A bucket foundation with a drag reduction system and a suction caisson installation method

Abstract

The application discloses a barrel foundation with a drag reduction system and a reaming and suction type sinking installation method, and relates to the field of barrel foundation sinking installation methods.The barrel foundation with a drag reduction system comprises a barrel foundation, a drag reduction system and a negative pressure sinking system with a reaming and suction device.The drag reduction system comprises a drag reduction barrel sleeve provided with a thixotropic mud channel and a thixotropic mud outlet, a thixotropic mud pipe and a thixotropic mud system; and the drag reduction is realized by pressing the thixotropic mud into the gap between the drag reduction barrel sleeve and the soil.The negative pressure sinking system with a reaming and suction device comprises a reaming and suction device, a negative pressure sinking barrel cover and a negative pressure system, and the reaming and suction device is provided with a reamer head, a cement slurry injection port and a high-pressure water injection port; and the reaming and suction device is used for realizing negative pressure sinking, soil and rock reaming and suction and soil reinforcement.The drag reduction system and the reaming and suction device can effectively reduce the sinking resistance of the barrel foundation, improve the sinking construction speed and be suitable for more construction terrains; the soil reinforcement operation improves the seepage stability of the barrel foundation, and effectively controls the deformation and uneven settlement in long-term construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bucket foundation, and particularly relates to a bucket foundation with a drag reduction system and a suction caisson sinking installation method. BACKGROUND

[0002] Offshore bucket foundation is involved in a large number of marine engineering projects, such as artificial island construction, harbor construction, island expansion, cross-sea bridge, coastline protection, offshore cofferdam engineering, etc., and the offshore bucket foundation plays an extremely important role in them.

[0003] In addition to the application in marine engineering, the bucket foundation is also widely used in practical engineering such as ventilation well / working well of land tunnel traffic engineering, working well of water diversion engineering, underground garage, emergency escape passage, storage space (for oil, grain and water storage) and the like. At present, common bucket foundation installation methods include percussion hammering and negative pressure sinking methods. The percussion hammering method achieves the smooth sinking of the bucket into the soil by destroying the soil structure through high-speed vibration of the hydraulic hammer to liquefy the soil around the bucket, so as to reduce the sinking resistance. Therefore, this method reduces the stability of the soil and increases the risk of seepage damage around the bucket foundation, overall instability of the bucket foundation and even fracture damage. The negative pressure sinking method is to use a negative pressure pump to form a pressure difference between the inside and outside of the bucket after sinking by self-weight, so as to realize the sinking installation of the bucket foundation. It belongs to the static pressure sinking method and has relatively small disturbance to the soil around the bucket. Compared with the percussion hammering method, the negative pressure sinking method has the characteristics of low cost, high efficiency and small environmental impact. However, when encountering coarse gravel or dense cohesive soil layer, the soil inside and outside the bucket is difficult to produce seepage effect, resulting in too large sinking resistance in the sinking process, and the bucket foundation cannot complete the sinking requirement.

[0004] Therefore, in order to solve the problems of sinking instability, damage and excessive sinking resistance of the bucket foundation, for the installation of the bucket foundation in complex sea areas or land areas with high underground water level, an improved bucket foundation structure and sinking method with high construction efficiency, economy and safety are urgently needed. SUMMARY

[0005] The present application aims at the deficiencies of the prior art and provides a bucket foundation with a drag reduction system and a suction caisson sinking installation method.

[0006] The purpose of the present application is achieved by the following technical solutions:

[0007] According to a first aspect of the present application, a bucket foundation with a drag reduction system is provided, comprising a bucket foundation, a drag reduction system, a negative pressure sinking system with a suction device.

[0008] The drag reduction system comprises a drag reduction barrel sleeve provided with a thixotropic mud passage and a thixotropic mud outlet, a thixotropic mud pipe and a thixotropic mud system; the drag reduction barrel sleeve is tightly connected to the outside of the barrel foundation; the thixotropic mud passage is arranged in the barrel wall of the drag reduction barrel sleeve, vertically penetrates the drag reduction sleeve, and is communicated with the outside through the thixotropic mud outlet; the thixotropic mud outlets are uniformly distributed on the lower part of the drag reduction barrel sleeve; one end of the thixotropic mud pipe is connected with the thixotropic mud system, and the other end is communicated with the thixotropic mud passage; the thixotropic mud system comprises a thixotropic mud box, a pressure pump and a control valve.

[0009] The negative pressure sinking system with the cutter suction device comprises a cutter suction device, a negative pressure sinking barrel cover and a negative pressure system.

[0010] The cutter suction device is composed of a reamer head, a rotary jet sleeve, a drill pipe and a mud discharge pipe; the reamer head comprises a cutter head provided with reamer blades, which are used for cutting and crushing stones in the soil; the cutter head is installed at the lower end of the rotary jet sleeve; the rotary jet sleeve is provided with a cement slurry jet port and a high-pressure water jet port; a suction port is arranged on the bottom end surface of the drill pipe, penetrates the drill pipe, the rotary jet sleeve and the cutter head, and is communicated with the mud discharge pipe; the rotary jet sleeve is installed at the lower end of the drill pipe, and the drill pipe is connected with the mud discharge pipe through the sealing port of the negative pressure sinking barrel cover.

[0011] The negative pressure sinking barrel cover comprises a top cover provided with a negative pressure hole and a sealing port and a fixed steel plate; the top cover is sealingly installed on the top of the barrel foundation; the negative pressure hole is connected with the negative pressure system; and the sealing port is used for sealingly connecting the drill pipe with the top cover and the fixed steel plate.

[0012] According to another aspect of the present specification, a cutter suction sinking installation method of a barrel foundation with a drag reduction system is provided, which comprises the following steps:

[0013] (S1) hoisting the barrel foundation with a drag reduction barrel sleeve to the installation area, and installing the negative pressure sinking barrel cover with the cutter suction device;

[0014] connecting the negative pressure hole with the negative pressure system, connecting the mud discharge pipe with the mud discharge system, and communicating the thixotropic mud system with the thixotropic mud passage through the thixotropic mud pipe;

[0015] lowering the drill pipe until the bottom surface of the reamer head is flush with the elevation of the bottom surface of the barrel foundation;

[0016] (S2) after the barrel foundation is uniformly sunk under the action of gravity and stops, opening the negative pressure hole and the suction port, and starting the negative pressure system, the reamer head in the cutter suction device and the mud discharge system to continue sinking the barrel foundation;

[0017] when the reading of the soil pressure sensor near the thixotropic mud outlet reaches a set value, starting the thixotropic mud system to assist the sinking of the barrel foundation;

[0018] (S3) After the barrel type foundation is sunk to the design elevation, the negative pressure hole, the suction port, and the negative pressure system are closed, the thixotropic mud is replaced by the thixotropic mud solidifying agent, the thixotropic mud in the gap between the drag reduction barrel sleeve and the soil body is solidified by the thixotropic mud system after being pressurized and then passing through the thixotropic mud pipe, the thixotropic mud channel, and the thixotropic mud outlet;

[0019] The reamer head and the mud discharge system continue to work, and the drill rod continues to drill from top to bottom;

[0020] (S4) When the drill rod drills to the specified height, the reamer head and the mud discharge system are stopped;

[0021] The rotary jet sleeve and the high-pressure water jet port are started, the high-pressure water is jetted out through the high-pressure water jet port after passing through the high-pressure water channel in the drill rod to cut the soil in the area to be reinforced at the bottom of the barrel type foundation;

[0022] (S5) The cement slurry jet port is started, and the high-pressure water jet port is alternately operated, the cement slurry is jetted out through the cement slurry jet port after passing through the cement slurry channel in the drill rod to reinforce the soil in the high-pressure water cutting area;

[0023] (S6) After the soil at the bottom of the barrel type foundation is reinforced, the cement slurry jet port and the high-pressure water jet port continue to be alternately operated to reinforce the soil in the barrel type foundation from bottom to top;

[0024] (S7) After the soil in the barrel type foundation is reinforced, the rotary jet sleeve, the cement slurry jet port, and the high-pressure water jet port are closed, and the drill rod is lifted to the top end of the rotary jet sleeve and the bottom surface of the top cover is flush;

[0025] (S8) After the negative pressure hole is disconnected from the negative pressure system, the negative pressure hole is opened to be connected with the atmosphere, the suction port is opened, the mud discharge system is started, and the rotary jet sleeve and the high-pressure water jet port are started again to cut and discharge the soil in the barrel type foundation; in the process of jetting out the high-pressure water by the high-pressure water jet port to cut the soil in the barrel, the drill rod is pushed down from top to bottom, and the mud-water mixture is discharged through the suction port and the mud discharge system;

[0026] (S9) After the soil in the barrel type foundation is cleaned, the suction port is closed, the mud discharge system, the rotary jet sleeve, and the high-pressure water jet port are stopped, the thixotropic mud pipe is disconnected from the thixotropic mud channel, the mud discharge pipe is disconnected from the mud discharge system, and the negative pressure sinking barrel cover with the cutter suction device is removed, and the barrel type foundation construction is completed.

[0027] Further, in the step (S2), the reamer head and the drill rod of the cutter suction device are rigid and play a guiding role to ensure that the barrel type foundation is vertically sunk downward;

[0028] The set value of the earth pressure sensor reading is the minimum pressure value of the injected thixotropic mud;

[0029] The thixotropic mud system is started, and the thixotropic mud is injected into the gap between the barrel sleeve and the soil through the thixotropic mud pipe, the thixotropic mud channel and the thixotropic mud outlet under pressure, so as to reduce the sinking resistance of the barrel foundation.

[0030] Further, in the steps (S4) and (S5), the drill rod is slowly lifted from bottom to top during the cutting and reinforcing of the soil at the bottom of the barrel foundation; the working time of the cement slurry injection port and the high-pressure water injection port is separately controlled, and the interval time of the cement slurry injection port and the high-pressure water injection port is alternately controlled, so as to prevent the disturbance of the barrel foundation.

[0031] Further, in the steps (S6) and (S7), the reinforcing height of the soil inside the barrel foundation is determined according to the seepage stability inside and outside the barrel foundation.

[0032] Further, in the steps (S4)-(S8), the pressure of the high-pressure water injected from the high-pressure water injection port and the high-pressure cement slurry liquid injected from the cement slurry injection port should be dynamically adjusted according to the design requirements.

[0033] The pressure of the high-pressure water injected from the high-pressure water injection port should meet the requirements of cutting the soil in the area to be reinforced; and the pressure of the high-pressure cement slurry liquid injected from the cement slurry injection port should meet the requirements of reinforcing the soil in the area to be reinforced.

[0034] Further, in the step (S9), the beneficial effects of the present application are:

[0035] The present application develops a resistance reduction system, and the thixotropic mud is pressed into the gap between the barrel sleeve and the soil through the thixotropic mud pipe, the thixotropic mud channel and the thixotropic mud outlet after being pressurized by the thixotropic mud system, so as to effectively reduce the sinking resistance of the barrel foundation, improve the sinking construction speed, save the construction period and achieve the engineering effect of efficient resistance reduction sinking.

[0036] The present application uses a thixotropic mud curing agent to cure the thixotropic mud in the gap between the barrel foundation and the soil after sinking to the specified elevation, so as to prevent the barrel foundation and the surrounding soil from being separated after sinking, even from being unstable and damaged, improve the overall stability of the barrel foundation, and reduce the risk of foundation settlement and displacement.

[0037] The present application develops a negative pressure sinking system with a cutter suction device, which assists the sinking of the barrel foundation through the method of combined cutter suction and negative pressure sinking. Specifically, the cutter head of the cutter suction device rotates to cut the soil and discharges the soil through the suction port and the soil discharge system, and the negative pressure system forms a pressure difference inside and outside the barrel foundation and a negative pressure hole to extract the soil and water in the barrel, so as to jointly assist the sinking of the barrel foundation, greatly improve the sinking efficiency, and ensure the vertical sinking of the barrel foundation by using the rigid cutter head and drill rod as a guide, so as to avoid the inclination of the barrel foundation and improve the vertical sinking effect of the barrel foundation.

[0038] The rotary jet sleeve in the application drives the cement slurry jetting port and the high-pressure water jetting port to rotate, wherein the high-pressure water jetting port can efficiently cut the soil in a large range, and the high-pressure cement slurry jetting port can reinforce the soil in a large range; by controlling the cement slurry jetting port and the high-pressure water jetting port to alternately work, the soil in a certain range inside and at the bottom of the barrel foundation is cut and then reinforced, so as to reduce the risk of seepage failure of the barrel foundation, improve the seepage stability and overall stability of the barrel foundation, and effectively control the deformation and uneven settlement of the barrel foundation during construction and long-term operation.

[0039] In addition to the function of cutting soil, the high-pressure water jetting port in the application can also clean the inside of the barrel foundation, which is beneficial to the installation of the internal structure and equipment of the barrel foundation, and can accelerate the overall delivery progress of the barrel foundation, thereby achieving remarkable engineering economic benefits.

[0040] In the application, the drill rod is lifted and lowered to assist in completing the engineering operations such as drilling, reaming, cutting and reinforcing soil, so as to improve the sinking construction efficiency and construction effect of the barrel foundation.

[0041] In the application, the reamer head can cut and break the stones in the soil, which can avoid the blockage of the pipeline by large-diameter gravel, and realize efficient and safe drilling operation.

[0042] The reaming type sinking installation technology for the barrel foundation with a drag reduction system is proposed in the application, which has a wide range of applications. From the common construction application, it is not only suitable for the installation of barrel foundations in water such as oceans, rivers and lakes, but also suitable for the installation of barrel foundations on land with high groundwater level. From the construction soil geological conditions, it is not only suitable for soft soil layers, but also suitable for gravel or stone layers, and can realize efficient and safe sinking construction of the barrel foundation under complex geological conditions. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 FIG. 1 is a sectional view of a barrel foundation with a drag reduction system and a negative pressure sinking system with a reaming device;

[0044] FIG. 2(a) is a schematic view of the barrel foundation with a drag reduction system before sinking installation;

[0045] FIG. 2(b) is a schematic view of the barrel foundation penetrating a specified depth while the drill rod drills into the area to be reinforced;

[0046] FIG. 2(c) is a schematic view of the high-pressure water cutting the soil at the bottom area of the barrel foundation after the drill rod continues to drill;

[0047] FIG. 2(d) is a schematic view of the cement outlet jetting cement from bottom to top to reinforce the soil at the bottom area of the barrel foundation;

[0048] Figure 2(e) is a schematic diagram of cement spraying from the cement outlet to continue reinforcing the soil inside the barrel foundation from bottom to top;

[0049] Figure 2(f) is a schematic diagram of the drill pipe being lifted to the top of the barrel foundation;

[0050] Figure 2(g) is a schematic diagram of high-pressure water being ejected from the drill rod and cutting the soil inside the bucket from top to bottom;

[0051] Figure 2(h) is a schematic diagram of the completed construction of the barrel foundation.

[0052] In the figure, the barrel-shaped foundation (1); drag reduction system (2), drag reduction barrel sleeve (2-1), thixotropic mud channel (2-2), thixotropic mud outlet (2-3), thixotropic mud pipe (2-4); slurry suction device (3), reamer head (3-1), cutter head (3-1-1), reamer blade (3-1-2), rotary jet sleeve (3-2), cement slurry injection port (3-2-1), high-pressure water injection port (3-2-2), mud suction port (3-2-3), drill rod (3-3), mud discharge pipe (3-4); negative pressure sinking barrel cover (4), top cover (4-1), negative pressure hole (4-2), fixing steel plate (4-3), sealing port (4-4), bolt (4-5). Detailed Implementation

[0053] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0054] like Figure 1 As shown, an embodiment of the present invention provides a barrel foundation with a drag reduction system, including a barrel foundation 1, a drag reduction system 2, and a negative pressure sinking system with a chuck suction device;

[0055] The drag reduction system 2 includes a drag reduction barrel sleeve 2-1, a thixotropic mud channel 2-2, a thixotropic mud outlet 2-3, a thixotropic mud pipe 2-4, and a thixotropic mud system;

[0056] The negative pressure sinking system with suction device includes suction device 3, negative pressure sinking barrel cover 4 and negative pressure system;

[0057] The reamer head 3 consists of a reamer head 3-1, a rotary jet sleeve 3-2, a drill rod 3-3, and a mud discharge pipe 3-4; the reamer head 3-1 includes a cutter head 3-1-1 and reamer blades 3-1-2; the rotary jet sleeve 3-2 is equipped with a cement slurry injection port 3-2-1, a high-pressure water injection port 3-2-2, and a mud suction port 3-2-3.

[0058] The negative pressure sinking barrel cover 4 includes a top cover 4-1, a negative pressure hole 4-2, a fixing steel plate 4-3, a sealing port 4-4, and bolts 4-5;

[0059] The drag-reducing sleeve 2-1 is tightly connected to the outside of the barrel-shaped base 1; the thixotropic mud channel 2-2 is set inside the barrel wall of the drag-reducing sleeve 2-1 and vertically penetrates the drag-reducing sleeve 2-1; the thixotropic mud outlets 2-3 are evenly distributed in the lower part of the drag-reducing sleeve 2-1 and communicate with the thixotropic mud channel 2-2 and the outside; the thixotropic mud pipe 2-4 penetrates the top cover 4-1, one end is connected to the thixotropic mud system, and the other end is connected to the thixotropic mud channel 2-2; the thixotropic mud system includes a thixotropic mud tank, a pressure pump, and a control valve;

[0060] The reamer head 3-1 consists of a cutter head 3-1-1 and reamer blades 3-1-2, connected to the lower end of the rotary jet sleeve 3-2 via the cutter head 3-1-1; the reamer blades 3-1-2 are located at the bottom of the reamer head 3-1 and connected to the cutter head 3-1-1; the rotary jet sleeve 3-2 is connected to the lower end of the drill rod 3-3, and is provided with a cement slurry injection port 3-2-1, a high-pressure water injection port 3-2-2, and a mud suction port 3-2-3; the cement slurry injection port 3-2-1 is divided into... The high-pressure water jet nozzle 3-2-2 is located on both sides of the outer wall of the rotary jet sleeve 3-2; the high-pressure water jet nozzle 3-2-2 is located below the cement slurry jet nozzle 3-2-1; the mud suction port 3-2-3 is located on the bottom end face of the drill rod, passing through the drill rod 3-3, the rotary jet sleeve 3-2, and the cutter head 3-1-1, and communicating with the mud discharge pipe 3-4; the mud discharge pipe 3-4 is located at the top of the top cover 4-1, with one end connected to the drill rod 3-3 and the other end connected to the mud discharge system; the drill rod 3-3 passes through the sealing port 4-4 and connects to the mud discharge pipe 3-4;

[0061] The top cover 4-1 is sealed and installed on the top of the barrel-shaped foundation 1; the top cover 4-1 is provided with a negative pressure hole 4-2 and a sealing port 4-4; the negative pressure hole 4-2 is connected to the negative pressure system; the fixed steel plate 4-3 is fixedly connected to the top cover 4-1 by several bolts 4-5; the sealing port 4-4 is used for sealing the drill rod 3-3 with the top cover 4-1 and the fixed steel plate 4-3.

[0062] The barrel-shaped foundation 1 is a steel barrel or an airtight concrete barrel; the top cover 4-1 is made of steel; the fixing steel plate 4-3 is set at the center of the top cover 4-1, which can reinforce the sealing port 4-4; the inner diameter of the sealing port 4-4 is the same as the outer diameter of the drill rod 3-3, the sealing port 4-4 is filled with rubber sealing material, and a fixing buckle is provided so that the drill rod 3-3 can be fixed at a set height.

[0063] The drag-reducing sleeve 2-1 is preferably tightly connected to the barrel foundation 1 with tie bolts; the strength of the drag-reducing sleeve 2-1 should meet the requirements for penetration and pressurized passage of thixotropic mud; the top cover 4-1 is sealed to the barrel foundation 1; the thixotropic mud channels 2-2 are evenly distributed circumferentially along the outer wall of the barrel foundation 1 inside the drag-reducing sleeve 2-1; the thixotropic mud outlets 2-3 are evenly distributed in the soil entry part of the drag-reducing sleeve 2-1, and soil pressure sensors are installed near the thixotropic mud outlets 2-3; a pressure valve is installed on the thixotropic mud pipe 2-4, and the pressure valve opens when the soil pressure monitored by the soil pressure sensor reaches the set value, and the thixotropic mud is injected into the contact surface between the drag-reducing sleeve 2-1 and the soil; the number of thixotropic mud channels 2-2 and thixotropic mud outlets 2-3 is determined by the soil properties and the size and weight of the barrel foundation.

[0064] The strength of the reamer head 3-1 meets the requirements for cutting rocks; the drill rod 3-3 is provided with a cement slurry channel, a high-pressure water channel, a mud discharge channel and a wire channel; the cement slurry channel, the high-pressure water channel and the mud discharge channel are respectively connected to the cement slurry injection port 3-2-1, the high-pressure water injection port 3-2-2 and the mud suction port 3-2-3; the rotary jet sleeve 3-2 and the cutter head 3-1-1 can be rotated independently.

[0065] This invention provides a hinged suction type sinking installation method for a barrel foundation with a drag reduction system, the method comprising the following steps:

[0066] S1. As shown in Figure 2(a), the barrel-shaped foundation 1 with drag-reducing barrel sleeve 2-1 is hoisted to the installation area and the negative pressure sinking barrel cover 4 with grouting device 3 is installed.

[0067] Connect negative pressure hole 4-2 to negative pressure system; connect mud discharge pipe 3-4 to mud discharge system; connect thixotropic mud system to thixotropic mud channel 2-2 through thixotropic mud pipe 2-4;

[0068] Lower drill rod 3-3 until the bottom surface of reamer head 3-1 is level with the bottom surface of barrel foundation 1;

[0069] S2. After the barrel foundation 1 has settled evenly under its own weight, open the negative pressure hole 4-2 and the sludge suction port 3-2-3, and start the negative pressure system and the cutter head 3-1 in the slurry suction device 3 and the sludge discharge system to continue to sink the barrel foundation 1.

[0070] When the earth pressure sensor reading near the thixotropic mud outlet 2-3 reaches the set value, the thixotropic mud system is activated to assist the settlement of the bucket foundation 1.

[0071] S3. As shown in Figure 2(b), after the barrel foundation 1 has been driven to the design elevation, close the negative pressure hole 4-2 and the mud suction port 3-2-3, stop the negative pressure system, replace the thixotropic mud with thixotropic mud curing agent, and after being pressurized by the thixotropic mud system, cure the thixotropic mud in the gap between the drag-reducing barrel sleeve 2-1 and the soil through the thixotropic mud pipe 2-4, the thixotropic mud channel 2-2, and the thixotropic mud outlet 2-3.

[0072] The reamer head 3-1 and the mud removal system continue to work, and the drill rod 3-3 continues to drill from top to bottom;

[0073] S4. When drill rod 3-3 has been drilled to the specified height, stop the reamer head 3-1 and the mud removal system;

[0074] As shown in Figure 2(c), start the jet grouting sleeve 3-2 and the high-pressure water jet nozzle 3-2-2. After passing through the high-pressure water channel inside the drill rod 3-3, the high-pressure water is sprayed out through the high-pressure water jet nozzle 3-2-2 to cut the soil in the bottom area of ​​the bucket foundation 1 to be reinforced.

[0075] S5. As shown in Figure 2(d), start the cement slurry injection port 3-2-1 and alternate with the high-pressure water injection port 3-2-2. After the cement slurry passes through the cement slurry channel in the drill rod 3-3, it is injected out through the cement slurry injection port 3-2-1 under high pressure to reinforce the soil in the high-pressure water cutting area.

[0076] S6. As shown in Figure 2(e), after the bottom soil of the bucket foundation 1 is reinforced, the cement grout injection port 3-2-1 and the high-pressure water injection port 3-2-2 continue to work alternately to reinforce the soil inside the bucket foundation 1 from bottom to top.

[0077] S7. As shown in Figure 2(f), after the soil inside the barrel foundation 1 is reinforced, close the jet grouting sleeve 3-2, cement slurry injection port 3-2-1, and high-pressure water injection port 3-2-2, and raise the drill rod 3-3 until the top of the jet grouting sleeve 3-2 is flush with the bottom surface of the top cover 4-1.

[0078] S8. As shown in Figure 2(g), after disconnecting the negative pressure hole 4-2 from the negative pressure system, open the negative pressure hole 4-2 to connect it to the atmosphere; open the mud suction port 3-2-3, start the mud discharge system, and restart the rotary jet sleeve 3-2 and the high-pressure water jet port 3-2-2 to cut and discharge the soil inside the bucket foundation 1; while the high-pressure water jet port 3-2-2 is cutting the soil inside the bucket, the drill rod 3-3 is pushed from top to bottom, and the mud-water mixture is discharged through the mud suction port 3-2-3 and the mud discharge system.

[0079] S9. After the soil inside the barrel foundation 1 has been cleaned, close the sludge suction port 3-2-3, stop the sludge discharge system, the jet grouting sleeve 3-2 and the high-pressure water jet port 3-2-2; disconnect the thixotropic mud pipe 2-4 from the thixotropic mud channel 2-2; disconnect the sludge discharge pipe 3-4 from the sludge discharge system; remove the negative pressure sinking barrel cover 4 with the suction device 3, as shown in Figure 2(f). The construction of the barrel foundation 1 is now complete.

[0080] In one embodiment, in step S2, the negative pressure system assists the sinking of the barrel foundation 1 by creating a pressure difference between the inside and outside of the barrel foundation and by drawing soil and water from the barrel through the negative pressure hole 4-2; the auger suction device 3 assists the sinking of the barrel foundation 1 by rotating the cutter head 3-1 to cut the soil inside the barrel foundation 1 and then discharging the soil and water through the suction port 3-2-3, the discharge pipe 3-4, and the discharge system; the cutter head 3-1 and the drill rod 3-3 of the auger suction device 3 are rigid and play a guiding role to ensure that the barrel foundation 1 sinks vertically downward;

[0081] The set value for the earth pressure sensor reading is the minimum pressure value for injecting thixotropic mud.

[0082] After the thixotropic mud system is started, the thixotropic mud is pressurized and injected into the gap between the drag-reducing barrel sleeve 2-1 and the soil through the thixotropic mud pipe 2-4, the thixotropic mud channel 2-2, and the thixotropic mud outlet 2-3, thereby reducing drag and allowing the barrel foundation 1 to settle. The pressurization value of the thixotropic mud is determined by design calculation based on the soil properties and the magnitude of water and soil pressure.

[0083] In steps S2 and S3, the reamer head 3-1 can cut and break up rocks in the soil.

[0084] In one embodiment, during steps S4 and S5, when cutting and reinforcing the soil at the bottom of the barrel foundation 1, the drill rod 3-3 is slowly raised from bottom to top; the individual operation time of the cement slurry injection port 3-2-1 and the high-pressure water injection port 3-2-2, as well as the time interval between the alternating operation of the cement slurry injection port 3-2-1 and the high-pressure water injection port 3-2-2, should be strictly controlled to prevent disturbance to the barrel foundation 1.

[0085] In one embodiment, in steps S6 and S7, the reinforcement height of the soil inside the barrel foundation 1 is determined by the seepage stability calculation of the barrel foundation 1; in step S8, after the soil inside the barrel foundation 1 is cut, the inside of the barrel foundation 1 can still be cleaned by high-pressure water, and the generated sewage is discharged through the sludge suction port 3-2-3 and the sludge discharge system; in steps S4-S8, the pressure of the high-pressure water sprayed from the high-pressure water jet port 3-2-2 and the high-pressure cement slurry sprayed from the cement slurry jet port 3-2-1 should be dynamically adjusted according to the design requirements; the pressure of the high-pressure water sprayed from the high-pressure water jet port 3-2-2 should meet the requirements of soil cutting in the area to be reinforced; the pressure of the high-pressure cement slurry sprayed from the cement slurry jet port 3-2-1 should meet the requirements of soil reinforcement in the area to be reinforced.

[0086] In one embodiment, in step S9, after the barrel foundation 1 is constructed, the internal bottom plate and barrel wall reinforcement of the barrel foundation can be carried out according to project needs, and the internal equipment can be installed.

[0087] This invention is applicable to the installation of barrel-shaped foundations 1 in water such as oceans, rivers, and lakes, and is also applicable to the installation of barrel-shaped foundations 1 in land areas with high groundwater levels.

[0088] The above embodiments are used to explain and illustrate the present invention, but not to limit the present invention. Any modifications and changes made to the present invention within the spirit and scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A barrel foundation with a drag reduction system, characterized in that: Includes a barrel-shaped foundation (1), a drag reduction system (2), and a negative pressure sinking system with a grout suction device; The drag reduction system (2) includes a drag reduction sleeve (2-1) with a thixotropic mud channel (2-2) and a thixotropic mud outlet (2-3), a thixotropic mud pipe (2-4), and a thixotropic mud system; the drag reduction sleeve (2-1) is tightly connected to the outside of the barrel-shaped foundation (1); the thixotropic mud channel (2-2) is set inside the barrel wall of the drag reduction sleeve (2-1), vertically penetrating the drag reduction sleeve (2-1), and communicating with the outside through the thixotropic mud outlet (2-3); the thixotropic mud outlet (2-3) is evenly distributed in the lower part of the drag reduction sleeve (2-1); one end of the thixotropic mud pipe (2-4) is connected to the thixotropic mud system, and the other end is connected to the thixotropic mud channel (2-2); the thixotropic mud system includes a thixotropic mud tank, a pressure pump, and a control valve; The negative pressure sinking system with suction device includes suction device (3), negative pressure sinking barrel cover (4) and negative pressure system; The slurry suction device (3) consists of a reamer head (3-1), a jet grouting sleeve (3-2), a drill rod (3-3), and a mud discharge pipe (3-4); the reamer head (3-1) includes a cutter head (3-1-1) with reamer blades (3-1-2) installed, used for cutting and breaking rocks in the soil; the cutter head (3-1-1) is installed at the lower end of the jet grouting sleeve (3-2); the jet grouting sleeve (3-2) is equipped with a cement slurry injection port (3-2-1). The high-pressure water jet nozzle (3-2-2) and the mud suction port (3-2-3) are located on the bottom end face of the drill rod (3-3), passing through the drill rod (3-3), the rotary jet sleeve (3-2), and the cutter head (3-1-1), and communicating with the mud discharge pipe (3-4); the rotary jet sleeve (3-2) is installed at the lower end of the drill rod (3-3), and the drill rod (3-3) passes through the sealing port (4-4) of the negative pressure sinking barrel cover (4) and is connected to the mud discharge pipe (3-4); The strength of the reamer head (3-1) meets the requirements for cutting rocks; the drill rod (3-3) is provided with a cement slurry channel, a high-pressure water channel, a mud discharge channel and a wire channel; the cement slurry channel, the high-pressure water channel and the mud discharge channel are respectively connected to the cement slurry injection port (3-2-1), the high-pressure water injection port (3-2-2) and the mud suction port (3-2-3); the rotary jet sleeve (3-2) and the cutter head (3-1-1) can rotate independently. The cement slurry injection nozzles (3-2-1) are distributed on both sides of the outer wall of the rotary jet sleeve (3-2); the high-pressure water injection nozzles (3-2-2) are located below the cement slurry injection nozzles (3-2-1); The negative pressure sinking barrel cover (4) includes a top cover (4-1) with a negative pressure hole (4-2) and a sealing port (4-4) and a fixed steel plate (4-3); the top cover (4-1) is sealed and installed on the top of the barrel base (1); the negative pressure hole (4-2) is connected to the negative pressure system; the sealing port (4-4) is used for the sealing connection between the drill rod (3-3) and the top cover (4-1) and the fixed steel plate (4-3).

2. A barrel foundation with a drag reduction system according to claim 1, characterized in that, The barrel-shaped foundation (1) is a steel barrel or an airtight concrete barrel; the top cover (4-1) is made of steel; the fixing steel plate (4-3) is set in the center of the top cover (4-1) to reinforce the sealing port (4-4); the fixing steel plate (4-3) is divided into upper and lower parts, which are installed on the upper and lower parts of the barrel cover respectively; the inner diameter of the sealing port (4-4) is the same as the outer diameter of the drill rod (3-3); the sealing port (4-4) is filled with rubber sealing material and a fixing buckle is provided so that the drill rod (3-3) can be fixed at a set height.

3. A barrel foundation with a drag reduction system according to claim 1, characterized in that, The drag-reducing sleeve (2-1) is tightly connected to the barrel foundation (1) using tie bolts; the strength of the drag-reducing sleeve (2-1) meets the requirements for penetration and pressurized passage of thixotropic mud; the top cover (4-1) is sealed to the barrel foundation (1); the thixotropic mud channels (2-2) are evenly distributed circumferentially along the outer wall of the barrel foundation (1) inside the drag-reducing sleeve (2-1); the thixotropic mud outlets (2-3) are evenly distributed in the soil-entry part of the drag-reducing sleeve (2-1), and soil pressure sensors are installed near the thixotropic mud outlets (2-3); a pressure valve is installed on the thixotropic mud pipe (2-4), and the pressure valve opens when the soil pressure monitored by the soil pressure sensor reaches the set value, and the thixotropic mud is injected into the contact surface between the drag-reducing sleeve (2-1) and the soil; the number of thixotropic mud channels (2-2) and thixotropic mud outlets (2-3) is determined by the soil properties and the size and weight of the barrel foundation.

4. A hinged suction type sinking installation method for a barrel foundation with a drag reduction system as described in any one of claims 1-3, characterized in that, The method includes the following steps: S1. Hoist the barrel-shaped foundation (1) with drag-reducing barrel sleeve (2-1) to the area to be installed, and install the negative pressure sinking barrel cover (4) with grout suction device (3). Connect the negative pressure hole (4-2) to the negative pressure system; connect the mud discharge pipe (3-4) to the mud discharge system; connect the thixotropic mud system to the thixotropic mud channel (2-2) through the thixotropic mud pipe (2-4); Lower the drill rod (3-3) until the bottom surface of the reamer head (3-1) is level with the bottom surface of the barrel foundation (1); S2. After the barrel foundation (1) has settled evenly under its own weight, open the negative pressure hole (4-2) and the sludge suction port (3-2-3), and start the negative pressure system and the cutter head (3-1) and sludge discharge system in the slurry device (3) to continue to sink the barrel foundation (1). When the reading of the soil pressure sensor near the thixotropic mud outlet (2-3) reaches the set value, the thixotropic mud system is started to assist the settlement of the bucket foundation (1); S3. After the barrel foundation (1) has been driven to the design elevation, close the negative pressure hole (4-2) and the mud suction port (3-2-3), stop the negative pressure system, replace the thixotropic mud with thixotropic mud curing agent, and after being pressurized by the thixotropic mud system, cure the thixotropic mud in the gap between the drag-reducing barrel sleeve (2-1) and the soil through the thixotropic mud pipe (2-4), the thixotropic mud channel (2-2), and the thixotropic mud outlet (2-3); The reamer head (3-1) and mud removal system continue to operate, and the drill rod (3-3) continues to drill from top to bottom; S4. When the drill rod (3-3) has been drilled to the specified height, stop the reamer head (3-1) and the mud removal system; Start the jet grouting sleeve (3-2) and the high-pressure water jet nozzle (3-2-2). The high-pressure water passes through the high-pressure water channel inside the drill rod (3-3) and is then sprayed out through the high-pressure water jet nozzle (3-2-2) to cut the soil in the bottom area of ​​the bucket foundation (1) to be reinforced. S5. Start the cement slurry injection port (3-2-1) and alternate with the high-pressure water injection port (3-2-2). After the cement slurry passes through the cement slurry channel in the drill rod (3-3), it is injected out at high pressure through the cement slurry injection port (3-2-1) to reinforce the soil in the high-pressure water cutting area. S6. After the bottom soil of the bucket foundation (1) is reinforced, the cement grout injection nozzle (3-2-1) and the high-pressure water injection nozzle (3-2-2) continue to work alternately to reinforce the soil inside the bucket foundation (1) from bottom to top. S7. After the soil inside the barrel foundation (1) is reinforced, close the jet grouting sleeve (3-2), cement grout injection port (3-2-1), and high-pressure water injection port (3-2-2), and raise the drill rod (3-3) until the top of the jet grouting sleeve (3-2) is flush with the bottom of the top cover (4-1); S8. After disconnecting the negative pressure hole (4-2) from the negative pressure system, open the negative pressure hole (4-2) to connect it to the atmosphere; open the mud suction port (3-2-3), start the mud discharge system, and restart the rotary jet sleeve (3-2) and high-pressure water jet port (3-2-2) to cut and discharge the soil inside the bucket foundation (1); while the high-pressure water jet port (3-2-2) is cutting the soil inside the bucket, the drill rod (3-3) is pushed from top to bottom to discharge the mud-water mixture through the mud suction port (3-2-3) and the mud discharge system. S9. After the soil inside the barrel foundation (1) is cleaned, close the sludge suction port (3-2-3), stop the sludge discharge system, the jet grouting sleeve (3-2) and the high-pressure water jetting port (3-2-2); disconnect the thixotropic mud pipe (2-4) from the thixotropic mud channel (2-2); disconnect the sludge discharge pipe (3-4) from the sludge discharge system; remove the negative pressure sinking barrel cover (4) with the suction device (3), and the construction of the barrel foundation (1) is completed.

5. The hinged suction type sinking installation method for a barrel foundation with a drag reduction system according to claim 4, characterized in that: In step S2, the cutter head (3-1) and drill rod (3-3) of the auger suction device (3) are rigid and play a guiding role to ensure that the barrel foundation (1) sinks vertically downward. The set value for the earth pressure sensor reading is the minimum pressure value for injecting thixotropic mud. After the thixotropic mud system is started, the thixotropic mud is pressurized and injected into the gap between the drag-reducing barrel sleeve (2-1) and the soil through the thixotropic mud pipe (2-4), the thixotropic mud channel (2-2), and the thixotropic mud outlet (2-3) to reduce drag and allow the barrel foundation (1) to settle. The pressurization value of the thixotropic mud is determined according to the soil properties and the magnitude of the water and soil pressure.

6. The hinged suction type sinking installation method for a barrel foundation with a drag reduction system according to claim 4, characterized in that, In steps S4 and S5, during the cutting and reinforcement of the soil at the bottom of the barrel foundation (1), the drill rod (3-3) is slowly raised from bottom to top; the individual operation time of the cement slurry injection port (3-2-1) and the high-pressure water injection port (3-2-2) and the time interval between alternating operation of the cement slurry injection port (3-2-1) and the high-pressure water injection port (3-2-2) are strictly controlled to prevent disturbance to the barrel foundation (1).

7. The hinged suction type sinking installation method for a barrel foundation with a drag reduction system according to claim 4, characterized in that, In steps S6 and S7, the reinforcement height of the soil inside the bucket foundation (1) is determined by the seepage stability inside and outside the bucket foundation (1).

8. The hinged suction type sinking installation method for a barrel foundation with a drag reduction system according to claim 4, characterized in that, In steps S4-S8, the pressure of the high-pressure water ejected from the high-pressure water jet nozzle (3-2-2) and the high-pressure cement slurry ejected from the cement slurry jet nozzle (3-2-1) should be dynamically adjusted according to the design requirements. The high-pressure water jet from the high-pressure water jet nozzle (3-2-2) should meet the requirements for cutting the soil in the area to be reinforced; the pressure of the high-pressure cement slurry jet from the cement slurry jet nozzle (3-2-1) should meet the requirements for reinforcing the soil in the area to be reinforced.

9. The hinged suction type sinking installation method for a barrel foundation with a drag reduction system according to claim 4, characterized in that, In step S9, after the construction of the barrel foundation (1) is completed, the internal bottom plate and barrel wall of the barrel foundation are reinforced according to the needs of the project, and the internal equipment is installed.

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