7 results about "Pore water pressure" patented technology

Provided is a forming method comprising fixing an object in a mold of a forming apparatus comprising a water pressure or vapor pressure generator and the mold communicated with the water pressure or vapor pressure generator; generating water pressure or vapor pressure using the water pressure or vapor pressure generator and then injecting the water pressure or vapor pressure into the mold; and forming the object fixed in the mold using pressure generated by the water pressure or vapor pressure, and a forming apparatus used in the same. According to the present invention, it is possible to form an under-cut portion and other fine shapes which could not be formed by a conventional forming method and also it is possible to solve the problems such as the thickness variation and the whitening phenomenon after the forming process.

The invention relates to the technical field of construction monitoring. More particularly, the present invention relates to a deep foundation pit monitoring and early warning system. The system comprises a horizontal monitoring module, a soil pressure monitoring module, a pore water pressure monitoring module, an air temperature monitoring module, a humidity monitoring module, a central processing unit, a power supply module, a data comparison module, an alarm module, a signal transceiving module and a threshold setting module, wherein the horizontal monitoring module, the soil pressure monitoring module, the pore water pressure monitoring module, the air temperature monitoring module and the humidity monitoring module are connected with the central processing unit; the data comparison module is connected with the central processing unit; the alarm module is connected with the data comparison module; and the threshold setting module is connected with the data comparison module. The deep foundation pit monitoring system can monitor levelness, soil pressure, groundwater pressure, air temperature and humidity data of a deep foundation pit in real time, is high in automation degree, is very convenient and intelligent, and solves the problems that an existing manual monitoring mode is low in efficiency and large in workload of workers.

The invention discloses a device applicable to a pipe washing work of a deep sea oil and gas pipeline. The device comprises a water flushing system, a chemical agent filling system which is connected to the water flushing system, an assisting system which assists the water flushing system to clean the pipeline, and a data acquiring and transmitting system for acquiring and transmitting data of a pipe cleaning device, wherein the water flushing system comprises at least free water flushing and ROV supported water flushing; the free water flushing is that the inner and outer water pressure difference of a seawater pipeline is treated as power to flush water for cleaning the pipe; the ROV supported water flushing is that hydraulic power supplied by a centrifugal pump is used for flushing water to clean the pipe; the chemical agent filling system comprises at least an underwater chemical agent tank, a chemical agent discharging assembly, a chemical agent filling assembly, a chemical agent filtering and adjusting assembly and an underwater rapid chemical agent supplementing joint; and the chemical agent is filled with different concentration and mixing ratio through the chemical agent filling and adjusting assembly based on the flow rate change of a main pipeline. The device overcomes deep water pressure and resistance along the way and reduces the shortages of a large amount of aboveground devices for normal pipe cleaning work, large occupied space, and high input cost; and the deep water pipeline cleaning work efficiency is improved.

The invention discloses a test device and a test method for simulating soil mass column hole expansion. The test device comprises a model box, a door type bracket, a soil compacting device, a high-speed video camera, a confining pressure device and a data acquisition device, wherein the model box is of a rectangular parallelepiped structure, one short edge side surface thereof is made of a tempered glass plate, the high-speed video camera directly faces the transparent glass surface, the door type bracket is erected on two sides of the model box in the short edge direction, and the soil compacting device comprises a roller shaft assembly, a hanging cloth, a crank handle and a cover plate; and the confining pressure device is arranged on the other side corresponding to the transparent glassof the model box, and comprises an air bag, a loading plate, a partition plate and a vacuum pump; and the data acquisition device comprises a load cell, a pore water pressure gauge and an earth pressure box. The test device and the test method realize the synchronous dynamic test of the soil compacting effect, and overcome the deficiency that the prior art can only study the soil mass column holeexpansion through theoretical analysis.

The invention discloses an observation device for a microscopic flow field in a particle pore in liquidation. The observation device comprises a liquidation generation container, a water pressure monitoring system, a liquidation generation container fixing device, a dynamic pressure controller and a laser particle velocity measurement device. The liquidation generation container comprises a quartz glass sample container and a pressure transmission mechanism. A quartz glass ball and a brine sample are arranged in the quartz glass sample container. The pressure transmission mechanism is internally divided into two chambers by a rubber membrane, wherein one chamber is connected with the quartz glass sample container and the other chamber is connected with the dynamic pressure controller. The water pressure monitoring system comprises two pore water pressure gauges, wherein one pore water pressure gauge is arranged in the quartz glass sample container and the other pore water pressure gauge is arranged in the chamber connected with the dynamic pressure controller. The dynamic pressure controller injects pressure to the quartz glass ball and the brine sample arranged in the quartz glass sample container through the pressure transmission mechanism. The observation device for the mechanism research of the microscopic flow field in liquidation is provided.

The invention provides a steam change demonstration teaching aid. For the demonstration teaching aid used by schools, a concave hole capable of containing a steaming pot is formed in one side of the upper portion of a rectangular bracket, a detachable water bottle is arranged on the other side of the rectangular bracket, a passage tube for communication is arranged between the steaming pot and thewater bottle, and a bottom plate for placing a heating stove is arranged on the bracket below the steaming pot. In the teaching use process, steam can be generated by heating water in the steaming pot above the heating stove, when the steam volatilizes continuously, and the water in the stove is intermittently lowered to be lower than the water level of a bottle opening of the water bottle, underthe pressure effect of the outside air, air is squeezed into the passage tube from an opening of the passage tube and the bottle from the bottle opening of the water bottle, the air pressure and water pressure in the bottle make the water squeezed into the stove, the water bottle on the side can supplement cold water continuously, and in this way, the processes of steam generation and volatilization and cold water supplementing under the action of the air pressure and water pressure can be demonstrated for students.