A crawler excavator used for piling in water transport engineering

Abstract

The present invention belongs to the technical field of excavators, and in particular to a crawler excavator used for piling in water transport engineering, including a control mechanism, the bottom of the control mechanism is rotatably connected to a mounting frame, track wheels are installed on both sides of the mounting frame, and a buoyancy box is arranged in the inner space of the track wheel, and the two sides of the buoyancy boxes separated from each other are both concave inward to form a groove. In the process of excavator construction, as the excavator extension arm drives the pile driver to gradually extend forward, the position of the counterweight block can be adjusted by the first hydraulic push rod, so that the weight of the excavator extension arm and the pile driver is partially balanced by the weight of the counterweight block. In addition, as the counterweight block moves, the spare box can also generate buoyancy of different sizes, and then cooperate with the counterweight block to balance the weight of the excavator extension arm and the pile driver to accelerate the excavator to maintain the balance of the center of gravity, thereby ensuring the stability of the excavator when operating on the water surface.

Description

Technical Field

[0001] The invention belongs to the technical field of excavators, and in particular relates to a crawler excavator used for piling in water transport engineering. Background Art

[0002] When dredging rivers in some coastal areas, due to the long-term disrepair of some embankments, in order to protect the safety of buildings in coastal areas, steel sheet piles need to be driven in front of the old embankments or houses on both sides of the river for support during construction. The average length of the steel sheet piles is 15m, the longest is 24m, and the top of the pile is flush with the original mud surface. However, during construction, some rivers are narrow and the coastline is tortuous, which does not have the conditions for large ships to enter and exit. In addition, the water depth is affected by the riverbed height difference and semi-diurnal tide. The riverbed is low in the middle and high on both sides. The tidal range is 1.8m and the water depth is about 0-3m. There are densely packed houses on both sides, and there are no land passages and construction conditions. The river takes into account the drainage and flood control of the villages on both sides. It is not allowed to fill earth and stone into the river, so only small watercraft can be used for construction.

[0003] At present, the main ways to meet the above special operations are:

[0004] (1) Barge crane + vibratory hammer:

[0005] Advantages: strong lifting capacity, can lift larger vibratory hammers, large lifting height, can adapt to driving extra-long piles;

[0006] Disadvantages: The crane and the vibrating hammer are softly connected by a steel wire rope, which cannot automatically clamp the pile. The auxiliary pile feeding efficiency is low and the construction period is long. The construction is affected by the water level and the piling is discontinuous. It also occupies a large area and has poor shifting controllability.

[0007] Water level requirements: The sluice gates need to be frequently opened and closed to regulate the water level. The water depth should be greater than 1m when moving the ship, and the water depth should be less than 0m when driving piles so that the pile top is exposed;

[0008] (ii) Floating platform + excavator + vibratory hammer:

[0009] Advantages: The excavator and the vibratory hammer are articulated, hydraulically controlled, automatically clamped, and highly efficient;

[0010] Disadvantages: The floating platform is affected by the water level, and the operation is discontinuous. It occupies a large area and has poor shifting and controllability;

[0011] Water level requirements: The water level needs to be adjusted frequently. The water depth should be greater than 1m when moving the ship, and the water depth should be such that the top of the pile is exposed when driving piles;

[0012] (III) Amphibious excavator + vibratory hammer:

[0013] Advantages: high efficiency, construction is not affected by water level, long operation time. Strong walking maneuverability, low safety risk of colliding with houses;

[0014] Disadvantages: The walking mechanism of conventional crawler excavators needs to be modified;

[0015] Water level demand: close the sluice gate when the water level is low to maintain the low water level.

[0016] After comparison, amphibious excavators are most suitable for the above-mentioned special working conditions. However, conventional amphibious excavators are relatively small and cannot meet the needs of driving extra-long steel sheet piles. Moreover, when the excavator is working on water, as the digging arm drives the pile driver to extend forward, the center of gravity of the excavator will also tilt forward, causing the excavator to be unstable when working on the water.

[0017] Therefore, it is necessary to invent a crawler excavator for piling in water transport engineering to solve the above problems. Summary of the invention

[0018] In view of the above problems, the present invention provides a crawler excavator for piling in water transport engineering to solve the problems raised in the above background technology.

[0019] To achieve the above object, the present invention provides the following technical solutions:

[0020] A crawler excavator for piling in water transport engineering, comprising a control mechanism, the bottom of the control mechanism is rotatably connected to a mounting frame, track wheels are installed on both sides of the mounting frame, a buoyancy box is arranged in the inner space of the track wheel, the two sides of the buoyancy boxes separated from each other are both recessed inward to form a groove, a buoyancy assembly is arranged in the groove, a mounting plate is horizontally installed at the bottom of the mounting frame, and the length direction of the mounting plate is parallel to the side direction of the mounting frame, a counterweight block is slidably installed at the bottom of the mounting plate, a spare box is arranged on the front side of the counterweight block, and the spare box is fixedly connected to The bottom of the mounting plate and the rear side of the spare box are designed to be open, a piston plate is arranged in the spare box, a plurality of pull rods are fixedly connected between the front side of the piston plate and the rear side of the counterweight block, the top of the counterweight block near both sides are fixedly connected with fixed blocks, both sides of the mounting plate are horizontally fixedly connected with connecting blocks, a first hydraulic push rod is vertically fixedly connected between the connecting block and the fixed block on the corresponding side, an air intake pipe is vertically connected to the top of the spare box near the front side, and the top of the air intake pipe is higher than the top of the track wheel, and a piling assembly is installed on the front side of the control mechanism.

[0021] Furthermore, the buoyancy assembly includes two floating plates, and the same connecting rod is arranged on the top of the two floating plates, and the two ends of the connecting rod are rotatably connected to the front and rear inner walls of the groove respectively, and a movable rod is fixedly connected to the middle position of the bottom of the connecting rod, and a second hydraulic push rod is hinged between the bottom end of the movable rod and the bottom inner wall of the groove, and the top end of the second hydraulic push rod is inclined away from the buoyancy box, and a notch is opened in the middle position of the side of the floating plate, and a fixing rod is arranged in the notch, and the front and rear sides of the fixing rod near the bottom end are rotatably connected to the front and rear inner walls of the notch respectively.

[0022] Furthermore, the piling assembly comprises an extended arm of an excavator, and the maximum lifting height of the extended arm of the excavator is 25m, and a pile driver is installed at the top end of the extended arm of the excavator.

[0023] Furthermore, the rear side of the piston plate is designed in a step-shaped design, and an annular sealing protrusion is fixedly connected to the inner walls around the rear end of the spare box. The thickness of the sealing protrusion gradually becomes thinner towards the piston plate, and the inclined surface of the sealing protrusion is parallel to the inclined surface of the step on the rear side of the piston plate.

[0024] Furthermore, the bottom surface of the counterweight block gradually protrudes downward from the front and rear sides, and the length of the counterweight block matches the opening width on the rear side of the spare box. The bottom of the counterweight block is flush with the bottom surface of the spare box. In the initial state, the counterweight block is located in the middle position of the bottom of the mounting frame, and the front side of the counterweight block is in contact with the rear side of the spare box.

[0025] Furthermore, an iron installation box is fixedly connected to the side of the floating plate away from the buoyancy box, and the bottom end of the installation box is inclined downward, a latch is slidably inserted into the bottom of the installation box, and a U-shaped card is slidably sleeved on the bottom end of the latch, and the U-shaped card is fixedly connected to the side of the buoyancy box, and a shift block is fixedly connected to the side of the latch away from the floating plate. A strip-shaped limiting hole is provided on the side of the installation box away from the floating plate, and the limiting hole and the shift block are located on the same motion trajectory, and the side of the limiting hole opposite to the shift block is open, and the top end of the latch is fixedly connected to a magnetic block, and the magnetic block can contact the top inner wall of the installation box, and the suction force between the magnetic block and the installation box is greater than the self-weight of the latch.

[0026] Furthermore, a telescopic plate is hingedly connected to the rear side of the piston plate near the bottom edge, and the length of the telescopic plate matches the length of the piston plate. The bottom end of the telescopic plate is inclined away from the piston plate. A plurality of compression springs are fixedly connected between the front side of the telescopic plate near the bottom edge and the rear side of the piston, and the rear end of the compression spring is inclined downward.

[0027] Furthermore, the sides of the track wheels and the pontoons are both wide at the top and narrow at the bottom, and the sum of the buoyancy of the two pontoons is greater than the overall gravity of the excavator in the present invention.

[0028] Technical effects and advantages of the present invention:

[0029] 1. The present invention is provided with a counterweight block and a spare box. During the construction process of the excavator, as the excavator's extended arm drives the pile driver to gradually extend forward, the position of the counterweight block can be adjusted by the first hydraulic push rod, so that the weight of the counterweight block itself is used to balance part of the weight of the excavator's extended arm and the pile driver. In addition, as the counterweight block moves, the spare box can also generate buoyancy of different sizes, thereby cooperating with the counterweight block to balance the weight of the excavator's extended arm and the pile driver to accelerate the excavator to maintain the balance of the center of gravity, thereby ensuring the stability of the excavator when operating on the water surface;

[0030] 2. The present invention is provided with a buoyancy assembly. When the excavator reaches the designated position, the second hydraulic push rods on both sides of the excavator can be activated to drive the floating plates to deflect upward. When the two floating plates are completely floating on the water surface driven by the fixed rod, the floating plates can generate buoyancy on the excavator from both sides of the excavator. At the same time, the floating plates also increase the supporting area of ​​the water surface for the excavator, thereby improving the stability of the excavator on the water surface;

[0031] 3. The present invention is provided with a sealing protrusion. When the piston plate moves backward to discharge the water in the standby tank from the rear side of the standby tank, when the rear side of the piston plate contacts the sealing protrusion, the surrounding of the trapezoidal platform on the rear side of the piston plate can increase the contact area with the standby tank through contact with the sealing protrusion, thereby improving the sealing effect of the piston plate on the rear opening of the standby tank, thereby ensuring that river water will not enter the space on the side of the piston plate away from the pull rod, and ensuring that the emptied standby tank can provide sufficient buoyancy for the excavator;

[0032] 4. The present invention is provided with a telescopic plate. During the movement of the piston plate, the bottom edge of the telescopic plate can scrape along the bottom inner wall of the standby box under the elastic force of the compression spring, thereby scraping the mud and sand deposited on the bottom inner wall of the standby box toward the opening of the standby box, so that the mud and sand can be moved out of the standby box, avoiding friction between the bottom of the piston plate and the deposited mud and sand during the movement of the piston plate, thereby ensuring that the bottom edge of the piston plate will not be worn by the mud and sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 It is a bottom perspective schematic diagram of the structure except the piling assembly in the present invention;

[0035] Figure 3 It is a three-dimensional schematic diagram of the track wheel, part of the buoyancy assembly, the buoyancy box and the U-shaped card in the present invention;

[0036] Figure 4It is a three-dimensional schematic diagram of structures such as a counterweight block, a spare box, a mounting plate, an air intake pipe, and a first hydraulic push rod in the present invention;

[0037] Figure 5 is a three-dimensional schematic diagram of a pile driving assembly in the present invention;

[0038] Figure 6 It is a three-dimensional schematic diagram of the buoyancy assembly, installation, latch, shift block and magnetic block in the present invention;

[0039] Figure 7 is a three-dimensional cross-sectional view of the spare box in the present invention;

[0040] Figure 8 It is a three-dimensional schematic diagram of the telescopic plate and the compression spring in the present invention.

[0041] In the figure: 1. control mechanism; 2. mounting frame; 3. track wheel; 4. buoyancy box; 5. buoyancy assembly; 51. floating plate; 52. connecting rod; 53. movable rod; 54. second hydraulic push rod; 55. fixed rod; 6. mounting plate; 7. counterweight block; 8. spare box; 9. piston plate; 10. pull rod; 11. fixed block; 12. connecting block; 13. first hydraulic push rod; 14. air intake pipe; 15. piling assembly; 151. excavator extension arm; 152. pile driver; 16. sealing protrusion; 17. mounting box; 18. latch; 19. U-shaped card; 20. dial block; 21. magnetic block; 22. telescopic plate; 23. compression spring. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0043] The present invention provides Figures 1 to 8A crawler excavator for piling in water transport engineering shown in the figure comprises a control mechanism 1, the bottom of the control mechanism 1 is rotatably connected to a mounting frame 2, track wheels 3 are installed on both sides of the mounting frame 2, a buoyancy box 4 is arranged in the inner space of the track wheel 3, and the two sides of the two buoyancy boxes 4 separated from each other are both recessed inward to form a groove, a buoyancy assembly 5 is arranged in the groove, a mounting plate 6 is horizontally installed at the bottom of the mounting frame 2, and the length direction of the mounting plate 6 is parallel to the side direction of the mounting frame 2, a counterweight block 7 is slidably installed at the bottom of the mounting plate 6, a spare box 8 is arranged on the front side of the counterweight block 7, the spare box 8 is fixedly connected to the bottom of the mounting plate 6, and the rear side of the spare box 8 is designed to be open, a piston plate 9 is arranged in the spare box 8, and the front side of the piston plate 9 is fixedly connected to the rear side of the counterweight block 7 There are multiple pull rods 10, the top of the counterweight block 7 is fixedly connected with a fixed block 11 near both sides, the two sides of the mounting plate 6 are horizontally fixedly connected with a connecting block 12, and a first hydraulic push rod 13 is vertically fixedly connected between the connecting block 12 and the fixed block 11 on the corresponding side, and the top of the spare box 8 is vertically connected with an air intake pipe 14 near the front side, and the top of the air intake pipe 14 is higher than the top of the track wheel 3, and a piling assembly 15 is installed on the front side of the control mechanism 1, and the piling assembly 15 includes an excavator extension arm 151, and the maximum lifting height of the excavator extension arm 151 is 25m, and a pile driver 152 is installed on the top of the excavator extension arm 151, and the sides of the track wheel 3 and the pontoon 4 are wide at the top and narrow at the bottom, and the sum of the buoyancy of the two pontoons 4 is greater than the overall gravity of the excavator in the present invention;

[0044] When performing pile driving operations, the excavator can move into the water through the track wheels 3 and move to the working area under the buoyancy generated by the pontoon 4. When the excavator moves to the working area, the buoyancy assembly 5 on the side of the pontoon 4 can be horizontally unfolded and float on the water surface, thereby increasing the supporting area of ​​the water surface for the excavator and providing auxiliary support to the excavator from both sides, thereby improving the stability of the excavator when operating on the water surface;

[0045] In addition, since the excavator extension arm 151 is longer, as the excavator extension arm 151 drives the pile driver 152 to gradually extend forward, the center of gravity of the excavator as a whole will gradually tilt forward, causing the excavator as a whole to tilt forward. At this time, the first hydraulic push rod 13 can be started to drive the counterweight block 7 to move backward by pushing the fixed block 11. As the counterweight block 7 moves backward, the weight of the counterweight block 7 can gradually balance part of the weight of the excavator extension arm 151 and the pile driver 152, so that the center of gravity of the excavator tilted forward can gradually move backward. At the same time, as the counterweight block 7 moves backward, the piston plate 9 can also move backward driven by the pull rod 10, thereby moving the load into the spare box 8. The river water is discharged from the rear side of the standby box 8, and as the river water in the standby box 8 is gradually discharged, the outside air can enter the side of the piston plate 9 away from the pull rod 10 through the air intake pipe 14, so that the standby box 8 can gradually generate buoyancy, and as the buoyancy of the standby box 8 gradually increases, the buoyancy generated by the standby box 8 can generate an upward support force on the front half of the excavator, and then cooperate with the counterweight block 7 to balance the gravity of the excavator's extended arm 151 and the pile driver 152 to accelerate the excavator to maintain the balance of the center of gravity, thereby ensuring the stability of the excavator when operating on the water surface, and during the entire construction process, the position of the counterweight block 7 can be adjusted by the first hydraulic push rod 13, so as to meet the operating requirements of the excavator's extended arm 151 in different extension states;

[0046] When the excavator is working on the water surface, the longer excavator extension arm 151 can also meet the need of driving extra-long steel sheet piles, thereby successfully completing the work of driving steel sheet piles for support in front of old embankments or houses on both sides of the river.

[0047] like Figure 3 and Figure 6 As shown, the buoyancy assembly 5 includes two floating plates 51, and the top of the two floating plates 51 is provided with a same connecting rod 52, and the two ends of the connecting rod 52 are respectively rotatably connected to the front and rear inner walls of the groove, and the middle position of the bottom of the connecting rod 52 is fixedly connected with a movable rod 53, and a second hydraulic push rod 54 is hinged between the bottom end of the movable rod 53 and the bottom inner wall of the groove, and the top end of the second hydraulic push rod 54 is inclined in the direction away from the buoyancy box 4, and a notch is opened in the middle position of the side of the floating plate 51, and a fixing rod 55 is arranged in the notch, and the front and rear sides of the fixing rod 55 near the bottom end are respectively rotatably connected to the front and rear inner walls of the notch;

[0048] When the excavator enters the river channel to work, after the excavator reaches the specified position, the second hydraulic push rods 54 on both sides of the excavator can be started to gradually extend them. As the second hydraulic push rods 54 gradually extend, the second hydraulic push rods 54 can push the bottom end of the movable rod 53 to deflect upward. As the movable rod 53 deflects upward, the connecting rod 52 can drive the two floating plates 51 to deflect upward through the two fixed rods 55 under the drive of the movable rod 53. When the two floating plates 51 are completely floating on the water surface under the drive of the fixed rods 55, the floating plates 51 can adaptively deflect with the connection point with the fixed rods 55 as the axis under the action of buoyancy, so as to float horizontally on the water surface. Then the second hydraulic push rods 54 stop extending. At this time, the floating plates 51 can generate buoyancy to the excavator from both sides of the excavator. At the same time, the floating plates 51 also increase the supporting area of ​​the water surface for the excavator, thereby improving the stability of the excavator on the water surface.

[0049] like Figure 7 As shown, the rear side of the piston plate 9 is designed in a stepped shape, and an annular sealing protrusion 16 is fixedly connected to the inner wall around the rear end of the standby box 8. The thickness of the sealing protrusion 16 gradually becomes thinner towards the direction close to the piston plate 9, and the inclined surface of the sealing protrusion 16 is parallel to the inclined surface of the stepped platform on the rear side of the piston plate 9;

[0050] By providing a sealing protrusion 16, when the piston plate 9 moves backward to discharge the water in the spare tank 8 from the rear side of the spare tank 8, when the rear side of the piston plate 9 contacts the sealing protrusion 16, the four sides of the trapezoidal platform on the rear side of the piston plate 9 can increase the contact area with the spare tank 8 through contact with the sealing protrusion 16, thereby improving the sealing effect of the piston plate 9 on the rear opening of the spare tank 8, thereby ensuring that river water will not enter the space on the side of the piston plate 9 away from the pull rod 10, and ensuring that the emptied spare tank 8 can provide sufficient buoyancy for the excavator.

[0051] like Figure 2 and Figure 4 As shown, the bottom surface of the counterweight block 7 gradually protrudes downward from the front and rear sides, and the length of the counterweight block 7 matches the opening width of the rear side of the spare box 8. The bottom of the counterweight block 7 is flush with the bottom surface of the spare box 8. In the initial state, the counterweight block 7 is located in the middle position of the bottom of the mounting frame 2, and the front side of the counterweight block 7 is in contact with the rear side of the spare box 8.

[0052] In the initial state, the counterweight block 7 can be located at the middle position of the bottom of the mounting frame 2, so that when the excavator is working in water, the counterweight block 7 and the center of the excavator can remain in the center state, thereby ensuring the overall stability of the excavator after entering the water;

[0053] When the excavator moves forward in the water, the counterweight 7 shielded at the rear side of the spare box 8 can prevent excessive debris in the water from entering the spare box 8.

[0054] like Figures 1 to 6 As shown, the side of the floating plate 51 away from the buoyancy box 4 is fixedly connected with an iron installation box 17, and the bottom end of the installation box 17 is tilted downward, and a latch 18 is slidably inserted at the bottom of the installation box 17, and a U-shaped card 19 is slidably sleeved at the bottom end of the latch 18, and the U-shaped card 19 is fixedly connected to the side of the buoyancy box 4, and the side of the latch 18 away from the floating plate 51 is fixedly connected with a shift block 20, and a strip-shaped limiting hole is provided on the side of the installation box 17 away from the floating plate 51, and the limiting hole and the shift block 20 are located on the same motion trajectory, and the side opposite to the limiting hole and the shift block 20 is designed as an opening, and the top of the latch 18 is fixedly connected with a magnetic block 21, and the magnetic block 21 can contact the top inner wall of the installation box 17, and the suction force between the magnetic block 21 and the installation box 17 is greater than the self-weight of the latch 18;

[0055] By providing the latch 18, when the excavator is not working in the water, the shift block 20 can be moved to drive the latch 18 to be inserted into the corresponding U-shaped card 19, so that the U-shaped card 19 can be used to limit the latch 18 to achieve the fixing operation of the floating plate 51, thereby avoiding the floating plate 51 from shaking and making noise due to vibration during the movement of the excavator. When the excavator is working, the shift block 20 can be moved to drive the latch 18 to move upward and move out of the corresponding U-shaped card 19, thereby releasing the restriction on the floating plate 51, and when the latch 18 moves upward into the installation box 17, the magnetic block 21 on the top of the latch 18 can be adsorbed together with the inner wall of the top of the installation box 17, thereby avoiding the latch 18 from being reinserted into the corresponding U-shaped card 19 under the action of its own gravity.

[0056] like Figure 7 and Figure 8 As shown, a telescopic plate 22 is hinged at a position near the bottom edge of the rear side of the piston plate 9, and the length of the telescopic plate 22 matches the length of the piston plate 9, and the bottom end of the telescopic plate 22 is inclined in a direction away from the piston plate 9, and a plurality of compression springs 23 are fixedly connected between a position near the bottom edge of the front side of the telescopic plate 22 and the rear side of the piston, and the rear end of the compression spring 23 is inclined downward;

[0057] By providing the telescopic plate 22, during the movement of the piston plate 9, the bottom edge of the telescopic plate 22 can scrape along the bottom inner wall of the standby box 8 under the elastic force of the compression spring 23, thereby scraping the mud and sand deposited on the bottom inner wall of the standby box 8 toward the opening of the standby box 8, so that the mud and sand can be moved out of the standby box 8, avoiding friction between the bottom of the piston plate 9 and the deposited mud and sand during the movement of the piston plate 9, thereby ensuring that the bottom edge of the piston plate 9 will not be worn by the mud and sand;

[0058] As the telescopic plate 22 scrapes backward along the bottom inner wall of the spare box 8, when the telescopic plate 22 contacts the sealing protrusion 16 at the rear opening of the spare box 8, the telescopic plate 22 can retract upward under the pushing of the inclined surface of the sealing protrusion 16. During this process, the compression spring 23 is gradually compressed. When the bottom of the telescopic plate 22 is flush with the front side of the spare box 8, the mud and sand deposited on the bottom inner wall of the spare box 8 can be removed from the spare box 8 under the scraping of the telescopic plate 22.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A crawler excavator for piling in water transport engineering, comprising a control mechanism (1), characterized in that: The bottom of the control mechanism (1) is rotatably connected to a mounting frame (2), track wheels (3) are installed on both sides of the mounting frame (2), a buoyancy box (4) is arranged in the inner space of the track wheel (3), and the two sides of the two buoyancy boxes (4) are recessed inward to form a groove, and a buoyancy component (5) is arranged in the groove. A mounting plate (6) is horizontally installed at the bottom of the mounting frame (2), and the length direction of the mounting plate (6) is parallel to the side direction of the mounting frame (2). A counterweight block (7) is slidably installed at the bottom of the mounting plate (6), and a spare box (8) is arranged on the front side of the counterweight block (7). The spare box (8) is fixedly connected to the bottom of the mounting plate (6), and the rear side of the spare box (8) is The invention has an open design, wherein a piston plate (9) is arranged in the spare box (8), a plurality of pull rods (10) are fixedly connected between the front side of the piston plate (9) and the rear side of the counterweight block (7), a fixing block (11) is fixedly connected to the top of the counterweight block (7) near both sides, a connecting block (12) is horizontally fixedly connected to both sides of the mounting plate (6), a first hydraulic push rod (13) is vertically fixedly connected between the connecting block (12) and the fixing block (11) on the corresponding side, an air intake pipe (14) is vertically connected to the top of the spare box (8) near the front side, and the top of the air intake pipe (14) is higher than the top of the track wheel (3), and a piling assembly (15) is installed on the front side of the control mechanism (1).

2. A crawler excavator for piling in water transport engineering according to claim 1, characterized in that: The buoyancy assembly (5) comprises two floating plates (51), the tops of the two floating plates (51) are provided with a common connecting rod (52), the two ends of the connecting rod (52) are respectively rotatably connected to the front and rear inner walls of the groove, a movable rod (53) is fixedly connected to the middle position of the bottom of the connecting rod (52), a second hydraulic push rod (54) is hinged between the bottom end of the movable rod (53) and the bottom inner wall of the groove, and the top end of the second hydraulic push rod (54) is inclined in a direction away from the buoyancy box (4), a notch is opened in the middle position of the side of the floating plate (51), a fixing rod (55) is arranged in the notch, and the front and rear sides of the fixing rod (55) near the bottom end are respectively rotatably connected to the front and rear inner walls of the notch.

3. A crawler excavator for piling in water transport engineering according to claim 1, characterized in that: The pile driving assembly (15) comprises an extended excavator arm (151), and the maximum lifting height of the extended excavator arm (151) is 25m. A pile driver (152) is installed at the top end of the extended excavator arm (151).

4. A crawler excavator for piling in water transport engineering according to claim 1, characterized in that: The rear side of the piston plate (9) is designed in a stepped shape, and an annular sealing protrusion (16) is fixedly connected to the inner wall around the rear end of the spare box (8). The thickness of the sealing protrusion (16) gradually becomes thinner towards the piston plate (9), and the inclined surface of the sealing protrusion (16) is parallel to the inclined surface of the step on the rear side of the piston plate (9).

5. A crawler excavator for piling in water transport engineering according to claim 4, characterized in that: The bottom surface of the counterweight block (7) gradually protrudes downward from the front and rear sides, and the length of the counterweight block (7) matches the opening width of the rear side of the spare box (8). The bottom of the counterweight block (7) is flush with the bottom surface of the spare box (8). In the initial state, the counterweight block (7) is located in the middle position of the bottom of the mounting frame (2), and the front side of the counterweight block (7) is in contact with the rear side of the spare box (8).

6. The crawler excavator for piling in water transport engineering according to claim 2, characterized in that: An iron installation box (17) is fixedly connected to the side of the floating plate (51) away from the floating box (4), and the bottom end of the installation box (17) is tilted downward. A latch (18) is slidably inserted at the bottom of the installation box (17), and a U-shaped card (19) is slidably sleeved at the bottom end of the latch (18). The U-shaped card (19) is fixedly connected to the side of the floating box (4), and a shift block (20) is fixedly connected to the side of the latch (18) away from the floating plate (51). A strip-shaped limiting hole is provided on one side of the mounting box (17) away from the floating plate (51); the limiting hole and the shifting block (20) are located on the same movement trajectory, and the side of the limiting hole opposite to the shifting block (20) is designed to be open; a magnetic block (21) is fixedly connected to the top of the latch (18); the magnetic block (21) can contact the top inner wall of the mounting box (17), and the suction force between the magnetic block (21) and the mounting box (17) is greater than the self-weight of the latch (18).

7. The crawler excavator for piling in water transport engineering according to claim 4, characterized in that: A telescopic plate (22) is hingedly connected to the rear side of the piston plate (9) near the bottom edge, and the length of the telescopic plate (22) matches the length of the piston plate (9). The bottom end of the telescopic plate (22) is inclined in a direction away from the piston plate (9). A plurality of compression springs (23) are fixedly connected between the front side of the telescopic plate (22) near the bottom edge and the rear side of the piston, and the rear end of the compression spring (23) is inclined downward.

8. The crawler excavator for piling in water transport engineering according to claim 6, characterized in that: The sides of the track wheel (3) and the pontoon (4) are both wide at the top and narrow at the bottom, and the sum of the buoyancy of the two pontoons (4) is greater than the overall gravity of the excavator of the present invention.

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