RU26845U1 - PROJECTIOMETER - Google Patents

Description

The utility model relates to the field of surveying and geodetic instrumentation and is intended for the direct determination of deep displacements and deformations of both soil and rock masses and foundations of structures based on the results of profile surveying of the walls of wells drilled in the ground or laid in the structure.

The projection meter is a surveying device that defines a horizontal projection of the deviation from the vertical of a portion of a flexible thread enclosed between the source and the desired point.

There is a device for centering downhole tools containing, its body, guide rod, contact rollers, levers of equal length interconnected at an equal distance from the couplings and pairwise connected to the upper and lower sliding couplings using articulated joints located around the perimeter (A.S. USSR No. 1139836, ЕВВ 47/08, publ. 02.15.85)

The disadvantage of the analogue is that the device does not allow you to accurately center the flexible thread in the center of the well on the deformed sections of the casing in an ellipsoidal section, which leads to significant errors in the measurement of displacements and deformations in these sections.

Known Projection meter for determining the position of the desired point, shifted in height relative to the original, containing a winch, a guide roller, a stretched flexible thread, a removable vertical sensor, mounted on a flexible thread stretched between the original and the desired points, a rotary device for rotating the thread together with the vertical sensor, and rev counter for determining the length of the thread.

Projection meter

connected to the noring roller (AS USSR No. 431393, GO 1C 15/10, publ. 05.06.74).

In this device, which is closest to the proposed one and that we have chosen as a prototype, the drawback is the lack of a centering load moving along the well, which makes it impossible to determine the projection of the “sought point moving with a given measurement step along the depth of the well.

The proposed utility model solves the problem of measuring displacements along the depth of the soil mass or at different horizons of the structure, increasing the reliability of centering of the flexible string at the measuring point, and increasing the accuracy of measurement when passing deformed sections of casing in an ellipsoid section of observation wells.

To achieve this technical result, in a projection meter comprising a winch, a guide roller, a stretched flexible thread, a vertical sensor, a rotary device for rotating the flexible thread together with a vertical sensor, it further comprises a centering device with a guide rod, spring-loaded levers that are connected in pairs with two pairs upper and lower independently sliding from each other in mutually perpendicular directions of couplings for centering in ellipsoidal sections of casing using swivel joints.

In addition, the claimed technical solution has an optional feature characterizing its particular case, namely:

the centering device may have a disconnecting sleeve in the center of the guide rod for mounting any measuring device, for example, an inclinometer, reed sensors, etc. and to center it along the axis of the measuring well.

Distinctive features of the proposed utility model is that the projection meter further comprises a centering device with a guide rod, spring-loaded levers connected

in pairs with two pairs of upper and lower independently sliding couplings for centering in ellipsoidal sections of casing using swivel joints. This allows you to center the flexible thread in an ellipsoidal section of the casing in two perpendicular directions along the X and Y axis.

The proposed utility model is illustrated by the drawings presented in figL and Fig.2.

On figl shows a projection meter, General view.

Figure 2 is a schematic diagram of a centering load device for passing an ellipsoidal section of a casing.

The nano-projection meter consists of a winch 1, a rotary device 2, a flexible thread 3, a vertical sensor 4, a rack 5 with side hooks 6 for securing a projection meter, a centering weight 7, an additional load 8, a casing 9, a connecting and disconnecting sleeve 10. In the centering device 11 there are guide rod 12, upper 13 and lower 14 external shock absorbing springs, sliding upper and lower external couplings 15 for the first pair of levers 16, internal sliding couplings 17 for the second perpendicularly located pair of levers 18 and internal shock iruyuschie springs 19 and 20. At vneschnih ends of levers 16 and 18 are fixed rollers 21 contact.

Preparation of the projection meter for operation is as follows.

When measuring displacements or the inclination of the axis of the observed well, the relative position of two points lying on the axis of the well is determined. One of the points (initial) is at the intersection of the axis of the well (head) on the surface, the second point (desired) is the center of the controlled section (centering load). At the end of the casing 9 of the observed well, theodolite is taken out and the axes X and Y are fixed by risks. Then, the position of the center of the casing 9 (head) relative to these axes is determined, and fixed at the end

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equal distance from each other shoes 6 (figL). A tripod 5 is mounted on the shoes 6 and its legs are fixed in them. A winch 1 with flexible thread 3 is installed on tripod 5 and tightly fastened to it with a clamping nut. The flexible thread 3 descending from the winch 1 is thrown through the deflecting rollers and the measuring roller built into the winch 1, then attached to the centering load 7, which is lowered 1 to 2 m into the well by squeezing the levers of the upper and lower centering device And (figure 2) and center while changing the length of the legs of the tripod 5 or moving the winch 1 over the entire area of the tripod 5. After that, the rotary device 2 is locked, the levers of the centering weight 7 are unclenched along the diameter of the casing 9 and the centering weight 7 is lowered into the well to the measured point. Next, after lowering the centering load 7 to the measured point, a vertical sensor 4 of the flexible thread 3 is installed under the winch 1 while freeing the axis of rotation of the winch 1 in the rotary device 2. The projection meter is ready for operation.

To measure displacements in wells of any purpose and any curvature, an inclinometer can be mounted on the centering weight in the area of the connecting-disconnecting clutch, and when observing soil sediments, a magneto-reed sensor.

Claims (2)

1. A projection meter comprising a winch, a guide roller, a stretched flexible thread, a vertical sensor, a rotary device for rotating the flexible thread together with a vertical sensor, characterized in that it further comprises a centering device with a guide rod, spring-loaded levers connected in pairs with two pairs of upper and lower independently sliding from each other in mutually perpendicular directions of the couplings for centering in ellipsoidal sections of the casing using articulated joints. 2. The projectionometer according to claim 1, characterized in that the centering device has a connecting and disconnecting sleeve in the center of the guide rod for mounting any measuring device, for example, an inclinometer, reed sensors, and for centering it along the axis of the measuring well.