A dredging device suitable for space-constrained environments and a construction method thereof

Abstract

The present invention discloses a dredging device suitable for a space-constrained environment, comprising: a mud barrel, which is a hollow structure with upper and lower openings; a flap door, which is arranged at the lower opening of the mud barrel, including two symmetrically arranged door panels, which are hinged to a rotating shaft, and the two ends of the rotating shaft are connected to the inner wall of the mud barrel; two guide wheels, which are respectively fixed to the inside of the mud barrel and the side wall of the mud barrel through brackets; a steel wire rope, one end of which is fixed to a crawler crane, and the other end passes through the two guide wheels in sequence and is fixed to the free ends of the two door panels; a weight block, which is fixed to the top of the mud barrel through a steel support, and a lifting lug is provided on the top surface. The present invention also discloses a construction method of the dredging device suitable for a space-constrained environment. The present invention completes the process of grabbing and unloading mud by lifting and lowering the steel wire rope to control the opening and closing of the flap door. The device has a simple structure, and the inner diameter of the mud barrel can be adjusted according to the construction space to be suitable for a construction environment with limited space, and the mud grabbing efficiency can be ensured.

Description

Technical Field

[0001] The present invention relates to the field of dredging devices, and more specifically, to a dredging device suitable for a space-constrained environment and a construction method thereof. Background Art

[0002] In projects that require underwater support structure construction in artificial lakes, rivers, reservoirs, seashores, ports, etc., there is a requirement to bury the lower structure in the silt, so the underwater silt needs to be cleared to the designed elevation during the construction process. Due to the terrain conditions and construction conditions, some areas to be desilted are small, or there are various support structures in the construction area, resulting in a small available area for desilting construction, and it is impossible to use large-scale, high-efficiency desilting equipment to grab the mud.

[0003] At present, air compressors and high-pressure water pumps are commonly used to grab mud by jetting water. This method is inefficient and costly, which reduces the overall construction efficiency and leads to slow construction progress. In view of the above problems, it is necessary to provide a dredging device that can be used in space-constrained environments while ensuring dredging efficiency, so as to improve construction efficiency and reduce construction costs. Summary of the invention

[0004] The purpose of the present invention is to provide a dredging device suitable for a space-constrained environment and a construction method thereof. The device is pressed into the silt by its own gravity to realize the mud grabbing function, and the opening and closing of the flap door is controlled by lifting and lowering the wire rope to complete the mud grabbing and unloading process. The device has a simple structure and can adjust the inner diameter of the mud loading barrel according to the construction space to adapt to the construction environment with limited space and ensure the mud grabbing efficiency.

[0005] In order to achieve these purposes and other advantages according to the present invention, a dredging device suitable for a space-constrained environment is provided, comprising:

[0006] A mud-filling barrel, which is a hollow structure with upper and lower openings;

[0007] A flap door is provided at the lower opening of the mud loading barrel, the flap door comprises two door panels which are symmetrically arranged, the adjacent two sides of the two door panels are hinged to a rotating shaft, the two ends of the rotating shaft are fixedly connected to the inner side wall of the mud loading barrel, and the two door panels are arranged to close the lower opening when they are in a horizontal position;

[0008] Two guide wheels, which are guide wheel 1 fixed to the upper part of the mud loading barrel through a bracket and guide wheel 2 fixed to the side wall of the mud loading barrel;

[0009] A steel wire rope 1, one end of which is fixed on the crawler crane, and the other end of which passes through the guide wheel 2 and the guide wheel 1 in sequence, and is divided into two bundles and respectively fixed to the free ends of the two door panels;

[0010] A ballast block, which is fixed to the top of the mud-loading barrel by means of a steel support, and a lifting lug is provided on the top surface and / or side wall of the ballast block;

[0011] A vibration device is arranged on the top of the ballast block.

[0012] Preferably, in the dredging device suitable for space-constrained environments, a limit block 1 is provided on the upper surface of any door panel, which is arranged so that when the two door panels are pulled up to the highest point, the angle between the two door panels is 10°-20°.

[0013] Preferably, the dredging device suitable for a space-constrained environment further includes a limit column, which is fixed to the upper part of the mud loading barrel by a bracket, and the middle part of the limit column has a through hole penetrating up and down; a limit block 2 is provided on the steel wire rope 1, which is located below the limit column and fixedly connected to the steel wire rope 1; wherein the other end of the steel wire rope 1 passes through the guide wheel 2, the guide wheel 1 and the through hole in sequence and is connected to the flap door.

[0014] Preferably, in the dredging device suitable for a space-constrained environment, the centers of the rotating shaft, the second limit block, the through hole, the weight block and the vibration device are located on the center line of the mud loading barrel.

[0015] Preferably, in the dredging device suitable for space-constrained environments, the cross-sectional area of ​​the ballast block is less than 60% of the cross-sectional area of ​​the mud loading barrel.

[0016] Preferably, in the dredging device suitable for a space-constrained environment, the vibration device comprises: a watertight box fixed on the upper surface of the ballast block; and a vibrator fixed inside the watertight box.

[0017] Preferably, the dredging device suitable for a space-constrained environment further includes at least three fixed plates, which are evenly arranged on the outer wall of the bottom of the mud filling barrel along the outer circumference of the mud filling barrel, and any fixed plate includes a crossbeam, which is horizontally arranged and one end of which is fixed to the outer wall of the mud filling barrel; and a vertical plate, which is vertically arranged and fixedly connected to the other end of the crossbeam, and the bottom end of the vertical plate is located in the same horizontal plane as the bottom end of the mud filling barrel.

[0018] Preferably, the construction method of the dredging device suitable for a space-constrained environment comprises the following steps:

[0019] Step 1: connect the large hook of the crawler crane to the lifting lug through the steel wire rope 2 so that the dredging device suitable for a space-constrained environment is suspended on the water surface, pull the steel wire rope 1 with the small hook of the crawler crane so that the two door panels are in a horizontal position, select a standard point on the steel wire rope 2 and mark it, and make a mark 1 on the steel wire rope 1, and the mark 1 and the standard point are located in the same horizontal plane;

[0020] Step 2: Use the small hook to vertically lift the steel wire rope 1. When the two door panels are pulled up to the highest point, make a mark 2 on the steel wire rope 1. The mark 2 and the standard point are located at the same horizontal plane.

[0021] Step 3, horizontally rotating the crawler crane, moving the dredging device suitable for a space-constrained environment to just above the location to be dredged, and simultaneously lowering the large hook and the small hook;

[0022] Step 4: When the steel wire rope 2 becomes loose, the lowering of the large hook and the small hook is stopped, and the depth of the mud-filling barrel into the mud is calculated according to the relative displacement between the standard point and the water surface;

[0023] Step 5: If the dredging depth is greater than or equal to the specified dredging depth or mud barrel length, lower the small hook until the mark 1 is on the same horizontal plane as the standard point, and then simultaneously lift the large hook and the small hook;

[0024] If the mud entry depth is less than the specified dredging depth and mud loading tube length, the vibration device is started, and after the second steel wire rope is tightened, the large hook and the small hook are lowered synchronously until the mud entry depth reaches the requirement, the large hook is stopped, and the small hook is lowered until the mark 1 and the standard point are on the same horizontal plane, and then the large hook and the small hook are raised synchronously;

[0025] Step 6: Use the crawler crane to lift the dredging device suitable for a space-constrained environment above the water surface, move it to a designated mud unloading point, lower the steel wire rope 1 separately, and pour out the mud in the mud barrel;

[0026] Step 7. After confirming that the sludge in the sludge barrel has been cleaned, lift the wire rope 1 so that the mark 2 and the standard point are located at the same horizontal plane, and then repeat the contents of steps 3 to 6 until the sludge in the construction area is cleaned to the specified dredging depth.

[0027] Preferably, in the construction method of the dredging device suitable for a space-constrained environment, the standard point is located above the water surface during the entire construction process.

[0028] Preferably, in the construction method of the dredging device suitable for a space-constrained environment, the prescribed dredging depth is equal to the dredging depth plus the height of the door panel in the vertical position.

[0029] The present invention has at least the following beneficial effects:

[0030] 1. The present invention presses the mud-loading barrel into the mud by the pressure of the weight block to achieve mud grabbing, and has low requirements on the construction space. The inner diameter of the mud-loading barrel can be adjusted according to the size of the space available for actual construction, so that the device can be used for dredging construction in a space-constrained environment, and has a wide range of applications.

[0031] 2. The internal structure of the mud barrel is simple, there is no power device inside, and it is connected to the outside through a wire rope. When a fault occurs, the fault location can be quickly determined, and it is easy to replace and repair accessories.

[0032] 3. The whole device only includes a power device located on the top, and the other parts are completely connected through mechanical structures. There is no need to purchase other large equipment, and it works more stably and is not prone to failure. Compared with commonly used dredging devices such as air compressors and water pumps, the construction method is simple and easy to operate, which can reduce construction costs while ensuring construction efficiency.

[0033] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of a dredging device suitable for a space-constrained environment according to an embodiment of the present invention;

[0035] Figure 2 It is a front view of the fixing plate described in the above embodiment;

[0036] Figure 3 is a side view of the fixing plate described in the above embodiment;

[0037] Figure 4 It is a top view of the fixing plate described in the above embodiment. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0039] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] like Figure 1-4 As shown, the present invention provides a dredging device suitable for a space-constrained environment, comprising:

[0041] A mud loading tube 1, which is a hollow structure with upper and lower openings;

[0042] A flap door 3 is provided at the lower opening of the mud loading barrel 1. The flap door 3 includes two door panels, which are symmetrically arranged. The adjacent two sides of the two door panels are hinged to a rotating shaft. The two ends of the rotating shaft are fixedly connected to the inner side wall of the mud loading barrel 1. The two door panels are arranged to close the lower opening when they are in a horizontal position.

[0043] Two guide wheels 7, which are guide wheel 1 fixed to the upper part of the mud barrel 1 through a bracket and guide wheel 2 fixed to the side wall of the mud barrel 1;

[0044] A steel wire rope 4, one end of which is fixed on the crawler crane 8, and the other end of which passes through the guide wheel 2 and the guide wheel 1 in sequence, and is divided into two bundles and respectively fixed to the free ends of the two door panels;

[0045] A ballast block 13, which is fixed to the top of the mud loading barrel 1 through a steel support, and a lifting lug 9 is provided on the top surface and / or side wall of the ballast block 13;

[0046] A vibration device is arranged on the top of the ballast block 13 .

[0047] In the above technical solution, the shape of the mud barrel 1 is preferably a cylinder, and correspondingly, the two door panels are semicircular panels, and the diameter of the door panels is slightly smaller than the diameter of the mud barrel 1 to prevent the door panels from contacting the inner wall of the mud barrel during opening and closing to cause jamming; since the silt is sticky, after the two door panels of the flap door are closed, the silt will not leak out from the gap between the door panels and the mud barrel. The rotating shaft is set along the diameter of the mud barrel, the center of the two door panels is located at the midpoint of the rotating shaft, and the wire rope 4 is connected to the two door panels respectively to form two connection points, and the connecting line of the two connection points is set along the diameter of the mud barrel and perpendicular to the rotating shaft. The steel wire rope 14 is vertically arranged between the crawler crane 8 and the guide wheel 2; the steel wire rope 14 has a bifurcation point just above the flap door, from which it is divided into two bundles and respectively fixed on the two door panels, and the steel wire rope 14 is vertically arranged between the guide wheel 1 and the bifurcation point; thus, the directions of the output end and the input end of the steel wire rope 1 are parallel, and when the crawler crane 8 is used alone to vertically lift the steel wire rope 14, the vertical displacement of the steel wire rope at one end of the crawler crane is equal to the actual height to which the door panel is pulled up.

[0048] The present invention realizes the mud grabbing function by pressing the device into the mud through the action of the weight block and the gravity of the device itself, controls the opening and closing of the flap door by lifting and lowering the wire rope, and cooperates with the crawler crane to synchronously lift and lower the entire device to complete the mud grabbing and unloading process. The device has a simple structure, and the inner diameter of the mud loading barrel can be adjusted according to the construction space to be suitable for the construction environment with limited space. Usually, the diameter of the mud loading barrel is designed according to the maximum diameter at the minimum constructible position of the construction area to ensure the construction efficiency. At the same time, the height of the mud loading barrel can be adjusted according to the dredging height, so that the mud in the cross-sectional area of ​​the mud loading barrel can be cleaned to the elevation every time the mud loading barrel enters the mud, further ensuring the mud grabbing efficiency.

[0049] In another technical solution, the dredging device suitable for a space-constrained environment is provided with a limit block 2 on the upper surface of any door panel, which is set so that when the two door panels are pulled up to the highest point, the angle between the two door panels is 10°-20°. That is, the size of the limit block 2 is set so that when the two door panels are lifted to the highest point by the force of the wire rope, the angle between any door panel and the horizontal plane must satisfy: 80°≤α≤85°. When α is too large, the door panel is subject to the force of the silt in the mud barrel, and there is a risk that it cannot fall normally; when α is too small, the opening area at the lower opening of the mud barrel is small, and the silt at the bottom of the water is not easy to enter, affecting the construction efficiency.

[0050] In another technical solution, the desilting device suitable for a space-constrained environment further includes a limiting column 6, which is fixed to the upper part of the mud barrel 1 through a bracket, and the middle part of the limiting column 6 has a through hole that runs through from top to bottom; the steel wire rope 1 is provided with a limiting block 2 5, which is located below the limiting column 6 and is fixedly connected to the steel wire rope 1 4; wherein the other end of the steel wire rope 1 passes through the guide wheel 2, the guide wheel 1 and the through hole in sequence and is connected to the flap door 3. wherein the limiting column 6 is fixed to the mud barrel 1, and when the steel wire rope 1 is lifted alone by the crawler crane to lift the door panel, the limiting block 2 5 on the steel wire rope 1 4 moves upward in the mud barrel for a certain distance and is blocked by the limiting column 6, and the limiting column 6 is the upper limit of the relative movement of the steel wire rope 1 4 in the mud barrel 1, and plays a role in preventing the steel wire rope 1 4 from being over-lifted, thereby reducing the risk of damage to the steel wire rope 1 and the flap door.

[0051] In another technical solution, in the desilting device suitable for a space-constrained environment, the centers of the rotating shaft, the stop block 2 5, the through hole, the weight block 13 and the vibration device are located on the center line of the mud barrel 1. Thus, on the one hand, the steel wire rope 1 4 is vertically arranged between the stop block 2 and the through hole to achieve synchronous lifting of the two door panels; on the other hand, the center of gravity of the entire device is made to coincide with the center of the mud barrel, ensuring that the entire device is stable and vertically cut into the mud during the mud entry process, reducing the time required for the mud entry process and making the construction process more stable.

[0052] In another technical solution, in the desilting device suitable for a space-constrained environment, the cross-sectional area of ​​the ballast block 13 is less than 60% of the cross-sectional area of ​​the mud barrel 1. Sufficient space is left between the bottom surface of the ballast block 13 and the upper surface of the mud barrel 1 to smoothly discharge the air, water and mud overflowed during construction in the mud barrel 1.

[0053] In another technical solution, the dredging device suitable for a space-constrained environment, the vibration device includes: a watertight box 14 fixed on the upper surface of the ballast block 13; and a vibrator 15 fixed inside the watertight box 14.

[0054] In the above technical solution, the function of the vibrator is to provide exciting force, increase the depth of the mud barrel into the mud, and improve the mud grabbing efficiency; the specific model of the vibrator needs to be selected according to the dredging depth. The greater the dredging depth, the stronger the exciting force of the vibrator to be selected. In this embodiment, the vibrator 15 is preferably a three-phase asynchronous vibrator, which is small in size and provides a large vibration force. The sealing performance of the outer shell of the watertight box 14 should meet the condition of no leakage at a depth of 15m underwater.

[0055] The vibration device also includes: a wire tube 11, which is installed on the side wall of the waterproof box 14, and the cable 10 of the vibrator 15 passes through the wire tube 11 and is connected to an external power supply; a cable fixing frame 12, which is respectively installed at both ends of the wire tube 11 and fixedly connected to the cable 10 near it. The wire tube 11 passes through the side wall of the waterproof box 14 and is connected to the outside. After the cable 10 passes through the wire tube, the cables on both sides of the wire tube 11 are fixed by the cable fixing frame 12 to ensure that the movement of the overall device will not affect the stable connection of the cable in the waterproof box, and the wire tube is filled with sealant to prevent water from entering the waterproof box.

[0056] In another technical solution, the dredging device suitable for a space-constrained environment further includes at least three fixed plates 16, which are evenly arranged on the outer wall of the bottom of the mud filling tube 1 along the outer circumference of the mud filling tube, and any fixed plate 16 includes a cross beam 17, which is horizontally arranged and one end of which is fixed to the outer wall of the mud filling tube 1; a vertical plate 18, which is vertically arranged and fixedly connected to the other end of the cross beam 17, and the bottom end of the vertical plate 18 is located in the same horizontal plane as the bottom end of the mud filling tube 1.

[0057] By setting a fixed plate at the bottom of the mud barrel, the mud barrel is prevented from being deflected by the external environment and gravity imbalance during the process of cutting into the mud, which causes the mud to be unable to enter the mud barrel smoothly. The above technical solution enables the mud barrel to move vertically downward stably, ensuring that enough mud can be loaded into the mud barrel, improving the mud grabbing efficiency and mud loading effect.

[0058] In another technical solution, the construction method of the dredging device suitable for a space-constrained environment comprises the following steps:

[0059] Step 1: connect the big hook of the crawler crane 8 to the lifting lug 9 through the wire rope 2 so that the dredging device suitable for a space-constrained environment is suspended on the water surface, and use the small hook of the crawler crane 8 to pull the wire rope 1 4 so that the two door panels are in a horizontal position, select a standard point on the wire rope 2 and mark it, and make a mark 1 on the wire rope 1 4, and the mark 1 and the standard point are located in the same horizontal plane;

[0060] Step 2: Use the small hook to vertically lift the steel wire rope 1 4. When the two door panels are pulled up to the highest point, make a mark 2 on the steel wire rope 1 4. The mark 2 and the standard point are located at the same horizontal plane.

[0061] Step 3, horizontally rotating the crawler crane 8, moving the dredging device suitable for a space-constrained environment to just above the location to be dredged, and simultaneously lowering the large hook and the small hook;

[0062] Step 4: When the steel wire rope 2 becomes loose, the lowering of the large hook and the small hook is stopped, and the depth of the mud-filling barrel into the mud is calculated according to the relative displacement between the standard point and the water surface;

[0063] Step 5: If the dredging depth is greater than or equal to the specified dredging depth or mud barrel length, lower the small hook until the mark 1 is on the same horizontal plane as the standard point, and then simultaneously lift the large hook and the small hook;

[0064] If the mud entry depth is less than the specified dredging depth and mud loading tube length, the vibration device is started, and after the second steel wire rope is tightened, the large hook and the small hook are lowered synchronously until the mud entry depth reaches the requirement, the large hook is stopped, and the small hook is lowered until the mark 1 and the standard point are on the same horizontal plane, and then the large hook and the small hook are raised synchronously;

[0065] Step 6: Use the crawler crane 8 to lift the dredging device suitable for a space-constrained environment above the water surface, and move it to a designated mud unloading point, lower the steel wire rope 1 4 separately, and pour out the mud in the mud loading barrel 1;

[0066] Step 7. After confirming that the sludge in the sludge barrel has been cleaned, lift the wire rope 1 4 so that the mark 2 and the standard point are located at the same horizontal plane, and then repeat the contents of steps 3 to 6 until the sludge in the construction area is cleaned to the specified dredging depth.

[0067] In the above technical solution, the wire rope is marked by spraying paint before construction, and the standard point, mark one and mark two are painted respectively. During the construction process, it is visually confirmed whether the position of the standard point is in the same horizontal plane as mark one or mark two. This method can quickly and intuitively determine the relative working state of the flap door in the water, and is easy to implement in actual operation. During the synchronous lowering and synchronous lifting of the large hook and the small hook, no relative displacement occurs between the wire rope one and the wire rope two. In the calculation of the mud penetration depth of the mud loading barrel, the relative displacement of the standard point and the water surface can be measured in real time when the mud loading barrel is in the mud and on the water surface, and the height from the underwater mud to the water surface is measured. The difference between the relative displacement and the height is the mud penetration depth of the mud loading barrel.

[0068] In another technical solution, in the construction method of the dredging device suitable for a space-constrained environment, the standard point is located above the water surface during the entire construction process. The standard point on the second wire rope should be selected as close as possible to the upper hook to avoid the marks on the first and second wire ropes sinking into the water when the depth of the mud is large, and the operator cannot judge the position of the mark on the shore.

[0069] In another technical solution, in the construction method of the dredging device suitable for a space-constrained environment, the specified dredging depth is equal to the dredging depth plus the height of the door panel in the vertical position. Since the large hook and the small hook are lowered synchronously during the mud-filling barrel entering the mud, the two door panels are always in a state of being lifted to the highest point. Therefore, after the bottom end of the mud-filling barrel reaches the dredging depth, it is necessary to continue to move downward for a distance to ensure that after the two door panels are lowered to the horizontal position, a sufficient amount of silt has been caught in the mud-filling barrel, so that the dredging depth of the construction position meets the standard. The height of the door panel in the vertical position is the distance between the free end of the door panel and the bottom end of the mud-filling barrel when the two door panels are lifted to the highest point.

[0070] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A dredging device suitable for a space-constrained environment, characterized in that: include: A mud-filling barrel, which is a hollow structure with upper and lower openings; A flap door is arranged at the lower opening of the mud loading barrel, the flap door comprises two door panels which are symmetrically arranged, the adjacent two sides of the two door panels are hinged with a rotating shaft, the two ends of the rotating shaft are fixedly connected with the inner side wall of the mud loading barrel, the two door panels are arranged to close the lower opening when they are in a horizontal position, and a limit block 1 is arranged on the upper surface of any door panel, which is arranged so that when the two door panels are pulled up to the highest point, the angle between the two door panels is 10°-20°; Two guide wheels, which are guide wheel 1 fixed to the upper part of the mud loading barrel through a bracket and guide wheel 2 fixed to the side wall of the mud loading barrel; A steel wire rope 1, one end of which is fixed on the crawler crane, and the other end of which passes through the guide wheel 2 and the guide wheel 1 in sequence, and is divided into two bundles and respectively fixed to the free ends of the two door panels; A ballast block, which is fixed to the top of the mud-loading barrel by means of a steel support, and a lifting lug is provided on the top surface and / or side wall of the ballast block; A vibration device is arranged on the top of the ballast block, and the vibration device comprises: a water-proof box, which is fixedly arranged on the upper surface of the ballast block; A vibrator is fixed inside the watertight box.

2. The dredging device suitable for a space-constrained environment according to claim 1, characterized in that: It also includes a limit column, which is fixed to the upper part of the mud loading barrel through a bracket, and the middle part of the limit column has a through hole that passes through it from top to bottom; a limit block 2 is provided on the steel wire rope 1, which is located below the limit column and fixedly connected to the steel wire rope 1; wherein the other end of the steel wire rope 1 passes through the guide wheel 2, the guide wheel 1 and the through hole in sequence and is connected to the flap door.

3. The dredging device suitable for a space-constrained environment according to claim 2, characterized in that: The centers of the rotating shaft, the second limiting block, the through hole, the weight block and the vibration device are located on the center line of the mud loading barrel.

4. The dredging device suitable for a space-constrained environment according to claim 1, characterized in that: The cross-sectional area of ​​the ballast block is less than 60% of the cross-sectional area of ​​the mud filling barrel.

5. The dredging device suitable for a space-constrained environment according to claim 1, characterized in that: It also includes at least three fixed plates, which are evenly arranged on the outer wall of the bottom of the mud filling barrel along the outer circumference of the mud filling barrel, and any fixed plate includes a crossbeam, which is horizontally arranged and one end of which is fixed to the outer wall of the mud filling barrel; and a vertical plate, which is vertically arranged and fixedly connected to the other end of the crossbeam, and the bottom end of the vertical plate and the bottom end of the mud filling barrel are located in the same horizontal plane.

6. A construction method for a dredging device suitable for a space-constrained environment according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: connect the large hook of the crawler crane to the lifting lug through the steel wire rope 2 so that the dredging device suitable for a space-constrained environment is suspended on the water surface, pull the steel wire rope 1 with the small hook of the crawler crane so that the two door panels are in a horizontal position, select a standard point on the steel wire rope 2 and mark it, and make a mark 1 on the steel wire rope 1, and the mark 1 and the standard point are located in the same horizontal plane; Step 2: Use the small hook to vertically lift the steel wire rope 1. When the two door panels are pulled up to the highest point, make a mark 2 on the steel wire rope 1. The mark 2 and the standard point are located at the same horizontal plane. Step 3, horizontally rotating the crawler crane, moving the dredging device suitable for a space-constrained environment to just above the location to be dredged, and simultaneously lowering the large hook and the small hook; Step 4: When the steel wire rope 2 becomes loose, the lowering of the large hook and the small hook is stopped, and the depth of the mud-filling barrel into the mud is calculated according to the relative displacement between the standard point and the water surface; Step 5: If the dredging depth is greater than or equal to the specified dredging depth or mud barrel length, lower the small hook until the mark 1 is on the same horizontal plane as the standard point, and then simultaneously lift the large hook and the small hook; If the mud entry depth is less than the specified dredging depth and mud loading tube length, the vibration device is started, and after the second steel wire rope is tightened, the large hook and the small hook are lowered synchronously until the mud entry depth reaches the requirement, the large hook is stopped, and the small hook is lowered until the mark 1 and the standard point are on the same horizontal plane, and then the large hook and the small hook are raised synchronously; Step 6: Use the crawler crane to lift the dredging device suitable for a space-constrained environment above the water surface, move it to a designated mud unloading point, lower the steel wire rope 1 separately, and pour out the mud in the mud barrel; Step 7. After confirming that the sludge in the sludge barrel has been cleaned, lift the wire rope 1 so that the mark 2 and the standard point are located at the same horizontal plane, and then repeat the contents of steps 3 to 6 until the sludge in the construction area is cleaned to the specified dredging depth.

7. The construction method of the dredging device suitable for a space-constrained environment according to claim 6, characterized in that: The standard point is located above the water surface during the entire construction process.

8. The construction method of the dredging device suitable for a space-constrained environment according to claim 6, characterized in that: The prescribed dredging depth is equal to the desilting depth plus the height of the door panel in the vertical position.

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