Device for metering pressure

FIELD: engineering investigations in building, particularly devices for determining deformation and strength properties of ground in well.

SUBSTANCE: device comprises probe (working tip), control-rod, pipeline, communication line, loading jig and measuring station. Probe includes hollow cylindrical body with bottom and cap filled with working liquid, elastic shell sealed from body bottom and top. Formed in non-fixed elastic shell area are perforations. Piston with rod is installed in upper part of hollow body above working liquid. Rod passes through cap in sealed manner. Rod is connected with control rod so that piston may move in axial direction. Formed above piston is cavity connected to pipeline. Hollow body has bottom in which air-tight plug is installed. Measuring device is made as linear piston displacement transducer. Through orifices are formed in hollow body wall near body bottom. Arranged from body outside are vertical or inclined grooves aligned with through orifices by lower ends thereof. Air-tight plug is provided with adjustable rest for restricting piston stroke.

EFFECT: simplified structure of probe and measuring devices, increased operational reliability and improved validity of obtained data.

2 cl, 1 dwg

 

The invention relates to engineering surveys in construction, namely, devices for determining deformability and strength of the soil in the hole.

Known pressione [1], containing pessimistically probe, pipeline, loading and measuring system, and the probe includes a cylindrical housing for the working fluid with a perforated side surface and a flexible membrane sealed on the side of the case.

A disadvantage of the known solutions lies in the complexity of manufacture and Assembly associated with the presence of a compound of clips from hard spring-loaded plates.

A device for pessimistically soil tests [2], which contains devices for delivery of the working body at the point of testing, and load equipment and communication channels, and the working body (pessimistically probe) includes a cylindrical housing with grooves, with tightly secured on the elastic sheath and placed between the working fluid and measuring devices.

A disadvantage of the known solution is of low value in the point, random measurements. This is especially true for testing heterogeneous, layered (layer cake) and saturated soils.

Known also pressione [3], which is what I technical essence and the total number of essential features of the prototype of the present invention. Prisioner contains pessimistically probe pipeline, measuring and loading system and the communication channel. The probe includes a hollow cylindrical casing filled with working fluid, means for measuring the liquid level, an elastic membrane, sealed on the side of the case having a through hole at the top and bottom.

A disadvantage of the known solution is the bulkiness of the probe and a low informative conducted its testing, due to the complex design of the measuring and load equipment.

The technical task of the invention is to simplify the design of the probe and measuring devices, reducing the size and increasing the information content from the received test data by providing certainty in the interpretation of these data.

The problem is solved by the fact that prisioner containing pessimistically probe, pipeline, loading system, channel, rod and the measuring device, and the probe includes a hollow cylindrical body with a bottom and a top, filled with the working fluid, elastic shell, sealed on the side of the case with education between the shell and the body of the volume, connected via through holes in the housing wall, izmeritelnaya device connected through a communication channel with the measuring station, according to the invention, in the upper part of the body cavity above the working fluid has a piston rod connected to the upper end of thrust, with the possibility of axial movement of the piston and the displacement of working fluid, the elastic membrane, and formed above the piston cavity, connected to the pipeline, and in the bottom of the hollow body has a sealed tube, and the fixture can be made in the form of sensor linear displacement of the piston. Through holes in the side wall of the hollow body is formed uniformly near its bottom, and outside, on the side wall of the housing under the elastic membrane is formed by vertical or inclined grooves, the bottom of each of which is associated with a corresponding through hole, and the upper joint circular groove on the hollow body, and the hermetic sealing of the tube is supplied from the camera adjustable stop limiting the stroke of the piston.

The proposed implementation presbiopicheskogo probe can significantly simplify the manufacture, Assembly and disassembly of the probe to reduce its height and weight, and also to simplify the measurement and interpretation of the obtained test results.

Indeed, knowing the area of the piston and the magnitude of its displacement from a specified area above the piston pressure is easily determined by the volume of liquid, the expulsion of the military under the elastic membrane. Knowing the area of the working part of the elastic membrane (marginal effects enter the known correction factors) and the volume of the working fluid under the shell is uniquely determined by the averaged (integrated) value of soil sediment under elastic shell in all directions regardless of the type and condition of the section of the test soil, what is the solution of a technical problem.

Because the point of the test soil (depth) and their number is determined based on the type and condition of sections of soil in the borehole during drilling, the probe before testing provides the ability to limit the stroke of the piston due to the adjustable stop in a sealed tube and, consequently, limiting expansion of the elastic shell. This ensures both the integrity of the shell, and the opportunity not to break the soil testing in a wide range of its strength and deformation properties. If necessary for weak soils can be used probes with increased stroke and high elasticity of the shell.

The drawing schematically shows a General view of the proposed presbiopicheskogo probe.

The probe includes a hollow cylindrical housing 1 filled with the working liquid 2, the elastic membrane 3, sealed top and bottom of the housing 1, provided with through holes is 4 and vertical (inclined) grooves 5 on its outer surface. The probe has also bottom part 6 and Golovnin 7. In the upper part of the housing 1 above the working liquid 2 posted by the piston 8, provided with a stem 9, which passed with a seal through Golovnin 7 and connected to the thrust (conventionally not shown). Above the piston 8 is formed cavity 10, connected to the pipe 11, and the bottom 6 of the casing is hermetically installed tube 12 with an adjustable stop 13. The measuring device 14 (interacting with the rod 9) are connected by a communication channel 15 to the measuring station (not shown).

The probe has also technological connectors, seals, window ugolovnika 7, and the fastening elements on the drawing is not marked.

Prisioner works as follows: before working piston 8 is installed in the upper position, and then pessimistically probe is turned so that the tube 12 and he looked up. After unscrewing the tube 12 of the bottom part 6 into the hole fill the working fluid 2 and filling the casing 1 by the working fluid while release from the cavity air (which is also facilitated grooves 5 and 4 holes). After filling the casing with fluid, set in the desired position, the stop 13 and screw up hermeticum tube 12 in the bottom. After that, the probe is turned into position, using a pipe 11 connected it to a load device (the grade is at or compressor), while the measuring device 14 through the communication line 15 is connected to the measuring station.

The probe by means of traction (or pipe string or rope) is lowered into the well to a point test, create a first compression of the ground by means of an elastic membrane and applying a small initial pressure in the cavity 10 above the piston 8 through the compressor or gas cylinder. Then after pressing the elastic membrane 3 to the ground give the first stage of pressure on the ground and after stabilization of the compression of the walls of the soil in the hole under the action of the first stage pressure determine the amount of radial deformation of the soil under the elastic sheath 3 on the modified magnitude of the axial movement of the piston 8 and the known ratio of the areas of the piston and the shell and then process the results by well-known methods. At the end of the first stage of the load is transferred to the subsequent steps according to a given program (until the destruction of the soil, if it is included in the program).

Upon completion of testing of the soil at a predetermined depth of the air from the pipe 11 release, with traction return the piston 8 in the original upper position, the working fluid flows from the elastic membrane in the hollow probe housing, and an elastic sheath firmly pressed against the side surface of the housing 1. After that, the probe is moved to a new set deep into the well and produce tests in the same order.

According to the drawings of the applicant was made of the proposed probe and tested according to the described method on construction sites in Moscow region.

If necessary, the examination may be sent to the acts of the test device.

Thus, the invention meets the criteria of the technical solution and its industrial applicability.

SOURCES of INFORMATION

1. USSR author's certificate No. 1094898, MCL E 02 D 1/00, 1982.

2. USSR author's certificate No. 567993, MCL E 02 D 1/00, 1977.

3. USSR author's certificate No. 221364, MCL G 01 D 3/10, 1966 (Prototype).

1. Prisioner containing pessimistically probe, tubing, load the system, traction and measuring device, and pessimistically probe includes a hollow cylindrical housing, a fluid-filled elastic shell, sealed top and bottom of the hollow body, having a through hole in the area of the loose section of the shell, characterized in that the upper part of the housing cavity has a piston rod connected to the thrust, with the possibility of axial movement of the piston and the displacement of fluid under elastic membrane, and formed above the piston cavity, connected to the pipeline, and in the bottom of the hollow body has a sealed tube, with the measuring device made the form of the sensor linear displacement of the piston.

2. Prisioner according to claim 1, characterized in that the through hole on the side wall of the housing is formed near its bottom, and outside on the side wall of the housing under the elastic membrane is formed by vertical or inclined grooves, the bottom of each of which is associated with a corresponding through hole, and a sealed tube equipped with a hand camera, removable stops, limiting the stroke of the piston.



 

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