Penetrating equipment for barrel type foundation

Abstract

The utility model discloses penetration equipment for a barrel type foundation. The penetration equipment comprises a water pumping penetration system and an air pumping penetration system, the water pumping penetration system comprises a water inlet pipe, a frame, a submersible pump, a water valve and a water drainage pipe, wherein the water inlet pipe is inserted into a water opening formed in the bucket type foundation top cover, and the lower end opening of the water inlet pipe is lower than the bottom face of the bucket type foundation top cover; the frame is installed on the bucket type foundation top cover; the submersible pump is fixed in the frame; the inlet end of the water valve is connected with a water pump water inlet end with a sealing ring on the upper portion, and the lower portion of the water pump water inlet end is inserted into the top inner cavity of the water inlet pipe so that the sealing ring can seal the top end of the water inlet pipe. The air exhaust penetration system comprises an air inlet pipe inserted in an air opening formed in the barrel type foundation top cover, a vacuum pump installed on the construction ship, an air valve installed on an air outlet connector of the vacuum pump and a corrugated pipe connected between the air valve and the air inlet pipe. According to the utility model, the penetration capacity of the bucket foundation can be greatly improved in a near-shore shallow sea area.

Description

Technical Field

[0001] The utility model relates to a sinking device for a barrel-type foundation. Background Art

[0002] The barrel foundation is a new type of hydraulic foundation structure with an open bottom and a closed top. It can form a pressure difference inside and outside the barrel by pumping water, overcome resistance and achieve sinking. It is particularly suitable for soft clay seabeds. It has the advantages of no need for large equipment for water construction and sinking, short water operation time, and no noise during construction. It is used in marine engineering and water transport engineering. The structure of a typical barrel foundation 10 includes a foundation top cover 11 and a foundation side wall. At present, the sinking equipment of the barrel foundation 10 is usually composed of an equipment frame 22, a submersible pump 20, a water valve 23, a pressure gauge 26 and a flow meter 27; the water valve 23 controls the connection state of the water inside and outside the barrel, and the submersible pump 20 pumps water to achieve sinking. The pressure gauge 26 and the flow meter 27 monitor the pressure in the barrel and the pumping flow rate and other construction parameters. Among them, the submersible pump 20 is fixed in the frame 21; the pressure gauge 26 is installed on the pipeline in front of the water inlet of the water pump submersible pump 20, and the flow meter 27 is installed on the drain pipe 25 behind the water outlet of the water pump; the water inlet of the submersible pump 20 is connected to the water valve 23, and the water valve 23 can adopt a hydraulic valve or a solenoid valve to meet the valve opening and closing state control; the water pump water inlet end 24 adopts a hollow structure and serves as a guide. The water pump water inlet end 24 can be inserted into the water pump installation interface 211 reserved on the barrel-type foundation top cover 11 (see Figure 1 ).

[0003] When the barrel foundation sinks by its own weight, the pressure of the water (or gas) in the barrel is greater than the external environmental water pressure (or air pressure), and the water or gas is discharged from the barrel through the water inlet of the submersible pump. The submersible equipment is subjected to the upward force caused by the pressure difference between the inside and outside of the barrel (according to the water inlet pipe diameter of 150mm, the internal and external pressure difference is 100kPa, and the upward force is 1.8kN), which is far from enough to overcome the gravity of the submersible equipment (generally above 5kN). During the pumping operation, the water pressure in the barrel is lower than the external environmental water pressure, and the submersible equipment is subjected to the downward pressure caused by the pressure difference between the inside and outside of the barrel, and is further compressed with the water pump installation interface. Therefore, for the submersible equipment without water injection and lifting function, it is generally not necessary to set a locking mechanism between the submersible equipment and the barrel foundation top cover. Although the water pump inlet end and the water pump installation interface on the barrel foundation top cover are not completely sealed, the pumping flow rate of the submersible pump under normal working conditions is also much greater than the leakage at the water pump interface, which has no significant effect on the pumping and sinking of the barrel foundation. It should be pointed out that conventional barrel foundation sinking equipment requires that the inlet end of the water inlet pipe pre-installed on the barrel foundation top cover be flush with the bottom surface of the foundation top cover so that the gas in the barrel can be completely discharged during the barrel foundation self-weight sinking stage to facilitate subsequent submersible pumping operations.

[0004] Note that the penetration capacity of the submersible pump is not only related to the head of the submersible pump, but also affected by the depth of the surrounding water. Theoretically, the minimum absolute pressure inside the barrel that can be reached by the submersible pump is one standard atmospheric pressure, and the absolute pressure outside the barrel is the sum of one standard atmospheric pressure and the ambient water pressure (water depth × water density). That is, the maximum pressure difference that can be formed is the water pressure corresponding to the ambient water depth (see Figure 2 ). In nearshore and shallow waters, when the geology is hard or the length-to-diameter ratio of the bucket foundation is large, it may be impossible to install the bucket foundation to the designed elevation by pumping water alone.

[0005] When installing a barrel foundation in shallow water near the coast, a vacuum pump can also be used to evacuate air to achieve submersion. The vacuum pump 30 generally works on water (can be arranged on the installation ship). An air intake pipe 31 is pre-installed on the barrel foundation top cover 11. The exhaust pipe 31 is connected to the vacuum pump 30 through a bellows 33. A manual air valve 32 is set to control the exhaust state, and a pressure sensor 35 is set to monitor the air pressure in the barrel (see Figure 3 ). It should be pointed out that vacuum pumping is only applicable to the working condition where there is still gas inside the barrel foundation, that is, the top of the barrel is not submerged in water, and the upper limit of the theoretical pressure difference formed by vacuuming is one standard atmospheric pressure, that is, the water pressure that can be generated at a water depth of 10m. In addition, the vacuum pumping efficiency is lower than the water pumping efficiency of the submersible pump, and it cannot operate continuously for a long time. In summary, due to the limitations of equipment performance and applicable environment, vacuum pumps are rarely used in the installation of barrel foundation sinking.

[0006] In summary, the existing barrel foundation sinking equipment has very limited sinking capacity in nearshore shallow waters: the sinking capacity formed by conventional submersible pumps is limited by the water depth, and there may be a problem of insufficient sinking capacity of the barrel foundation. The sinking capacity formed by conventional submersible pumps is the water pressure corresponding to the ambient water depth. Taking a water depth of 15m as an example, the sinking capacity of the submersible pump is only 150kPa; the sinking capacity formed by the vacuum pump through vacuuming is not limited by the water depth. Taking a water depth of 15m as an example, the sinking capacity of the vacuum pump is 100kPa, but its upper limit is a standard atmospheric pressure, that is, it is stronger than the sinking capacity of the submersible pump only in sea areas with a water depth of less than 10m. In addition, the vacuum pump has the limitations of low air extraction efficiency, inability to operate continuously for a long time, and only applicable to working conditions where the top cover of the barrel foundation is not submerged in water.

[0007] If it is not possible to penetrate the barrel into place using submersible penetration equipment in shallow waters near the coast, it is necessary to use a ballast device or install water injection and air drag reduction devices on the side walls and ends of the barrel foundation. Although the ballast device can be reused, it will greatly increase the amount of lifting operations on the crane ship. The air drag reduction device cannot be recovered. Both need to be prepared in advance and are costly. Utility Model Content

[0008] The utility model aims to overcome the defects of the prior art and provide a bucket foundation sinking device, which can greatly increase the sinking capacity of the bucket foundation in near-shore shallow waters.

[0009] The purpose of the utility model is achieved as follows: a barrel-type foundation sinking device, including a water pumping sinking system and an air pumping sinking system; wherein,

[0010] The pumping and submerging system comprises a water inlet pipe, a frame, a submersible pump, a water valve and a drain pipe; the water inlet pipe is inserted into the water inlet opened on the barrel-type foundation top cover, and the lower end of the water inlet pipe is lower than the bottom surface of the barrel-type foundation top cover; the frame is installed on the barrel-type foundation top cover; the submersible pump is fixed in the frame; the outlet end of the water valve is connected to the water inlet interface of the submersible pump, and the inlet end of the water valve is connected to the water inlet end of the water pump, a sealing ring is installed on the upper part of the water inlet end of the water pump, and the lower part of the water inlet end of the water pump is inserted into the top inner cavity of the water inlet pipe, so that the sealing ring seals the top end of the water inlet pipe; the drain pipe is connected to the drainage interface of the submersible pump;

[0011] The air extraction and penetration system includes an air inlet pipe, a vacuum pump, an air valve and a bellows; the air inlet pipe is inserted into the air port opened on the barrel-type foundation top cover; the vacuum pump is installed on the construction vessel; the air valve is installed on the air outlet interface of the vacuum pump; the bellows is connected between the air valve and the air inlet pipe.

[0012] The above-mentioned barrel-based sinking equipment, wherein the pumping and sinking system also includes a water pressure gauge installed between the outlet end of the water valve and the water inlet interface of the submersible pump, and a flow meter installed on the drain pipe.

[0013] The above-mentioned barrel foundation sinking equipment, wherein the air extraction sinking system also includes a pressure gauge installed between the air valve and the bellows.

[0014] The characteristic of the bucket foundation sinking equipment of the utility model is that it adopts a combined sinking equipment of a water pumping sinking system and an air pumping sinking system, which can change the upper limit of the sinking capacity from the ambient water depth pressure (water pumping) or one standard atmospheric pressure (air pumping) to the ambient water depth pressure + one standard atmospheric pressure, thereby greatly increasing the sinking capacity of the bucket foundation in shallow waters near the coast, without adopting other additional measures to assist the sinking of the bucket foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a bucket foundation sinking equipment in the prior art;

[0016] Figure 2 yes Figure 1 A working state diagram of a bucket foundation sinking equipment;

[0017] Figure 3 It is a structural schematic diagram of another bucket foundation sinking equipment in the prior art;

[0018] Figure 4 It is a structural schematic diagram of the bucket foundation sinking equipment of the utility model;

[0019] Figure 5a It is a state diagram of the barrel foundation sinking device of the utility model when performing step 1 when in use;

[0020] Figure 5b It is a state diagram of the barrel foundation sinking device of the utility model when performing step 2 when in use;

[0021] Figure 5c It is a state diagram of the barrel foundation sinking device of the utility model when performing step three when in use;

[0022] Figure 5d It is a state diagram of the barrel foundation sinking device of the utility model when performing step 4 in use;

[0023] Figure 5e It is a state diagram of the barrel foundation sinking device of the utility model when performing step five when in use. DETAILED DESCRIPTION

[0024] The utility model will be further described below in conjunction with the accompanying drawings.

[0025] See also Figure 4 The utility model discloses a barrel foundation sinking device, which includes a water pumping sinking system and an air pumping sinking system.

[0026] The pumping and sinking system includes an air inlet pipe 21, a frame 22, a submersible pump 20, a water valve 23, a drain pipe 25, a water pressure gauge 26 and a flow meter 27; wherein the water inlet pipe 21 is inserted into the water pumping port opened on the barrel-type foundation top cover 11, and the lower end of the water inlet pipe 21 is lower than the bottom surface of the barrel-type foundation top cover 11; the frame 22 is installed on the barrel-type foundation top cover 11; the submersible pump 2 is fixed in the frame 22; the outlet end of the water valve 23 is installed on the water inlet interface of the submersible pump 20, and the inlet end of the water valve 23 is connected to the water inlet interface of the submersible pump 20. A water pump water inlet terminal 224 is connected, a sealing ring 240 is installed on the upper part of the water pump water inlet terminal 24, and the lower part of the water pump water inlet terminal 24 is inserted into the top inner cavity of the water inlet pipe 21, so that the sealing ring 240 seals the top of the water inlet pipe 21; a drain pipe 25 is connected to the drain interface of the submersible pump 20, and the diameter of the drain pipe 25 is greater than DN150; a water pressure gauge 26 is installed between the outlet end of the water valve 23 and the water inlet interface of the submersible pump 20; a flow meter 27 is installed on the drain pipe 24.

[0027] The air extraction and penetration system includes an air intake pipe 31, a vacuum pump 30, an air valve 32, a bellows 33 and a barometer 35; wherein, the air intake pipe 31 is inserted into the air extraction port opened on the barrel-type foundation top cover 11; the vacuum pump 30 is installed on the construction vessel; the air valve 32 is installed on the air outlet interface of the vacuum pump 30; the upper end of the bellows 33 is connected to the air valve 32 through a flange 34, and the lower end of the bellows 33 is connected to the top of the air intake pipe 31, and the diameter of the bellows 33 is DN50; the barometer 35 is installed between the air valve 32 and the bellows 33.

[0028] The bucket foundation sinking device of the utility model comprises the following steps when in use:

[0029] 1. Install the pumping and sinking system on the barrel foundation top cover 11 in the prefabrication yard, and connect the water pump water inlet end 24 to the water inlet pipe 21 tightly; install the air extraction and sinking system on the installation ship, and when the barrel foundation and the pumping and sinking system are transported to the vicinity of the installation sea area of ​​the barrel foundation, connect the metal bellows 33 connected to the air inlet pipe 31 on the barrel foundation top cover 11 to the air extraction and sinking system through the flange 34. After the sinking equipment is debugged, open the air valve 32 and the water valve 23, and then use the main crane on the installation ship to lift and position the barrel foundation, and then gradually lower the hoisted barrel foundation so that the barrel foundation can be exhausted and drained under its own weight and sink (see Figure 5a ).

[0030] 2. After the gas inside the barrel foundation is exhausted, keep the water valve 23 open and close the air valve 32 to prevent seawater from being discharged onto the deck of the installation ship through the air pipe. Continue to lower the hoisted barrel foundation so that the barrel foundation sinks into the soil under its own weight (see Figure 5b ).

[0031] 3. After the barrel foundation is sunk by its own weight, water is pumped out to sink it. Keep the air valve 32 closed and the water valve 23 open, start the submersible pump 20 to pump water, and form a pressure difference between the inside and outside of the barrel foundation (the upper limit is the ambient water depth) to achieve sinking (see Figure 5c ).

[0032] 4. When the sinking capacity provided by the pumping and sinking system is insufficient to sink the barrel foundation to the designed depth, that is, when sinking is difficult, keep the water valve 23 open and the air valve 32 open, so that the water in the barrel foundation is connected to the water outside the barrel foundation and the gas on the water surface at the same time, and start the submersible pump 20. At this time, although the submersible pump 20 can discharge the water in the barrel foundation to the outside of the barrel foundation, the barrel foundation will not sink, but the air inlet pipe 31 and the bellows 33 will suck the gas on the water surface into the barrel foundation to fill the "cavity" formed after the water in the barrel foundation is discharged (see Figure 5d). Note that the upper limit of the amount of gas that can be introduced by starting the submersible pump 20 is the space between the lower end of the water inlet pipe 21 and the bottom surface of the barrel foundation top cover 11. At this time, the water level in the barrel foundation is flush with the lower end of the water inlet pipe 21. When the amount of gas exceeds the above upper limit, the excess gas will be discharged from the lower end of the water inlet pipe 21 together with the water to the outside of the barrel foundation.

[0033] 5. When the amount of gas introduced into the barrel foundation by pumping water and air reaches the above upper limit, close the water valve 23, stop the submersible pump 20 from pumping water, and then start the vacuum pump 30 to pump the gas introduced into the barrel foundation under the top cover 11 out of the barrel foundation (see Figure 5e ), so that the absolute pressure (air pressure) in the barrel foundation is lower than a standard atmospheric pressure (generally it can reach 80% vacuum, that is, absolute pressure -80kPa, which is equivalent to an additional 8m water depth, and can increase the sinking capacity by 50% for the sea area with an environmental water depth of 16m). The sinking capacity of the barrel foundation is increased by pumping out air, so that the barrel foundation continues to overcome the sinking resistance and sink. Note that the premise of pumping out air and sinking is that there is still gas inside the barrel foundation. As the air is pumped out and sinks, the amount of gas in the barrel foundation decreases, and the water level in the barrel foundation gradually rises, higher than the lower port of the water inlet pipe 21, and finally reaches the bottom surface of the barrel foundation top cover 11. At this time, there is almost no gas in the barrel foundation that can be further extracted, and step four (pumping water and air) needs to be repeated before pumping out air again. The maximum sinking amount that can be achieved each time by pumping out air and sinking is the height from the lower port of the water inlet pipe 21 to the bottom surface of the barrel foundation top cover 11.

[0034] 6. Repeat the above steps 4 (pumping water and air) and 5 (pumping air and sinking) to allow the bucket foundation to continue sinking until the design elevation is reached.

[0035] The barrel-based sinking equipment of the utility model is used when the vacuum sinking system is difficult to sink, and has two advantages:

[0036] 1. No need for vacuum pump to work continuously, which conforms to the working characteristics of the equipment and does not require special processing;

[0037] 2. The efficiency of vacuum pump penetration is low. Most of the penetration of the bucket foundation occurs during the self-weight penetration stage and the water pumping penetration stage, so the impact on the overall installation efficiency of the bucket foundation is limited.

[0038] The sinking equipment of the barrel foundation of the utility model adopts a combined sinking equipment of a water pumping sinking system and an air pumping sinking system, which can change the upper limit of the sinking capacity from the ambient water depth pressure (water pumping) or one standard atmospheric pressure (air pumping) to the ambient water depth pressure + one standard atmospheric pressure, thereby greatly increasing the sinking capacity of the barrel foundation in shallow waters near the coast, without the need to adopt other additional measures to assist the sinking.

[0039] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A barrel foundation sinking equipment, comprising a water pumping sinking system and an air pumping sinking system; characterized in that: The pumping and submerging system comprises a water inlet pipe, a frame, a submersible pump, a water valve and a drain pipe; the water inlet pipe is inserted into the water inlet opened on the barrel-type foundation top cover, and the lower end of the water inlet pipe is lower than the bottom surface of the barrel-type foundation top cover; the frame is installed on the barrel-type foundation top cover; the submersible pump is fixed in the frame; the outlet end of the water valve is connected to the water inlet interface of the submersible pump, and the inlet end of the water valve is connected to the water inlet end of the water pump, a sealing ring is installed on the upper part of the water inlet end of the water pump, and the lower part of the water inlet end of the water pump is inserted into the top inner cavity of the water inlet pipe, so that the sealing ring seals the top end of the water inlet pipe; the drain pipe is connected to the drainage interface of the submersible pump; The air extraction and penetration system includes an air inlet pipe, a vacuum pump, an air valve and a bellows; the air inlet pipe is inserted into the air port opened on the barrel-type foundation top cover; the vacuum pump is installed on the construction vessel; the air valve is installed on the air outlet interface of the vacuum pump; the bellows is connected between the air valve and the air inlet pipe.

2. The barrel foundation sinking equipment according to claim 1, characterized in that: The pumping and submerging system also includes a water pressure gauge installed between the outlet end of the water valve and the water inlet interface of the submersible pump, and a flow meter installed on the drainage pipe.

3. The barrel foundation sinking equipment according to claim 1, characterized in that: The air extraction and penetration system also includes an air pressure gauge installed between the air valve and the bellows.

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