RU2291397C1 - Structural inclinometer - Google Patents

Abstract

FIELD: technical geodesy.

SUBSTANCE: structural inclinometer can be used for checking standard position of shaft of well at different depths, for example, at checking of slide phenomena and deformations of support walls when digging wells during under underground development. Inclinometer has centering device, float, bath, string which connects float with centering device, and measuring unit. The latter has video detector. Centering device is made of two pieces: top centering device is mounted in well for movement along string, and lower centering device is mounted at mouth of well in coaxial with axis of well. Weight of lower centering device exceeds buoyancy force of float, onto which float the measuring mark is applied.

EFFECT: improved precision of measurements; widened functional abilities.

1 dwg

Description

The invention relates to the field of engineering geodesy and can be used to control the planned position of the wellbore at various depths when monitoring, for example, landslide phenomena and deformation of retaining walls during excavation of pits during underground construction.

Known borehole inclinometer NI-2 [1] for monitoring the planned position of the trunk of a construction well at various levels, containing a sensor-inclinometer, a set of rods, a digital recorder, guides and a cable.

The disadvantage of this device is its bulkiness, the need for a 180 ° flip to eliminate sensor errors and reduce the accuracy of the calculation of the well axis with increasing depth.

In addition to low accuracy, the inclinometer is difficult to automate the measurement process.

Widely known are devices of the “reverse plumb” type, which make it possible to project a deep-laying point to the upper level [2]. The principle of the plumb line is used for executive survey of the well.

The closest to the claimed invention in terms of features (prototype) is a borehole float inclinometer containing a float with a bathtub filled with liquid, a string connecting the centralizer and the float, and a measuring device, for example, a coordinate recorder that records the position of the string relative to the well [3].

The main disadvantages of the prototype include the fact that the measurements use contact methods for reporting, which reduces the accuracy and efficiency of measurements, the measurements do not save a single base vertical, set by the lower position of the centralizer.

The problem solved by the present invention is to create a device that can exclude a person from the measurement process and thereby expand its scope and improve the accuracy of measurements.

To solve this problem, in the proposed inclinometer containing a centralizer, a bath with a float, a string connecting the float with a centralizer and a measuring device, characterized in that the centralizer is double, the upper centralizer is installed in the well with the possibility of moving along the string, the lower one is installed coaxially the axis of the well, and the weight of the lower centralizer is greater than the buoyancy of the float on which the sighting mark is placed, and the measuring device contains a video sensor.

The invention is illustrated in the drawing, which schematically shows the proposed inclinometer.

The inclinometer consists of a tripod 1, placed above the well 2, on which a bath 3 with liquid is installed. The float 4 through the string 5 is connected to the lower centralizer 6. The upper centralizer 7 with the die 8, through which the stretched string 5 is installed on the cable 9 and has a lifting device 10.

The video sensor 11 is connected to the computer 13 and is directed to the target mark 12 mounted on the float.

The device operates as follows. A tripod 1 is installed above the well 2, the bath 3 is placed above the center of the well and filled with liquid, while the float 4, under the action of the centralizer 6, lowered to the bottom of the well, pulls the string 5 (the weight of the centralizer 6 is greater than the buoyancy of the float).

Having lowered the upper centralizer 7 to the wellhead (depth 0 m), the initial reports X ₀ and Y ₀ are taken. Slowly lowering the centralizer into the well, reports X _i and Y _i are taken out every 2-3 meters.

The differences ΔX _i = X ₀ -X _i and ΔY _i = Y ₀ -Y _i characterize the displacement of the center of the well at a measured depth relative to the wellhead.

The report is taken out by a video sensor 11, consisting of a lens and an image receiver in the form of a CCD matrix, which determines the planned position of the string by the sighting mark 12 mounted on the float and transmitting it to the recording device 13.

The proposed device has the following advantages:

- the ability to measure in wells filled with water or drilling fluid;

- high measurement accuracy, independent of the depth of the well, the accuracy is determined only by the accuracy of the contact of the upper float with the well;

- the possibility of creating on its basis permanent automated control systems, for example, landslide phenomena.

Information sources

1. Dubovskoy VB et al. Borehole inclinometer NI-2, OFMG No. 3, 2003.

2. Ryazantsev G.E., Nazarov A.I., Nikitin P.A. “The use of inverted plumb lines and the results of their research when performing special geodetic works”, review, AINF 518, Central Research Institute of Atomic Information Technology, 1980

3. Guidelines for field observations of deformations of hydraulic structures and their foundations by geodetic methods, M .: Energy, 1980, p.103.

Claims (1)

A construction inclinometer comprising a centralizer, a float, a bath, a string connecting the float to the centralizer, and a measuring device, characterized in that the centralizer is double, the upper centralizer is installed in the well with the possibility of movement along the string, the lower is installed coaxially with the axis of the well, moreover, the weight of the lower centralizer is greater than the buoyancy of the float on which the sighting mark is placed, and the measuring device contains a video sensor.