JPH0435765Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial field of application>> This invention relates to a support device for a roller for a hole bending measuring device, and in particular to a supporting device that allows a hole bending measuring device to follow the deviation of an excavated hole with high precision. .

《Conventional technology》 Normally, holes drilled with a boring machine etc.
It does not have perfect straightness and curves in any direction, and horizontal boreholes in particular tend to tilt downward due to the gravity acting on the boring machine.

By the way, in relatively small-diameter excavated holes such as advanced pilot holes in oil fields, wells, and tunnels, for example, in advanced pilot holes, the curvature of the pilot hole must be measured in order to accurately determine the positional relationship with the main shaft.

For this reason, conventionally, a measurement tube was used, which was made by connecting two cylinders containing a laser oscillator and a television camera with a flexible member, and this was inserted into the excavation hole, and the measurement tube was inserted into the borehole, and A measuring device was used that used a laser beam and a television camera to detect the difference in inclination angle between the cylinders.

However, this type of measuring device performs measurements while sequentially moving inside the borehole.
The movement was done in an inchworm-like manner so that the optical axis from the previous measurement was used as the reference optical axis for the next measurement, but there was a problem with the initial settings.

Therefore, the present applicant has developed a hole curvature measuring device that can be easily initialized, and has already proposed it in Japanese Patent Application No. 18832-1983.

As schematically shown in FIG. 3, the measuring device according to this application connects a pair of hollow cylindrical measuring tubes 1 and 2 in a swingable manner with a ball joint 3, and inserts a pair of hollow cylindrical measuring tubes 1 and 2 into the measuring tube 1 at the front. In addition to providing a CCD target 4, a bidirectional laser emitter 5 is installed in the rear measuring tube 2, and hole bending is detected from the deviation of the position where the forward beam _S1 of the laser emitter 5 irradiates the target 4. In addition, the backward light beam S ₂ is received by the screen 6 to initialize the measurement tube 2 .

However, according to subsequent studies by the inventors of the present invention, the device of the above application also had the following problems.

<<Problem to be solved by the invention>> That is, in the device of the above application, as also shown in FIG. Rollers 9, 10, and 11 were provided at three locations on the measurement tubes 1 and 2 and were run.

In this case, if twisting occurs when installing it on the rail 8, since the measurement tubes 1 and 2 are connected by the ball joint 3, the roller 9 provided at one location in front of the measurement tube 1 It can rotate due to its own weight and follow the twisting of the rail 8.

However, the rear measurement tube 2 is placed on the rail 8 at four locations by a pair of rollers 10 and 11, and even if the rail 8 is twisted, it is supported by the three rollers. However, there was a problem in that the rollers in any one position were lifted up, and the measuring tube 2 could not sufficiently follow the twisting of the rail 8, resulting in a decrease in the accuracy of the hole bending measuring device.

This invention was made in view of the above problems, and the object is to provide a support device for a roller for a hole bending measuring device that can easily and reliably follow the intended torsion of the rail.

<Means for Solving the Problems> In order to achieve the above object, this invention includes a pair of measurement pipes that are swingably connected and run on a rail provided in an excavation hole, and a The device is equipped with a built-in optical system measuring unit and supports rollers for a hole bending measuring device that detects deviation of the optical system corresponding to hole bending, and a pair of rollers rolling on the rails. It consists of an outer cylinder which is rotatably fixed, and a slidable inner cylinder which is fitted concentrically inside this outer cylinder and attached to either one of the measurement tubes.

<Operation> According to the support device configured as described above, the rollers rolling on the rail are fixed to the outer cylinder fitted with the sliding inner cylinder attached to the measurement tube, so that twisting of the rail is prevented. Even if it gets hot, the outer cylinder can rotate relative to the measurement tube and follow the twisting of the rail.

<<Examples>> Hereinafter, preferred embodiments of this invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of a roller supporting device for a hole bending measuring device according to this invention.

The support device shown in FIG. 3 is used to support the roller 10 disposed close to the connecting portion of the measurement tubes of the hole bending measuring device shown in FIG. 3.

The configuration of the hole bending measuring device itself is the same as that of the above-mentioned patent application device, so parts corresponding to those in FIG. 3 are denoted by the same reference numerals, and explanations of the measuring unit of the optical system and the like will be omitted.

The support device shown in the figure has a pair of rollers 10 that roll on rails 8 installed in a casing inserted into an excavation hole, either self-propelled or by a drag such as a wire, between an outer cylinder 14 and an inner cylinder. It is supported by 16.

In this embodiment, as shown in FIG.
1a so that the tip of the rail 8 comes into contact with this V-groove 101a, and the other roller 102 is formed quite wide so that the rollers 101, 1
02 is designed to prevent it from coming off the rail 8.

The rotating shaft 17 of each roller 101, 102 is inserted into mounting holes 14a, 14b formed oppositely at positions offset downward from the axis of the outer cylinder 14.
It is fixed by welding to the outer surface of the

The outer cylinder 14 and the inner cylinder 16 are each formed by halving members in the axial direction and joining them with bolts 18 to form a hollow cylinder. The cylinders 14 and 16 are arranged to fit concentrically toward each other, and these cylinders 14 and 16 are fixed to each other.

Further, the outer cylinder 14 is made of a metal material such as stainless steel, and the inner cylinder 16 is made of nylon, fluorine resin, or the like, which has sliding properties and has a small coefficient of friction.

The support device is attached to the measurement tubes 1 and 2 in the following manner.

FIG. 2 shows a half-sectional view of the connecting portion of the measurement tubes 1 and 2. In this example, a small-diameter step 2a is formed at the tip of the rear measurement tube 2, and this step 2a is formed at the tip of the rear measurement tube 2.
A ball joint 3 is installed between the outer cylinder a and the inner periphery of the rear end of the front measuring tube 1.

Then, behind ball joint 3, first,
After applying the half-split inner cylinder 16 from the side and joining with the bolts 18, the half-split outer cylinder 14 is applied to the outer periphery of the inner cylinder 16 from above and below and similarly connected with the bolts 18 to install. is completed.

Note that the roller 10 may be fixed to the outer cylinder 14 in advance, or may be attached after the outer cylinder 14 is attached.

When the support device is installed, a slight gap is created between the measurement tubes 1 and 2.

In the support device configured as above,
For example, in the state shown in FIG. 3a, rollers 10 and 11
Even if the rail 8 is twisted between the
0 rotates while sliding along the outer periphery of the stepped portion 2a of the measuring tube 2.

Therefore, the roller 10 reliably contacts the tip of the rail 8 and supports the measurement tube 2 on the rail 8 at all times at four points.

As a result, roller 1 due to twisting of rail 8
0 and 11 are prevented from rising, and the measurement tube 2 is made to accurately follow the curve of the rail 8.

In the above embodiment, the support device of the present invention is applied to the roller 10 provided near the connecting portion of the measurement tubes 1 and 2, but it may also be applied to the roller 11 on the rear end side of the measurement tube 2. The same effect can be obtained.

Further, in the above embodiment, the outer cylinder 14 and the inner cylinder 16 are fixed, and the inner cylinder 16 is rotatable around the outer circumference of the stepped portion 2a of the measurement tube 2, but the inner cylinder 16 and the stepped portion 2a are may be fixed, and the outer cylinder 14 may be rotated by the inner cylinder 16.

<<Effects of the invention>> As explained in detail in the embodiments above, according to the roller support device for a hole bending measuring device according to this invention, the measuring tube can faithfully follow the deformation of the rail. , improve the accuracy of hole bending measurements.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the device of the present invention, FIG. 2 is a cross-sectional view of the device in an installed state, and FIG. 3 is an explanatory diagram of the hole bending measuring device. 10, 11...roller, 14...outer cylinder, 16...
...Inner cylinder.

Claims (1)

[Scope of utility model registration request] a pair of hollow cylindrical measurement tubes that are swingably connected and run on rails provided in the excavation hole;
The measuring device is equipped with a measuring unit of an optical system built into the measuring tube, and supports a roller for a measuring device that detects a deviation of the optical system corresponding to hole bending,
An outer cylinder rotatably fixed to a pair of rollers rolling on the rail, and a sliding inner cylinder fitted concentrically inside the outer cylinder and attached to one of the measurement tubes. 1. A support device for a roller for a hole bending measuring device, characterized by comprising a cylinder.