A dredging device for undrained caisson and a method of using the same

Abstract

The present invention relates to the technical field of caisson engineering construction, and specifically to a dredging device for a non-drainage caisson and a method of using the dredging device. A wheel group is provided at the bottom of a walking mechanism, and the device moves along the track through the wheel group. A lifting mechanism comprises a first telescopic device, one end of the lifting mechanism is connected to the walking mechanism, and the other end is connected to a swinging mechanism, and the swinging mechanism moves up and down through the first telescopic device. A swinging mechanism, one end of the swinging mechanism is connected to a mud suction mechanism and a mud digging mechanism, and the other end is connected to the lifting mechanism through a second telescopic device. The mud suction device and the mud digging device are controlled by the swinging mechanism to make reciprocating motion, and a track connected to the caisson structure is used to provide a smooth passage when the mud digging device is walking, and a reliable supporting surface is provided during the mud digging operation. Through the mutual linkage of the track walking mechanism, the lifting mechanism, and the swinging mechanism, the mud suction mechanism can excavate the soil range covered by all caissons, including the soil below the blade foot.

Description

Technical Field

[0001] The invention relates to the technical field of caisson engineering construction, in particular to a dredging device for a undrained caisson and a use method thereof. Background Art

[0002] Caisson, that is, after the well is made on the surface or the bottom of the foundation pit, the soil is excavated and drained in the well, relying on the well's own gravity to overcome the friction between the outer side of the well wall and the soil layer, so that the well can sink to the designated position in a controlled manner. Among them, excavation and drainage are an important task in the construction process of caisson. Due to the diversity of soil, ordinary excavation methods have a certain range of adaptability to different soils. If the stratum has sufficient strength, the soil below the blade foot cannot collapse under the action of the well's own weight, and the excavation equipment cannot effectively excavate the soil below the blade foot, then the caisson will be difficult to sink or even impossible to sink. In addition, in order to achieve stable vertical sinking of the caisson, it is necessary to excavate the stratum evenly. However, since the excavation is carried out under the water surface, it is difficult to observe whether the excavation of the stratum is synchronized and balanced during the operation. If the excavation position is determined based on the inclination measurement of the caisson, there is a lag, which brings risks to the construction, and it is also difficult to achieve precise control of the vertical sinking of the caisson. Summary of the invention

[0003] The purpose of the present invention is to provide a dredging device and its use method that is adaptable to a wide range of soil types, flexible in control, easy to install and disassemble, and suitable for excavating different caisson cross-sectional contours, under the background of existing undrained caisson excavation methods and construction equipment.

[0004] In order to achieve the above-mentioned purpose, a dredging device for a undrained caisson is characterized in that it includes a caisson with a track provided on the inner wall of the caisson; a walking mechanism with a wheel group provided at the bottom of the walking mechanism, which moves along the track through the wheel group; a lifting mechanism, including a first telescopic device, one end of the lifting mechanism is connected to the walking mechanism, and the other end is connected to the swinging mechanism, and the swinging mechanism is moved up and down through the first telescopic device; a swinging mechanism, one end of the swinging mechanism is connected to the mud suction mechanism and the dredging mechanism, and the other end is connected to the lifting mechanism through a second telescopic device; a mud suction device and a dredging device, which are controlled by the swinging mechanism to make reciprocating motion.

[0005] Preferably, the track is composed of a straight segment track and an arc segment track, which is fitted with the contour of the caisson, and the straight segment track and the arc segment track are smoothly connected.

[0006] Preferably, the walking mechanism includes two pairs of wheel groups, each pair of wheel groups includes grooved rollers, smooth rollers, anti-rollover wheels and a driving device, the grooved rollers and smooth rollers are arranged on the upper surface of the track, the driving device is connected to the grooved rollers, driving the grooved rollers and smooth rollers to move along the track, and the anti-rollover wheels are arranged on the lower surface of the track and move along the track.

[0007] Preferably, the grooved roller is provided with a groove which matches the shape of the track.

[0008] Preferably, the lifting mechanism includes a sliding arm, a sliding seat and a first telescopic device, one end of the first telescopic device is connected to the fuselage through a fixed block, and the fuselage is connected to the walking mechanism, the other end of the first telescopic device is connected to the sliding seat, the interior of the sliding seat is hollow, one end of the sliding arm is fixedly connected to the fixed block, and the other end is inserted into the inner cavity of the sliding seat, and the telescopic device is telescopic to drive the sliding seat to move up and down along the sliding arm.

[0009] Preferably, the swing mechanism includes a second telescopic device and a swing arm, one end of the second telescopic device is connected to the slide, and the other end is connected to the swing arm, one end of the swing arm is fixedly connected to the slide, and the other end is connected to a connecting rod, and the second telescopic device telescopes to drive the swing arm to swing around the fixed point of the swing arm and the slide.

[0010] Preferably, the connecting rod is fixedly connected to the swing arm, and a mud suction mechanism and a mud digging mechanism are provided at the bottom of the connecting rod.

[0011] A method for using a dredging device for an undrained caisson is designed. When in use, the walking position, lifting height, and swing amplitude of the dredging device are controlled and monitored. The steps are as follows:

[0012] A. According to the setting, the travel mechanism moves to a workstation;

[0013] B. The lifting mechanism works to move the dredging mechanism and the dredging mechanism to the set height;

[0014] C. Start the sludge suction mechanism and the sludge digging mechanism, and at the same time, the swing mechanism works to dig the soil within the range of the motion trajectory;

[0015] D. Based on the monitored vertical displacement of the caisson, determine whether the caisson is over-excavated or under-excavated, and analyze the over-excavated or under-excavated areas;

[0016] E. Control the walking mechanism to move to the under-excavated area, control the lifting mechanism to lift to a suitable height, and excavate the under-excavated area;

[0017] F. After the excavation is completed, the walking mechanism moves to the next work station according to the set step distance and works in a cycle.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. Through the track connected to the caisson structure, a smooth passage is provided for the dredging device to move, and a reliable supporting surface is provided during the dredging operation;

[0020] 2. Through the linkage of the track travel mechanism, lifting mechanism and swing mechanism, the mud suction mechanism can excavate the soil covered by all caissons, including the area below the blade foot;

[0021] 3. The traveling mechanism consists of two sets of wheels and a machine body. The machine body and wheels are connected by a slewing bearing and can travel on a track consisting of straight and curved segments.

[0022] 4. By monitoring the walking position, lifting height and swing amplitude of the dredging mechanism, the excavation process is controlled and the soil under the caisson is excavated evenly;

[0023] 5. Carry out excavation synchronously and evenly to ensure that the caisson is stable and the inclination is controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a reference diagram of the use state of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the walking mechanism of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the lifting mechanism and the swing mechanism of the present invention;

[0027] Among them: 1. Dredging mechanism 2. Dredging mechanism 3. Track 4. Wheel set 5. Slewing bearing 6. Fuselage 7. Power system 8. Caisson 9. Lifting mechanism 10. Swinging mechanism 11. Anti-overturning wheel 12. Smooth roller 13. Driving device 14. Grooved roller 15. Sliding arm 16. Sliding seat 17. Second telescopic device 18. Swing arm 19. First telescopic device. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings, and the structure and principle of the present invention are very clear to people in the field. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Example 1, see Figure 1 The present invention designs a dredging device for an undrained caisson, including a walking mechanism, a lifting mechanism, a swinging mechanism, a dredging mechanism and a dredging mechanism. Tracks are provided on the inner wall of the caisson, including straight segment tracks and arc segment tracks. The tracks are smoothly connected and fit the contour of the caisson. The dredging device moves along the tracks as a whole.

[0030] The walking mechanism comprises two pairs of wheel sets, a machine body and a slewing bearing, wherein the machine body and the wheel sets are connected via the slewing bearing. Figure 2The figure shows the wheel set of the dredging device's traveling mechanism. Each pair of wheel sets consists of a grooved roller, a smooth roller, and two anti-tipping wheels. The grooved roller is driven by the driving device as the active wheel, and is guided by the inner end face of the groove of the grooved roller and the contact between the upper rail surface of the track. The smooth roller is a passive wheel, which is also set on the upper rail surface of the track and moves together with the grooved roller. Anti-tipping wheels are set on both sides of the wheel set. The anti-tipping wheels are set on the lower rail surface of the track and move together with the grooved roller. The grooved roller, the smooth roller and the anti-tipping wheels on both sides make the wheel set as a whole only move along the upper surface and side of the track, but cannot flip.

[0031] like Figure 3 The figure shows the lifting mechanism, swing mechanism, mud suction mechanism and mud digging mechanism of the dredging device. The lifting mechanism includes a sliding arm, a sliding seat and a first telescopic device. A fixed block is provided on the top of the lifting mechanism. One end of the first telescopic device and one end of the sliding arm are connected to the fixed block. The other end of the first telescopic device is connected to the sliding seat. The interior of the sliding seat is hollowed out. The other end of the sliding arm is inserted into the sliding seat. The first telescopic device is generally a cylinder or an electric push rod. The telescopic movement of the cylinder or the electric push rod drives the sliding seat to move up and down along the sliding arm. The swing mechanism includes a swing arm and a second telescopic device. One end of the swing arm and one end of the second telescopic device are connected to the sliding seat. The second telescopic device is generally a cylinder or an electric push rod. The telescopic movement of the cylinder or the electric push rod drives the swing arm to swing around the fixed point of the sliding seat. The mud suction mechanism and the mud digging mechanism are installed on a connecting rod. The connecting rod is connected to the swing arm, so that the swing of the swing arm drives the mud suction mechanism and the mud digging mechanism to swing.

[0032] Embodiment 2, the present invention provides a method for using the dredging device for undrained caisson. The device has two modes when in use, a normal working mode and an over-excavation and under-excavation mode. The working conditions in the two modes are as follows:

[0033] Normal working mode:

[0034] 1. The dredging device moves according to the setting, and the walking mechanism moves at a certain step distance. After moving to a new working position, the walking mechanism stops;

[0035] 2. The lifting mechanism works to place the dredging mechanism and the dredging mechanism connected to the swing mechanism to the set height;

[0036] 3. Start the dredging mechanism and the dredging mechanism;

[0037] 4. The swing mechanism works to excavate the soil within the range of the motion trajectory;

[0038] 5. After the excavation work at the current position is completed, the walking mechanism moves to the next work station according to the set step distance to work in a cycle.

[0039] Over-digging and under-digging working modes:

[0040] 1. When the caisson deflects, determine whether the lower soil is over-excavated or under-excavated, and analyze the distribution areas of over-excavation and under-excavation. Monitor the position of the dredging device through the position sensor of the dredging device, and control the dredging device's walking mechanism to move to the under-excavation area;

[0041] 2. Start the dredging mechanism and the dredging mechanism, and start the swinging mechanism;

[0042] 3. Observe the excavation of the soil discharge pipe connected to the mud suction mechanism, and control the lifting mechanism to place the dredging mechanism and the mud suction mechanism at a reasonable height to achieve better excavation efficiency;

[0043] 4. After the deviation correction is completed, the caisson returns to a vertical state and the dredging device enters normal working mode.

Claims

1. A dredging device for undrained caissons, characterized in that include A caisson, wherein a track is provided on the inner wall of the caisson; A walking mechanism, comprising a body and a wheel set, wherein the bottom of the walking mechanism is provided with a wheel set, and the walking mechanism moves along the track through the wheel set; A lifting mechanism, comprising a first telescopic device, one end of the lifting mechanism is connected to the walking mechanism, and the other end is connected to the swing mechanism, and the swing mechanism moves up and down through the first telescopic device; A swing mechanism, one end of which is connected to the dredging mechanism and the suction mechanism, and the other end of which is connected to the lifting mechanism through a second telescopic device; A dredging device and a dredging device, which are controlled by a swing mechanism to make reciprocating motion; It also includes a slewing bearing, and the body and the walking mechanism are connected via the slewing bearing; The lifting mechanism includes a sliding arm, a sliding seat and a first telescopic device, one end of the first telescopic device is connected to the fuselage through a fixed block, the fuselage is connected to the walking mechanism, the other end of the first telescopic device is connected to the sliding seat, the interior of the sliding seat is hollow, one end of the sliding arm is fixedly connected to the fixed block, and the other end is inserted into the inner cavity of the sliding seat, and the telescopic device is extended and retracted to drive the sliding seat to move up and down along the sliding arm; The walking mechanism includes two pairs of wheel groups, each pair of wheel groups includes grooved rollers, smooth rollers, anti-overturning wheels and a driving device. The grooved rollers and smooth rollers are arranged on the upper surface of the track. The driving device is connected to the grooved rollers to drive the grooved rollers and the smooth rollers to move along the track. The anti-overturning wheels are arranged on the lower surface of the track and move along the track.

2. A dredging device for a undrained caisson as claimed in claim 1, characterized in that: The track is composed of a straight segment track and an arc segment track, which is fitted with the contour of the caisson, and the straight segment track and the arc segment track are smoothly connected.

3. A dredging device for a undrained caisson as claimed in claim 1, characterized in that: The grooved roller is provided with a groove which matches the shape of the track.

4. A dredging device for a undrained caisson as claimed in claim 1, characterized in that: The swing mechanism includes a second telescopic device and a swing arm, one end of the second telescopic device is connected to the slide, and the other end is connected to the swing arm, one end of the swing arm is fixedly connected to the slide, and the other end is connected to a connecting rod. The second telescopic device telescopes to drive the swing arm to swing around the fixed point of the swing arm and the slide.

5. A dredging device for a undrained caisson as claimed in claim 4, characterized in that: The connecting rod is connected and fixed to the swing arm, and a mud suction mechanism and a mud digging mechanism are arranged at the bottom of the connecting rod.

6. A method for using a dredging device for a undrained caisson as claimed in claim 1, characterized in that: When in use, the walking position, lifting height and swing amplitude of the dredging device are controlled and monitored.

7. A method for using a dredging device for a non-drained caisson as claimed in claim 6, characterized in that The method comprises the following steps: A. According to the setting, the travel mechanism moves to a workstation; B. The lifting mechanism works to move the dredging mechanism and the dredging mechanism to the set height; C. Start the sludge suction mechanism and the sludge digging mechanism, and at the same time, the swing mechanism works to dig the soil within the range of the motion trajectory; D. Based on the monitored vertical displacement of the caisson, determine whether the caisson is over-excavated or under-excavated, and analyze the over-excavated or under-excavated areas; E. Control the walking mechanism to move to the under-excavated area, control the lifting mechanism to lift to a suitable height, and excavate the under-excavated area; F. After the excavation is completed, the walking mechanism moves to the next work station according to the set step distance and works in a cycle.

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