction, Y transverse direction, Z vertical direction. DETAILED DESCRIPTION

[0062] The technical solutions of the present application will be described in detail below in conjunction with the specific embodiments. However, it should be understood that the elements, structures and features in one embodiment can be beneficially combined into other embodiments without further description.

[0063] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features.

[0064] In the description of the present application, it should be understood that the terms "upper", "lower", "bottom", "inner" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in Figure 1, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] As shown in FIGS. 1-13, the first embodiment of the present application provides a cutter suction system for wharf pile excavation (hereinafter referred to as cutter suction system); the length direction of wharf 1 is longitudinal X, the width direction is transverse Y, and the two are approximately perpendicular to each other; the cutter suction system 2 comprises a first track 23, a first moving frame 24, a trolley 25, a guide pipe 22, a cutter head 21 and a lifting assembly 27; wherein the first track 23 is two, arranged parallel to each other; each first track 23 extends along the longitudinal X and is erected on the top 12 of the plurality of pile foundations 1 arranged along the longitudinal X. The first moving frame 24 is arranged between the two first tracks 23 along the transverse Y and is slidingly connected to the first track 23 to be able to move along the longitudinal direction. The first moving frame 24 is provided with a second track 241 extending along the transverse Y; the trolley 25 is slidingly connected to the second track 241 to be able to move with the first moving frame 24 and move relative to the first moving frame 24 along the transverse Y. The guide pipe 22 is installed on the trolley 25 through the constraint mechanism 26 to move with the trolley 25. The guide pipe 22 is arranged along the vertical direction Z and can be lifted relative to the constraint mechanism 26 along the vertical direction, so that when the guide pipe 22 is lowered, the bottom end 221 of the guide pipe extends into the space between the pile foundations 11, and when the guide pipe 22 is raised, the bottom end 221 of the guide pipe is withdrawn to a position above the top 12 of the pile foundation; the vertical direction Z is approximately perpendicular to the longitudinal X and the transverse Y, respectively. During the lifting of the guide pipe 22, the constraint mechanism 26 can limit the lifting direction of the guide pipe 22. The cutter head 21 is connected to the bottom end 221 of the guide pipe for sand suction operation between the pile foundations 11. The lifting assembly 27 is used to drive the guide pipe 22 to lift to regulate the operation height of the cutter head 21 for sand suction operation between the pile foundations 11.

[0067] The cutter suction system 2 is capable of being erected on the top of the wharf pile foundation 12 through the first track 23; the guide pipe 22 is erected on the first track 23 through the support of the trolley 25 and the first moving frame 24; the cutter head 21 is connected to the bottom of the guide pipe 22 and is driven to rise and fall through the lifting assembly 27, so that the cutter head 21 can be extended into the space between the pile foundations 11 to perform sand suction work, thereby realizing the backfilling of sand between the wharf piles and the excavation of the compacted original sand (original sand layer), with high excavation efficiency and low construction risk. In addition, the cutter suction system 2 can realize the adjustment of the working position of the cutter head 21 through the movement of the first moving frame 24 along the first track 23 and the movement of the trolley 25 along the second track 241; the adjustment of the working height of the cutter head 21 can be realized through the lifting of the guide pipe 22 driven by the lifting assembly 27, so as to facilitate the control of the excavation precision. The cutter suction system 2 provided by the embodiment has a simple structure and is convenient to build and remove.

[0068] As shown in FIGS. 2-4 and 6, in an embodiment, the second track 241 is two, and the part of the first moving frame 24 between the two second tracks 241 forms a first working window 101 penetrating the first moving frame 24 in the vertical direction Z. The trolley 25 includes a second moving frame 251, which is erected between the two second tracks 241 and is limited to move within the range of the first working window 101; the second moving frame 251 is formed with a second working window 102 penetrating the second moving frame 251 in the vertical direction Z, and the first and second working windows are connected (or the second working window 102 is part of the first working window 101). The restraint mechanism 26 includes a restraint frame 261 sleeved on the guide pipe 22 to constrain the lifting direction of the guide pipe 22, and the restraint frame 261 is installed in the second working window 102, so that the guide pipe 22 is limited in the second working window 102 and moves together with the second moving frame 251 within the range of the first working window 101. By assembling the trolley 25, the restraint mechanism 26 and the guide pipe 22 on the first moving frame 24, the overall structure is stable, which can ensure the stable movement of the trolley 25 driving the guide pipe 22 within the space range defined by the first working window 101 of the first moving frame 24, so as to ensure the stability of the cutter head 21 during work.

[0069] In order to avoid the trolley 25 from being separated from the second track 241 of the first moving frame 24 when the trolley 25 moves along the second track 241, the bottom of the second moving frame 251 of the trolley 25 is provided with a first sliding block 252 and a limiting sliding block 253 corresponding to the first sliding block 252, as shown in FIG. 5. The first sliding block 252 is in sliding fit with the top surface of the second track 241, the limiting sliding block 253 is detachably connected with the second moving frame 251, one side of the limiting sliding block 253 extends to below the first sliding block 252 to form a limiting groove 256 for clamping the second track edge 2411 between the limiting sliding block 253 and the first sliding block 252. Through the above arrangement, the second track edge 2411 is clamped in the limiting groove 256, which can prevent the trolley 25 from being separated from the second track 241 and improve the structural stability. In an embodiment, the second track 241 is an I-beam, the first sliding block 252 is located on the top surface of the I-beam, and the limiting groove 256 clamps the wing plate (i.e. the second track edge 2411) on the upper part of the I-beam. It should be noted that the contact between the first sliding block 252, the limiting sliding block 253 and the second track 241 is provided with a Huolong plate to reduce the frictional resistance.

[0070] For the driving mode of the first moving frame 24 moving along the first track 23, in an embodiment, the bottom of the first moving frame 24 is provided with a walking wheel 242 in rolling fit with the first track 23, and the walking wheel 242 is connected with a longitudinal moving driving motor 243 for driving the walking wheel 242 to rotate to drive the first moving frame 24 to move longitudinally, as shown in FIG. 2. The walking wheel 242 is driven to roll along the first track 23 by the motor 243, thereby realizing the longitudinal movement of the first moving frame 24 along the first track 23.

[0071] For the driving mode of the trolley 25 moving along the second track 241 of the first moving frame 24, in an embodiment, as shown in FIG. 3, a transverse moving driving assembly 244 for driving the trolley 25 to move transversely is connected between the second moving frame 251 and the first moving frame 24, including a transverse moving traction winch 2441, a transverse moving traction rope 2442, a first transverse moving guide wheel 2443 and a second transverse moving guide wheel 2444; wherein the transverse moving traction winch 2441 is installed on the first moving frame 24; the first moving frame 24 has a transverse first end and a transverse second end at two ends in the transverse direction Y; the first transverse moving guide wheel 2443 and the second transverse moving guide wheel 2444 are respectively installed on the transverse first end and the transverse second end of the first moving frame 24; the middle part of the transverse moving traction rope 2442 is wound on the transverse moving traction winch 2441, and the two free ends thereof are connected to the second moving frame 251 after passing through the first transverse moving guide wheel 2443 and the second transverse moving guide wheel 2444 respectively. By rotating the transverse moving traction winch 2441 to tighten the part of the transverse moving traction rope 2442 wound on the first transverse moving guide wheel 2443 while loosening the part of the transverse moving traction rope 2442 wound on the second transverse moving guide wheel 2444, the second moving frame 251 of the trolley 25 can be driven to move transversely towards the first transverse moving guide wheel 2443; by reversely rotating the transverse moving traction winch 2441 to tighten the part of the transverse moving traction rope 2442 wound on the second transverse moving guide wheel 2444 while loosening the part of the transverse moving traction rope 2442 wound on the first transverse moving guide wheel 2443, the second moving frame 251 of the trolley 25 can be driven to move transversely towards the second transverse moving guide wheel 2444.

[0072] In order to reduce the moving frequency of the first moving frame 24, the sand suction work in a larger range is completed in one movement of the first moving frame 24, as shown in FIGS. 6-10, the second moving frame 251 includes a top frame 2511 located at the top and a bottom frame 2512 located at the bottom. The top of the top frame 2511 is formed with two track surfaces 2513 extending in the longitudinal direction X, respectively close to the two opposite side edges 1021 of the second working window 102 in the transverse direction Y; the constraint frame 261 is provided with a lap joint block 263 on the two opposite side outer walls 2611 in the transverse direction Y, which is lap jointed on the track surface 2513, and the lap joint block 263 and the track surface 2513 are in sliding fit, so that the constraint frame 261 can move in the longitudinal direction X relative to the second moving frame 251 within the second working window 102. The top frame 2511 is provided with a first sliding groove 2514 extending in the longitudinal direction X on the two opposite side inner walls 2516 in the transverse direction Y, and the constraint frame 261 is provided with a second sliding block 264 in sliding fit with the first sliding groove 2514 on the two opposite side outer walls 2517 in the transverse direction; the bottom frame 2512 is provided with a second sliding groove 2515 extending in the longitudinal direction X on the two opposite side inner walls 2518 in the transverse direction, and the constraint frame 261 is provided with a third sliding block 265 in sliding fit with the second sliding groove 2515 on the two opposite side outer walls 2519 in the transverse direction. In this embodiment, through the cooperation of the lap joint block 263 and the track surface 2513, the cooperation of the second sliding block 264 and the first sliding groove 2514, and the cooperation of the third sliding block 265 and the second sliding groove 2515, the movement of the constraint frame 261 in the longitudinal direction X relative to the second moving frame 251 of the trolley 25 within the second working window 102 is realized. After the first moving frame 24 is moved to the position once, the movement of the constraint frame 261 in the longitudinal direction X relative to the second moving frame 251 within the second working window 102 enables the constraint frame 261 to drive the guide pipe 22 and the cutter suction head 21 to move longitudinally within the range surrounded by the first working window 101 and the second working window 102, so that the sand suction work in a larger range is completed in one movement of the first moving frame 24, and the moving frequency of the first moving frame 24 is reduced. In addition, the constraint frame 261 is lap jointed on the top frame 2511 of the second moving frame 251 by the lap joint block 263, so as to bear the weight of the guide pipe 22 and the constraint frame 261, which is conducive to improving the stability. It should be noted that the top frame 2511 and the bottom frame 2512 are both I-beams; the top surface of the I-beam of the top frame 2511 forms the track surface 2513, and the first sliding groove 2514 is formed between the upper and lower flanges of the I-beam; the second sliding groove 2515 is formed between the upper and lower flanges of the I-beam of the bottom frame 2512. The contact between the second sliding block 264 and the first sliding groove 2514 in sliding fit, and the contact between the third sliding block 265 and the second sliding groove 2515 in sliding fit, are both provided with a Huolong plate to reduce the frictional resistance.

[0073] For the driving mode of the movement of the constraint frame 261 relative to the second moving frame 251 of the trolley 25, in an embodiment, as shown in FIG. 8, a longitudinal movement driving assembly 254 for driving the movement of the constraint frame 261 in the second working window 102 is connected between the second moving frame 251 and the constraint frame 261, including a longitudinal movement traction winch 2541, a longitudinal movement traction rope 2542, a first longitudinal movement guide wheel 2543, and a second longitudinal movement guide wheel 2544; wherein the longitudinal movement traction winch 2541 is installed on the second moving frame 251; the two ends of the second moving frame 251 in the longitudinal direction X are a longitudinal first end and a longitudinal second end, respectively; the first longitudinal movement guide wheel 2543 and the second longitudinal movement guide wheel 2544 are installed on the longitudinal first end and the longitudinal second end of the second moving frame 251, respectively; the middle part of the longitudinal movement traction rope 2542 is wound on the longitudinal movement traction winch 2541, and the two free ends thereof are connected to the constraint frame 261 after passing through the first longitudinal movement guide wheel 2543 and the second longitudinal movement guide wheel 2544, respectively. By rotating the longitudinal movement traction winch 2541 to tighten the part of the longitudinal movement traction rope 2542 wound on the first longitudinal movement guide wheel 2543 while loosening the part of the longitudinal movement traction rope 2542 wound on the second longitudinal movement guide wheel 2544, the constraint frame 261 can be driven to move longitudinally towards the direction close to the first longitudinal movement guide wheel 2543; by reversing the rotation of the longitudinal movement traction winch 2541 to tighten the part of the longitudinal movement traction rope 2542 wound on the second longitudinal movement guide wheel 2544 while loosening the part of the longitudinal movement traction rope 2542 wound on the first longitudinal movement guide wheel 2543, the constraint frame 261 can be driven to move longitudinally towards the direction close to the second longitudinal movement guide wheel 2544.

[0074] In order to ensure the verticality of the guide pipe 22 during lifting, in an embodiment, as shown in FIGS. 11-13, the outer wall of the guide pipe 22 is provided with a guide rail 222 extending in the vertical direction Z; the side of the constraint frame 261 facing the guide rail 222 is provided with a limiting guide groove 262, the guide rail 222 is accommodated in the limiting guide groove 262, and the groove wall of the limiting guide groove 262 and the outer wall of the guide rail 222 are in sliding fit. Through the sliding fit of the guide rail 222 and the limiting guide groove 262, the lifting of the guide pipe 22 in the vertical direction Z is ensured. In an embodiment, in order to ensure the verticality of the guide pipe 22, there are at least two guide rails 222, which are symmetrically arranged on the opposite sides of the guide pipe 22, so that at least two limiting guide grooves 262 extending in the vertical direction are correspondingly arranged and matched with each guide rail 222. The limiting guide groove 262 matched with each guide rail 222 can be one guide groove extending in the vertical direction, or at least two sub-guide grooves arranged in segments and in alignment, among which two sub-guide grooves 262 are arranged close to the top and the bottom of the constraint frame 261, respectively.

[0075] For the lifting driving mode of the guide pipe 22, as shown in FIG. 11, the lifting assembly 27 includes a lifting traction winch 271, a lifting traction rope 272 wound on the lifting traction winch 271, and a fixed pulley 273; wherein the lifting traction winch 271 is installed on the restraint frame 261 and located at one side of the guide pipe 22, and the fixed pulley 273 is installed on the outer wall of the bottom end 221 of the guide pipe; the free end of the lifting traction rope 272 is tied to the restraint frame 261 after winding around the fixed pulley 273. By using the lifting assembly 27, the lifting control is facilitated, and the excavation accuracy is ensured. During work, the traction rope 272 is released by the winch 271, which can drive the guide pipe 22 to descend, and the traction rope 272 is tightened, which can drive the guide pipe 22 to ascend.

[0076] In addition, the cutter suction head 21 in the embodiment can adopt a conventional cutter suction head in the art; the technical features of connecting the cutter suction head 21 to the cutter suction power system through a pipeline are well known in the art, and will not be described here.

[0077] The second embodiment of the present application provides a method for excavating and sand suction between wharf piles (hereinafter referred to as the sand suction method), which can use the cutter suction system 2 described in any of the preceding embodiments to excavate and sand suction between wharf piles; the sand suction method comprises the following steps:

[0078] S101 cutter suction preparation: after the cutter suction system 2 is erected on the top 12 of the constructed wharf pile foundation, the guide pipe 22 is raised to a position above the pile foundation 11, and the cutter suction head 21 is connected to the cutter suction power system;

[0079] S102 cutter suction head positioning: the first moving frame 24 is moved along the longitudinal direction X to the first end of the longitudinal direction of the wharf, the trolley 25 is moved along the transverse direction to one end of the first moving frame 24 in the transverse direction, and the guide pipe 22 is lowered by the lifting assembly 27 to make the cutter suction head 21 extend into the position to be excavated between the pile foundations 11;

[0080] S103 cutter suction sand suction: after the cutter suction head 21 is positioned, the cutter suction power system is started to drive the trolley 25 to move the cutter suction head 21 along the transverse direction Y step by step, while continuously sucking sand at the positions passed by the cutter suction head 21, to complete the excavation work of the current first work window of the first moving frame 24;

[0081] S104 moving operation: when the trolley 25 moves to the other end of the first moving frame 24 in the transverse direction, the excavation work of the current first work window is completed; the first moving frame 24 is driven to move along the longitudinal direction X to the next adjacent first work window;

[0082] S105 repeated operation: repeat steps S103 and S104 until the first moving frame 24 moves to the second end of the longitudinal direction of the wharf opposite to the first end, to complete the excavation work between the pile foundations 11 below the wharf.

[0083] S106 Recovering the cutter head: lifting the guide pipe 22 by the lifting assembly 27 to recover the cutter head 21 to a position above the top 12 of the pile foundation 11.

[0084] The sand suction method can realize the backfilling of sand in the pile space of the wharf and the excavation of the original sand by lowering the cutter head 21 to the pile space through the guide pipe 22 after erecting the cutter suction system 2 on the top 12 of the pile foundation of the wharf, and the construction risk is low. In addition, the continuous cutter suction excavation can be realized by the longitudinal movement of the first moving frame 24 and the transverse movement of the trolley 25, and the excavation efficiency is high. The lifting assembly 27 drives the guide pipe 22 to lift and lower to adjust the working height of the cutter head 21 in real time and control the excavation accuracy. At the same time, the lifting assembly 27 can control the working height of the cutter head 21 in real time to ensure that the cutter head 21 is always in a non-pressure state and avoid deformation of the cutter head 21 due to bearing.

[0085] It should be noted that when the first moving frame 24 or the trolley 25 is moved, if the guide pipe 22 cannot pass through due to the existence of the cross beam on the top 12 of the pile foundation of the wharf, the guide pipe 22 can be lifted by the lifting assembly 27 to recover the cutter head 21 to a position above the top 12 of the pile foundation, and then moved. After passing through the cross beam, the guide pipe 22 is lowered by the lifting assembly 27 to make the cutter head 21 extend to the position to be excavated between the pile foundations 11.

[0086] The third embodiment of the present application provides a wharf shore slope excavation construction method (hereinafter referred to as the construction method), which can be constructed by using the cutter suction system 2 of any of the preceding embodiments.

[0087] As shown in FIGS. 14 and 15, the cross section 3 to be excavated is located below the wharf 1 and at the front edge of the wharf 1; the cross section 3 to be excavated includes shallow backfill sand layers 31, remaining backfill sand layers 32 and original sand layers 33 which are sequentially distributed in the vertical direction Z, wherein the shallow backfill sand layers 31 are located at the uppermost position and are divided into a first shallow backfill sand layer 311 located at the front edge of the wharf and a second shallow backfill sand layer 312 located between the pile space under the beam of the wharf, which are adjacent to each other along the horizontal direction Y; the remaining backfill sand layers 32 are divided into a first remaining backfill sand layer 321 located at the front edge of the wharf and a second remaining backfill sand layer 322 located between the pile space under the beam of the wharf, which are adjacent to each other along the horizontal direction Y; and the original sand layers 33 are divided into a first original sand layer 331 located at the front edge of the wharf and a second original sand layer 332 located between the pile space under the beam of the wharf, which are adjacent to each other along the horizontal direction Y.

[0088] The construction method includes the following steps:

[0089] S201 shallow backfill sand layer excavation: excavator 401 is used to excavate the first shallow backfill sand layer 311 of the section 3, and then excavate the second shallow backfill sand layer 312;

[0090] S202 remaining backfill sand layer excavation: the first remaining backfill sand layer 321 is excavated by using the sand pumping ship 402, and the second remaining backfill sand layer 322 is excavated by using the diving sand pumping pump or double rope grab 403;

[0091] S203 original sand layer excavation: the first original sand layer 331 is excavated by using the cutter suction dredger 404, and the second original sand layer 332 is excavated by using the cutter suction system 2 mounted on the top 12 of the pile foundation of the wharf 1 until the design elevation is reached, forming the shore slope.

[0092] The construction method divides the shore slope excavation of the "island first, then back-dredging" wharf into three stages; for different sand layers and areas of the section 3 to be excavated, multiple excavation methods are used to cooperate with construction, realizing efficient excavation of the shore slope of the "island first, then back-dredging" wharf with small construction risk.

[0093] As shown in FIGS. 15 and 16, in the S201 step, a long-arm excavator 401 is used throughout the process on land; by excavating from front to back, the excavator 401 can provide stable land support space, enabling the entire excavation process to be carried out on land, greatly reducing the difficulty of excavation and construction risk. When the first shallow backfill sand layer 311 is excavated, the slope sand bag is excavated first, and then the backfill sand layer is excavated. The excavated backfill sand layer is backfilled to the stockyard area behind the wharf 1 by a self-unloading truck. Preferably, in the S201 step, the shallow backfill sand layer 31 is excavated to a height range of +2.0m to -1.0m (the height reference surface is Chart Datum sea chart reference surface); excavating too deep may cause collapse, causing the excavator 401 to sink into the excavation area, resulting in construction risk.

[0094] As shown in FIG. 17, in the S202 step, the first remaining backfill sand layer 321 is excavated by the sand suction ship 402, which is performed at sea and has no limit on the operation area. In addition, because the density of the backfill sand layer is lower than that of the original sand layer, the sand suction ship 402 can efficiently complete the excavation operation with low energy consumption. During the excavation, the pump in the sand suction ship 402 sucks the sand-water mixture into the sand suction pipe, and then the sand-water mixture is discharged to the designated area of the stockpile after being forced by the booster pump. For the second remaining backfill sand layer 322, the diving sand suction pump or the double-rope grab 403 can be placed in the shallow water area between the piles under the pier 1 beam to perform the excavation construction (which can be regarded as land construction). It should be noted that the diving sand suction pump is placed in the shallow water area to be excavated during operation and cannot be exposed to the water surface. When the pump is stopped, it needs to be raised to the water layer for 5 minutes. When the outlet is blocked, manual cleaning is required before the pump can be started. The sand suction pump cannot directly contact the sand layer and must have a gap of 100-500 mm. The double-rope grab 403 can be used in combination with the crawler crane 405 during excavation.

[0095] In order to shorten the excavation construction period, as shown in FIG. 17, in the S202 step, the excavation of the first and second remaining backfill sand layers is performed in multiple layers from top to bottom, and the total number of layers of the two excavations is the same. During the excavation construction, the excavation progress of the first remaining backfill sand layer 321 is one layer earlier than that of the second remaining backfill sand layer 322. In this way, the excavation construction period can be greatly shortened under the premise of ensuring construction safety. It should be noted that the overlap width between the excavation construction area of the first remaining backfill sand layer 321 and the excavation construction area of the second remaining backfill sand layer 322 is at least 5 m. It should be noted that the overlap here refers to the fact that the separation surface of the two construction areas is inclined to achieve the overlap of the first remaining backfill sand layer 321 excavation construction area on the upper layer and the second remaining backfill sand layer 322 excavation construction area on the lower layer.

[0096] It should be further noted that in the S202 step, the elevation range of the excavated remaining backfill sand layer is -1.0 m to -8.0 m (the elevation reference surface is Chart Datum, the chart reference surface). If the remaining backfill sand layer is excavated too deeply, it may reach the dense original sand layer. The excavation efficiency of the sand suction ship 402, the diving sand suction pump, and the double-rope grab 403 is low, and the water depth is too large, so the diving sand suction pump cannot work normally, and the double-rope grab 403 cannot take out the excavated sand and stones.

[0097] As shown in FIG. 18, in the S203 step, the first original sand layer 331 is excavated by the cutter suction dredger 404, which is performed at sea and has no limitation on the working face. During the excavation, the cutter head of the cutter suction dredger 404 is used to loosen the original sand layer at the bottom of the sea to make it flowable, and then the pump in the cutter suction dredger 404 is used to suck the mixture of sand and water into the sand suction pipe, and after the force of the booster pump is added, the sand-water mixture is discharged to the designated area of the stockyard. It should be noted that the safety distance between the cutter head of the cutter suction dredger 404 and the pile foundation 11 of the wharf 1 is not less than 10 m, so as to avoid disturbing the pile foundation 11. For the second original sand layer 332, the cutter suction system 2 mounted on the top 12 of the pile foundation of the wharf 1 is used to excavate the original sand layer between the piles, taking the pile top as the platform. It should be noted that in the original sand layer excavation step, the original sand layer to be excavated has a height range of -8.0 m to -17.9 m (the height reference surface is the Chart Datum sea chart reference surface); if the original sand layer is excavated too deeply, the stability of the wharf 1 may be affected.

[0098] In order to shorten the excavation construction period, as shown in FIG. 18, in the S203 step, the excavation of the first and second original sand layers is performed in multiple layers from top to bottom, and the total number of layers of the two is the same. During the excavation construction, the excavation progress of the first original sand layer 331 is one layer earlier than that of the second original sand layer 332. In this way, the excavation construction period can be greatly shortened under the premise of ensuring construction safety. It should be noted that the overlap width between the excavation construction area of the first original sand layer 331 and the excavation construction area of the second original sand layer 332 is at least 5 m. It should be noted that the overlap between the two construction areas is that the separation surface of the two construction areas is inclined to achieve the overlap of the first original sand layer 331 excavation construction area on the upper layer and the second original sand layer 332 excavation construction area on the lower layer.

[0099] The wharf 1 is divided into multiple sections 6 for excavation, and each section (each section 6) is excavated by the S201-S203 steps. In addition, in order to control the excavation accuracy, the construction method further includes an S204 shore slope excavation acceptance step, which is specifically: after each shore slope excavation is completed, the excavation depth is checked, wherein the excavation depth of the construction area between the piles under the beams of the wharf 1 is checked by a leadline, and the excavation depth of the construction area at the front of the wharf 1 is checked by a single-beam depth sounder; when over-excavation is detected, sand bags are immediately thrown to find the slope; when the design elevation and design slope are not reached, a sand suction pump (not shown in the figure) is used to locally repair the slope; in addition, for the loose sand area that is difficult to form a design slope during excavation, sand bags are thrown to find the slope to meet the design slope requirement.

[0100] Finally, it should be noted that: the various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be referred to each other.

[0101] The embodiments described above are merely preferred embodiments of the present application, and are not intended to limit the scope of the present application. Any modification and improvement made by those skilled in the art to the technical solutions of the present application without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A cutter suction system for a wharf pile opening excavation, in which a length direction of the wharf is a longitudinal direction and a width direction is a transverse direction, wherein, The cutter suction system comprises: two first tracks arranged in parallel with each other, each first track extending in the longitudinal direction and arranged on top of a plurality of pile foundations arranged in the longitudinal direction; a first moving frame arranged between the two first tracks in the transverse direction, the first moving frame being slidingly connected to the first tracks to move in the longitudinal direction, the first moving frame being provided with a second track extending in the transverse direction; a trolley slidingly connected to the second track of the first moving frame to move with the first moving frame and move relative to the first moving frame in the transverse direction; a guide pipe mounted on the trolley by a restraint mechanism to move with the trolley, the guide pipe being arranged in the vertical direction and being capable of lifting relative to the restraint mechanism in the vertical direction, so that the bottom end of the guide pipe extends into the space between the pile foundations when the guide pipe is lowered, and the bottom end of the guide pipe is withdrawn to a position above the top of the pile foundations when the guide pipe is raised, the restraint mechanism being configured to limit the lifting direction of the guide pipe during the lifting of the guide pipe; a cutter head connected to the bottom end of the guide pipe for sand suction work between the pile foundations; and a lifting assembly configured to drive the lifting of the guide pipe to regulate the working height of the cutter head for sand suction work between the pile foundations.

2. The reamer system of claim 1, wherein, The second track is two, and the part of the first moving frame between the two second tracks forms a first working window penetrating the first moving frame in the vertical direction; the trolley comprises a second moving frame arranged between the two second tracks and limited to move within the first working window; the second moving frame is formed with a second working window penetrating the second moving frame in the vertical direction, the second working window being in communication with the first working window; the restraint mechanism comprises a restraint frame sleeved on the outside of the guide pipe to restrict the lifting direction of the guide pipe, the restraint frame being mounted in the second working window to limit the guide pipe in the second working window and move with the second moving frame within the first working window.

3. The cutter suction system of claim 2, wherein, The outer wall of the guide pipe is provided with a guide rail extending in the vertical direction, the side of the restraint frame facing the guide rail is provided with a limiting guide groove, the guide rail is accommodated in the limiting guide groove to realize the sliding fit in the vertical direction; the bottom of the second moving frame is provided with a first sliding block and a limiting sliding block; the first sliding block is slidingly fitted with the top surface of the second track, the limiting sliding block is detachably connected with the second moving frame, and one side of the limiting sliding block extends below the first sliding block to form a limiting groove for clamping the edge of the second track between the limiting sliding block and the first sliding block.

4. The reamer system of claim 2 or 3, wherein, The bottom of the first moving frame is provided with a traveling wheel rolling with the first track, and the traveling wheel is connected with a longitudinal moving drive motor for driving the traveling wheel to rotate to drive the first moving frame to move in the longitudinal direction; A transverse movement driving assembly is connected between the second moving frame and the first moving frame for driving the trolley to move transversely, the transverse movement driving assembly comprises a transverse traction winch, a transverse traction rope and two transverse guide wheels, the transverse traction winch is installed on the first moving frame, the two transverse guide wheels are respectively installed on the opposite ends of the first moving frame in the transverse direction, the middle part of the transverse traction rope is wound on the transverse traction winch, and the two free ends of the transverse traction rope are connected to the second moving frame after passing through the two transverse guide wheels. The lifting assembly comprises a lifting traction winch, a lifting traction rope wound on the lifting traction winch, and a fixed pulley, the lifting traction winch is installed on the constraint frame, the fixed pulley is installed on the bottom end of the guide pipe, and the free end of the lifting traction rope is connected to the constraint frame after passing through the fixed pulley.

5. The reamer system of claim 2 or 3, wherein, The second moving frame comprises a top frame located at the top and a bottom frame located at the bottom, the top of the top frame is formed with two track surfaces extending in the longitudinal direction, the two track surfaces are respectively close to the opposite side edges of the second working window in the transverse direction, the constraint frame is provided with clamping blocks clamping on the track surfaces on the opposite side outer walls in the transverse direction, the clamping blocks are in sliding fit with the track surfaces, so that the constraint frame moves relative to the second moving frame in the longitudinal direction in the second working window, the top frame is provided with first sliding grooves extending in the longitudinal direction on the opposite side inner walls in the transverse direction, and the constraint frame is provided with second sliding blocks in sliding fit with the first sliding grooves on the opposite side outer walls in the transverse direction, and the bottom frame is provided with second sliding grooves extending in the longitudinal direction on the opposite side inner walls in the transverse direction, and the constraint frame is provided with third sliding blocks in sliding fit with the second sliding grooves on the opposite side outer walls in the transverse direction.

6. The cutter suction system of claim 5, wherein, A longitudinal movement driving assembly is connected between the constraint frame and the second moving frame for driving the constraint frame to move in the second working window, the longitudinal movement driving assembly comprises a longitudinal traction winch, a longitudinal traction rope and two longitudinal guide wheels, the longitudinal traction winch is installed on the second moving frame, the two longitudinal guide wheels are respectively installed on the opposite ends of the second moving frame in the longitudinal direction, the middle part of the longitudinal traction rope is wound on the longitudinal traction winch, and the two free ends of the longitudinal traction rope are connected to the constraint frame after passing through the two longitudinal guide wheels.

7. A method of dredging sand between wharf piles, wherein, The suction dredging system is used to excavate and suck sand between piles of a wharf, and the sand suction method comprises the following steps: Suction dredging preparation: after the suction dredging system is erected on the top of the constructed pile foundation of the wharf, the suction head on the guide pipe is lifted to a position above the top of the pile foundation; Suction head positioning: the first moving frame is moved to the first end of the longitudinal direction of the wharf in the longitudinal direction, the trolley is moved to one end of the first moving frame in the transverse direction, and the guide pipe is lowered by the lifting assembly, so that the suction head is inserted into the position to be excavated between the pile foundations; cutter suction dredging: when the cutter head is in place, the trolley is driven to move the cutter head step by step in the lateral direction, while the cutter head continuously sucks sand at the position passed by the cutter head, to complete the excavation of the current first working window of the first moving frame; moving operation: when the trolley moves to the other end of the first moving frame in the lateral direction, the excavation of the current first working window is completed; the first moving frame is driven to move to the next adjacent first working window in the longitudinal direction; repeating operation: repeating the cutter suction dredging step and the moving operation step until the first moving frame moves to the second end of the wharf in the longitudinal direction opposite to the first end of the wharf, to complete the excavation between the pile foundations under the wharf; and recovery of the cutter head: the guide pipe is raised by the lifting assembly, so that the cutter head is recovered to a position above the top of the pile foundation.

8. A method for excavating a quay slope construction, capable of excavating a cross section formed by a backfilling island, the cross section comprising, in order from the vertical direction, a shallow backfill sand layer, a remaining backfill sand layer, and an original sand layer, wherein, The shallow backfill sand layer is located at the uppermost position and is divided into a first shallow backfill sand layer located at the front edge of the wharf and a second shallow backfill sand layer located between the piles under the wharf beam, which are distributed adjacent to each other in the lateral direction; the remaining backfill sand layer is divided into a first remaining backfill sand layer located at the front edge of the wharf and a second remaining backfill sand layer located between the piles under the wharf beam, which are distributed adjacent to each other in the lateral direction; the original sand layer is divided into a first original sand layer located at the front edge of the wharf and a second original sand layer located between the piles under the wharf beam, which are distributed adjacent to each other in the lateral direction; wherein the construction method comprises the following steps: shallow backfill sand layer excavation: a first shallow backfill sand layer of the section is excavated by the excavator first, and then a second shallow backfill sand layer is excavated; remaining backfill sand layer excavation: the first remaining backfill sand layer is excavated by the sand pumping ship, and the second remaining backfill sand layer is excavated by the diving sand pumping pump or the double-rope grab; original sand layer excavation: the first original sand layer is excavated by the cutter suction dredger, and the second original sand layer is excavated by the cutter suction system mounted on the top of the wharf pile foundation until the design elevation is reached, forming a shore slope; wherein the cutter suction system is the cutter suction system of any one of claims 1-6.

9. The construction method of claim 8, wherein, The first and second shallow backfill sand layers removed have a range of +2.0m to -1.0m in elevation; the first and second remaining backfill sand layers removed have a range of -1.0m to -8.0m in elevation; and the first and second original sand layers removed have a range of -8.0m to -17.9m in elevation.

10. The construction method according to claim 8 or 9, wherein, The remaining backfill sand layer excavation step, the first and second remaining backfill sand layer excavation is from top to bottom into multiple layers, the first remaining backfill sand layer excavation total layer number and the second remaining backfill sand layer excavation total layer number are same;Excavation construction, the first remaining backfill sand layer excavation progress is earlier than the second remaining backfill sand layer excavation progress by one layer;The original sand layer excavation step, the first and second original sand layer excavation is from top to bottom into multiple layers, the first original sand layer excavation total layer number and the second original sand layer excavation total layer number are same;Excavation construction, the first original sand layer excavation progress is earlier than the second original sand layer excavation progress by one layer;Wherein, the first remaining backfill sand layer and the second remaining backfill sand layer overlap width is at least 5m;The first original sand layer and the second original sand layer overlap width is at least 5m.

11. The construction method according to claim 8 or 9, wherein It also includes bank slope excavation acceptance step: after bank slope excavation is completed, check the excavation depth, wherein the construction area between the pile under the wharf beam is checked by the leadline, and the construction area in front of the wharf is checked by the single-beam depth finder;When over-excavation is detected, immediately fill sand bags to find slope;When the design elevation and design slope are not reached, use the sand pump to locally repair the slope;For the loose sand area in the excavation process, fill sand bags to find slope to meet the design slope requirement.

Images