CN221523660U - Thixotropic slurry drag reduction sleeve model for barrel-type foundation negative pressure sinking penetration research - Google Patents

Abstract

The utility model discloses a thixotropic slurry drag reduction sleeve model for barrel-type foundation negative pressure penetration research, which comprises a thixotropic slurry drag reduction sleeve and a thixotropic slurry system; the thixotropic slurry drag reduction sleeve is sleeved outside the barrel-type basic model device to form a submerged whole; soil and water are arranged in the model box to simulate penetration environmental conditions; the model device simulates a penetration process in a model box through air suction and negative pressure; the thixotropic slurry drag reducing sleeve is internally provided with a top circumferential channel and a vertical conveying pipe, the lower part of the thixotropic slurry drag reducing sleeve is provided with a slurry outlet, and after the model device is immersed into soil body to a certain depth, thixotropic slurry can be injected between the model and the soil body through a thixotropic slurry system to realize drag reduction optimization penetration. The thixotropic slurry drag reduction sleeve can solve the problem of penetration resistance and difficult penetration, and facilitates the research work of penetration drag reduction efficiency of the thixotropic slurry.

Description

A thixotropic mud drag reduction sleeve model for the study of negative pressure penetration of barrel foundation

Technical Field

The utility model relates to the field of marine engineering construction, in particular to a thixotropic mud drag reduction sleeve model used for research on negative pressure penetration of barrel foundations.

Background Art

Bucket foundation technology has been widely used against the background of the continuous expansion of my country's marine economic development space, further improvement of comprehensive strength and quality efficiency, and the increasing number of artificial island construction, expansion of wharf islands along the mainland coast, and cross-sea bridges.

The principle of bucket foundation penetration is to use the pressure difference inside and outside the bucket to achieve penetration. This penetration method can reduce damage to the soil, have less impact on the environment, and have low energy consumption. During the bucket foundation penetration process, it is subject to penetration resistance, which is composed of friction between the inner and outer walls and resistance at the end of the bucket. Suction penetration is difficult in coarse sand or hard clay soil, and it is difficult to achieve the effect of seepage to reduce resistance, resulting in reduced penetration efficiency and reduced efficiency of marine engineering construction.

Therefore, in order to improve the quality and efficiency of marine engineering construction, a drag reduction device is needed to improve the penetration efficiency of barrel foundations. The method of using field measurements to study the engineering feasibility of the device and various penetration parameters has problems such as complex process, long cycle, and high material and manpower consumption. Compared with the field measurement method, an indoor scaled-down model test can be used, which has the advantages of convenient and fast operation, low economic cost, short analysis time, and controllable load. It reduces the cost of the preliminary research stage, obtains the optimal penetration plan, and better serves marine engineering construction. Based on the indoor scaled-down model test of barrel foundation negative pressure drag reduction penetration, a thixotropic mud drag reduction sleeve model for barrel foundation negative pressure penetration research is urgently needed.

Utility Model Content

The utility model aims to address the deficiencies of the prior art and to propose a thixotropic mud drag reduction sleeve model for research on negative pressure penetration of a barrel foundation.

The purpose of the utility model is achieved through the following technical solutions: a thixotropic mud drag reduction sleeve model for barrel foundation negative pressure penetration research, comprising a thixotropic mud drag reduction sleeve, a thixotropic mud system, a barrel foundation model device and a model box;

The thixotropic mud drag reduction sleeve is sleeved on the outside of the barrel-shaped foundation model device, and the lower end is connected to the barrel-shaped foundation model device by a bottom plate to form a whole; a blade foot is provided under the bottom plate to facilitate cutting into the soil;

The top of the thixotropic mud drag reduction sleeve is provided with a mud conveying interface connected to the thixotropic mud system, and an annular cavity is provided in the upper side wall to form a top annular channel; the top of the top annular channel is connected to the mud conveying interface, and the bottom is provided with a vertical conveying pipe connected to the slurry outlet for discharging the thixotropic mud;

The thixotropic mud system comprises thixotropic mud, a mud pipeline and a pressurizing device, wherein the mud pipeline is connected to a mud conveying interface to convey the thixotropic mud;

A barrel cover is installed on the top of the barrel-shaped basic model device to form a sealed body, and an air extraction hole is arranged on the barrel cover to achieve negative pressure sinking;

The model box is filled with soil and water for simulating sinking environmental conditions.

Furthermore, the thixotropic mud drag reduction sleeve is used for the study of thixotropic mud drag reduction efficiency, ensuring that the inner diameter of the thixotropic mud drag reduction sleeve is the same as the outer diameter of the barrel-type foundation model device used in the experimental study to ensure a close contact, and the lower end bottom plate is connected to the barrel-type foundation model device to prevent the barrel-type foundation model device from detaching from the thixotropic mud drag reduction sleeve during the penetration process, thereby achieving synchronous penetration.

Furthermore, the vertical conveying pipes and the slurry outlets are evenly distributed in the circumferential direction, and the specific number is determined according to factors such as research conditions, slurry output, and outer diameter of the barrel foundation.

Furthermore, a one-way valve is provided at the slurry outlet to prevent water in the soil from flowing into the drag reduction sleeve and to control the flow rate according to specific experimental conditions.

Furthermore, the slurry outlet is arranged on the side wall of the thixotropic mud drag reduction sleeve below the soil body after penetration, so as to realize thixotropic mud transportation when the thixotropic mud system is pressurized.

Furthermore, the thixotropic mud drag reduction sleeve is used for the study of thixotropic mud penetration drag reduction efficiency. If the size of the barrel-type foundation model device under study needs to be adjusted, the size of the thixotropic mud drag reduction sleeve is changed accordingly, and the manufacture is simple. The opening and closing of the one-way valve is also used to change the actual number of vertical conveying pipes and slurry outlets of the thixotropic mud drag reduction sleeve, which is convenient for control experiments.

Beneficial effects of the utility model:

1. The utility model adopts a thixotropic mud drag reduction sleeve to realize a barrel-type foundation penetration drag reduction model test related to the thixotropic mud penetration drag reduction efficiency. Compared with the conventional method of pre-burying a thixotropic mud channel on a barrel-type foundation, there is no need to newly manufacture a barrel-type foundation due to the optimization of the thixotropic mud drag reduction channel design. In addition, it is difficult and time-consuming to manufacture a thixotropic mud channel on a barrel-type foundation. A separate thixotropic mud drag reduction sleeve can adjust the design parameters such as the size of the top annular channel 1-2, the vertical conveying pipe 1-3, the slurry outlet 1-4, and the number of the vertical conveying pipe 1-3 and the slurry outlet 1-4 according to the needs of test repetition. It is flexible and simple and saves research time.

2. The thixotropic mud drag reduction sleeve in the utility model includes a mud conveying interface, a top annular channel, a vertical conveying pipe, and a slurry outlet, which can realize uniform injection of thixotropic mud to ensure uniform settlement of the barrel foundation, and form a thixotropic mud drag reduction layer on the outer side of the barrel wall to reduce the penetration resistance, which can effectively improve the penetration efficiency and realize drag-reduced penetration.

3. In the utility model, a blade foot is arranged at the bottom of the thixotropic mud drag reduction sleeve, which can cut the soil at the bottom of the bucket foundation to assist the bucket foundation to sink quickly, thereby further improving the sinking efficiency and achieving the purpose of drag reduction sinking.

4. A one-way valve is provided at the slurry outlet of the utility model to prevent soil particles and groundwater from being pressed into the drag reduction sleeve during the penetration process, thereby contaminating the thixotropic mud in the drag reduction sleeve and affecting the penetration drag reduction effect; further, according to the drag reduction demand, the slurry outlet can be reasonably controlled by adjusting the pressure of the thixotropic mud injected by the thixotropic mud system, adjusting the size of the one-way valve opening, etc., to ensure the stability of the penetration and improve the accuracy of the test.

5. The dimensions of the top annular channel, vertical conveying pipe and slurry outlet or the number of vertical conveying pipes and slurry outlets in the utility model can be reasonably designed according to factors such as research conditions, slurry discharge volume and outer diameter of the barrel foundation, and the utility model has strong applicability, ensuring uniform injection of thixotropic mud and giving full play to the drag reduction effect of thixotropic mud.

6. The thixotropic mud drag reduction sleeve in the utility model is used for the study of thixotropic mud penetration drag reduction efficiency. If the size of the barrel-type foundation model device under study needs to be adjusted, the size of the thixotropic mud drag reduction sleeve can be redesigned and changed. The 3D printing method is simple to manufacture and has strong flexibility. According to the research content, the actual use of the vertical conveying pipe and the slurry outlet of the thixotropic mud drag reduction sleeve can be changed by controlling the switch of the one-way valve at the slurry outlet. When the one-way valve is closed, the thixotropic mud enters the unused vertical conveying pipe to fill the pipe without affecting the normal slurry discharge from other channels, which is convenient for control experiments and obtaining the optimal penetration drag reduction scheme, which is conducive to the smooth progress of experimental research.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a thixotropic mud drag reduction sleeve model for barrel foundation negative pressure penetration research provided by an embodiment of the utility model;

FIG2 is a cross-sectional view 1-1 of a thixotropic mud drag reduction sleeve model for barrel foundation negative pressure penetration research provided by an embodiment of the utility model;

FIG3 is a cross-sectional view 2-2 of a thixotropic mud drag reduction sleeve model for barrel foundation negative pressure penetration research provided by an embodiment of the utility model;

Among them: thixotropic mud drag reduction sleeve 1, mud conveying interface 1-1, top annular channel 1-2, vertical conveying pipe 1-3, slurry outlet 1-4, bottom plate 1-5, blade foot 1-6, thixotropic mud system 2, barrel-type foundation model device 3, barrel cover 3-1, model box 4, soil body 4-1;

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the single embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

As shown in FIG1 , the utility model provides a thixotropic mud drag reduction sleeve model for barrel foundation negative pressure penetration research, comprising a thixotropic mud drag reduction sleeve 1, a thixotropic mud system 2, a barrel foundation model device 3 and a model box 4;

The thixotropic mud drag reduction sleeve 1 is sleeved on the outside of the barrel-shaped basic model device 3, and the lower end is connected to the barrel-shaped basic model device 3 by the bottom plate 1-5 to form a whole; a blade foot 1-6 is provided below the bottom plate 1-5 to facilitate cutting into the soil;

The top of the thixotropic mud drag reduction sleeve is provided with a mud conveying interface 1-1 connected to the thixotropic mud system 2, and an annular cavity is provided in the upper side wall to form a top annular channel 1-2; the top of the top annular channel 1-2 is connected to the mud conveying interface 1-1, and the bottom is provided with a vertical conveying pipe 1-3 connected to the slurry outlet 1-4 for discharging thixotropic mud;

The thixotropic mud system 2 includes thixotropic mud, a mud pipeline and a pressurizing device, and the mud pipeline is connected to the mud conveying interface 1-1 to convey the thixotropic mud;

The barrel-shaped basic model device 3 is provided with a barrel cover 3-1 on the top to form a sealed body, and an air extraction hole is arranged on the barrel cover 3-1 to achieve negative pressure sinking;

The model box 4 is filled with soil 4-1 and water for simulating sinking environmental conditions.

As shown in Fig. 1, the thixotropic mud drag reduction sleeve 1 includes a mud delivery interface 1-1, a top annular channel 1-2, a vertical delivery pipe 1-3, a slurry outlet 1-4, a bottom plate 1-5, and a blade foot 1-6; the mud delivery interface 1-1 is connected to the thixotropic mud system 2; when conducting a study on the thixotropic mud penetration drag reduction efficiency, the thixotropic mud drag reduction sleeve 1 is placed on the barrel-type foundation model device 3, the barrel cover 3-1 is installed and placed on the soil 4-1 of the model box 4, and the negative pressure is pumped for penetration. When the slurry outlet 1-4 is located below the soil 4-1, the thixotropic mud system 2 is controlled to deliver the thixotropic mud to the top annular channel 1-2 and the vertical delivery pipe 1-3, the vertical delivery pipe 1-3 is connected to the slurry outlet 1-4, and then the thixotropic mud is injected into the outer side of the barrel wall through the dense slurry outlet 1-4 to reduce the friction between the thixotropic mud and the soil.

As shown in FIG. 2 , the top annular channel 1 - 2 of the thixotropic mud drag reduction sleeve 1 can evenly distribute the thixotropic mud and is connected to the vertical conveying pipe 1 - 3 to convey the thixotropic mud.

As shown in FIG3 , the vertical conveying pipe 1 - 3 and the slurry outlet 1 - 4 of the thixotropic mud drag reduction sleeve 1 are connected, and the number and size of the vertical conveying pipe 1 - 3 and the slurry outlet 1 - 4 are reasonably designed according to the research conditions, slurry discharge volume and the outer diameter of the barrel-type foundation model.

The working process of the utility model is as follows:

In the study of thixotropic mud penetration drag reduction efficiency, a drag reduction sleeve model is used, and a thixotropic mud drag reduction sleeve 1 is manufactured by 3D printing technology to ensure that the inner diameter of the thixotropic mud drag reduction sleeve 1 is consistent with the outer diameter of the barrel-type basic model device 3, and then the thixotropic mud drag reduction sleeve 1 is sleeved on the outside of the barrel-type basic model device 3. When it is difficult to insert, lubricating oil can be used to reduce friction to ensure smooth insertion. If the gap is too large, material can be filled in the gap to ensure full contact; the lower end has a bottom plate 1-5 connected to the barrel-type basic model device 3; the mud conveying interface 1-1 is connected to the thixotropic mud system 2.

The assembled model device is placed on the soil 4-1 in the model box 4, and the verticality and position are adjusted. The model device is left to stand for a period of time so that the model device sinks to a certain depth under the action of gravity.

The barrel-type foundation model device 3 sinks together with the thixotropic mud drag reduction sleeve 1 by installing the top cover 3-1 to extract negative pressure. When the slurry outlets 1-4 are all located below the soil 4-1, the thixotropic mud system 2 is controlled to be pressurized to realize thixotropic mud transportation. The thixotropic mud is transported to the top annular channel 1-2 and the vertical conveying pipe 1-3, and then the thixotropic mud is evenly injected between the barrel wall and the soil through the slurry outlet 1-4. A one-way valve is set at the slurry outlet 1-4 to prevent soil and water from entering the thixotropic mud drag reduction sleeve 1.

When the barrel-type basic model device 3 is sunk to the designated position, the thixotropic mud system 2 stops working, the mud pipeline is removed, the negative pressure of the barrel-type basic model device 3 stops, and the indoor sinking test process is completed. After the test is completed, the model device can be pulled out and the test can be repeated.

According to the test results, the number of connections between the vertical conveying pipes 1-3 and the slurry outlets 1-4 can be optimized by adjusting the number of one-way valves opened and closed. The 3D printing model is used for quick and easy production, which improves the test efficiency. According to the research content, the actual use of the vertical conveying pipes and the slurry outlets of the thixotropic mud drag reduction sleeve can be changed by controlling the switch of the one-way valve at the slurry outlet. When the one-way valve is closed, the thixotropic mud enters the unused vertical conveying pipes to fill the pipes without affecting the normal slurry discharge from other channels, which is convenient for control tests and the optimal penetration drag reduction scheme can be obtained.

The above embodiments are used to illustrate the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims (6)

1. The thixotropic slurry drag reduction sleeve model for the barrel-type foundation negative pressure sinking penetration study is characterized by comprising a thixotropic slurry drag reduction sleeve, a thixotropic slurry system and a model box;

the thixotropic slurry drag reduction sleeve is sleeved outside the barrel-type basic model device, and the lower end of the thixotropic slurry drag reduction sleeve is connected with the barrel-type basic model device through the bottom plate to form a whole; a cutting edge foot is arranged below the bottom plate, the cutting is convenient for entering the soil;

The thixotropic slurry drag reduction sleeve is provided with a slurry conveying interface at the top part and is connected with a thixotropic slurry system, an annular cavity is formed in the side wall of the upper part to form a top annular channel; the top end of the top circumferential channel is communicated with the slurry conveying interface, and the bottom is provided with a vertical conveying pipe which is communicated with the slurry outlet and used for discharging thixotropic slurry;

The thixotropic slurry system comprises thixotropic slurry, a slurry pipeline and a pressurizing device, wherein the slurry pipeline is connected with the slurry conveying interface to convey the thixotropic slurry;

a barrel cover is arranged at the top of the barrel-type basic model device to form a sealing body, and an air suction hole is arranged on the barrel cover for realizing negative pressure penetration;

the model box is internally provided with soil and water for simulating penetration environmental conditions.

2. The thixotropic slurry drag reduction sleeve model for the barrel-type foundation negative pressure penetration study, which is disclosed in claim 1, is characterized in that the thixotropic slurry drag reduction sleeve is used for thixotropic slurry drag reduction efficiency study, the inner diameter of the thixotropic slurry drag reduction sleeve is ensured to be the same as the outer diameter of a barrel-type foundation model device adopted in the experimental study, so that contact is closed, a lower end bottom plate is connected with the barrel-type foundation model device to prevent the barrel-type foundation model device from being separated from the thixotropic slurry drag reduction sleeve in the penetration process, and synchronous penetration is realized.

3. The thixotropic slurry drag reduction sleeve model for the barrel-type foundation negative pressure penetration study of claim 1, wherein the vertical conveying pipe and the slurry outlet are uniformly distributed in the circumferential direction.

4. The thixotropic slurry drag reducing sleeve model for the barrel-type foundation negative pressure penetration study of claim 1, wherein the slurry outlet is provided with a one-way valve.

5. The thixotropic slurry drag reducing sleeve model for the barrel-type foundation negative pressure penetration study of claim 1, wherein the slurry outlet is arranged at the side wall position of the thixotropic slurry drag reducing sleeve below the soil body after penetration.

6. A thixotropic slurry drag reducing sleeve model for use in barrel foundation negative pressure penetration research according to claim 1, wherein the thixotropic slurry drag reducing sleeve size is adjusted according to barrel foundation model device size.