JPS5824731Y2 - Survey board - Google Patents

Description

[Detailed explanation of the idea] This idea concerns a survey board.

More specifically, it relates to a surveying board for measuring the center and level of the axis of a small diameter pipe laid underground in the small diameter pipe propulsion method and horizontal auger method.

In the case of small-diameter pipes laid underground, it is often impossible for people to enter the pipe, and even if they can, it is difficult to enter with surveying tools.

Therefore, in the past, there was no method for measuring the center or level of the pipe axis for such small diameter pipes.

This idea is intended to provide a surveying board that makes such surveying possible.

This idea involves running a trolley remotely inside a small-diameter pipe, attaching a target to the trolley, ensuring that the center of the target always points to the center of the pipe, and measuring the center of the target using a transit device from the starting port. It is based on the idea of measuring the center or level.

This idea uses two radially protruding corners to ensure that the center of the target always points to the center of the tube.
The principle that if the length of the corner of a book is equal to the inner radius of the tube and the tip of the corner is in contact with the inner surface of the tube, the intersection of the two corners will always be located at the center of the tube. It is something to be used.

In other words, this idea has two corners protrude radially from the target parallel to the plane of the target, the distance from the intersection of the corners to the tip of the corner is equal to the inner radius of the tube to be surveyed, and the angles are attached to the target. A mark indicating the intersection of is attached to make a corner target, and the corner target is attached to the center of the trolley, keeping the two corners perpendicular to the running axis of the trolley.
This relates to a surveying board that can be moved vertically and horizontally and is biased upward by a spring.

This invention will be explained with reference to the drawings as follows.

Figure 1 is a front view of the survey board placed inside the pipe, and the second
The figure is a rear view of the same, and FIG. 3 is a partially cutaway side view.

FIGS. 4 and 5 are enlarged cross-sectional views taken along lines IV-IV and -■ in FIG. 2, respectively.

In Figures 1 to 5, the survey board of this invention is placed in a pipe 1 installed underground.

The survey board of this invention consists of a square target attached to a cart 9.

Among these, the squared target has two corners 4 protruding from the target 3 in parallel with the plane of the target 3 and radially.

Specifically, the front side of the target 3 is marked with a concentric scale 2, and two corners 4 extending parallel to the plane of the target 3 are made to protrude radially. The intersection point coincides with the center position of scale 2.

A roller 16 is attached to the tips of the two corners,
The roller 16 constitutes a part of the corner, and the length from the tip of the roller 16 to the intersection of the corners is equal to the radius of the tube.

The manner in which the square target is attached to the trolley 9 is shown in FIG.

Two guide posts 8 are fixed on the trolley 9 so as to face each other on the left and right sides.

A bracket 6 is fitted between the guide posts 8 so that the bracket 6 can slide up and down along the guide posts 8.

Furthermore, the bracket 6 is urged by a spring 7 to protrude upward.

A shaft 5 is attached to the bracket 6 so as to be able to slide left and right, the above-mentioned cornered target is fixed to the shaft 5, and the plane including the two corners 4 is perpendicular to the traveling axis of the truck, that is, substantially to the tube axis. oriented perpendicular to.

Therefore, the two corners 4 are always in a plane perpendicular to the running axis of the truck and can be pressed against the tending spring 7.

The manner in which the shaft 5 is attached to the bracket 6 is shown in FIGS. 4 and 5.

A pair of upper and lower guides 61 are fixed to the bracket 6, a slide plate 51 is fitted into the guide 61, and the slide plate 51 is fixed to the shaft 5.

Therefore, the shaft 5 can be moved vertically by the guide post 8 and the bracket 6, and can be moved laterally by the guide 61 and the slide plate 51, so that the shaft 5 can be moved vertically and laterally together with the target 3. It becomes.

The truck 9 has wheels 10, sprockets 11. gear tomo
The vehicle is equipped with a motor 12 and a cabtyre cable 13, and can be operated within the pipe by remote control from the starting port.

Along with this travel, the target 3 advances inside the pipe.

In this survey board, the center of the target 3 is always located at the center of the pipe no matter where the cart is located within the pipe.

The reason is as follows.

First, the two corners 4 are urged upward by the spring 7 and protrude, and can be moved vertically and horizontally, so as long as the cart 9 is inside the pipe, the tips of the two corners 4 will be on the inner surface of the pipe 1. will come into contact with.

Furthermore, the corner 4 always remains in a plane perpendicular to the running axis of the truck, so that it always extends in the radial direction of the tube.

Moreover, since the intersection of the corners 4 is located at a location equal to the radius of the tube from the tip of the corner 4, the intersection of the corners 4 is always located at the center of the tube.

The intersection of the corners 4 thus coincides with the center of the target 3, but the center of the target 3 will always be located at the center of the tube.

Moreover, according to the survey board of this invention, even if there is dirt falling inside the pipe, the center position of the pipe can be determined without error.

This is because the squared target is mounted on a trolley and can be moved vertically and horizontally, so the two
The center position is always determined by the corner of the book coming into contact with the inner wall of the pipe, and in this relationship, even if the left wheel of the cart rides on the sand and the cart is tilted to the side due to falling dirt, it will not be affected. This is because it is not done.

With conventional survey vehicles, the wheels must be in contact with the inner surface of the pipe, making them unusable in pipes with spilled earth and sand.

Of course, dirt may get under the wheels of the trolley, tilting the surface of the trolley in the front-back direction, which may cause errors, but these errors can be ignored by making the wheel base large relative to the height of the target. It can be made possible.

This is because for small diameter pipes, the wheelbase of the cart can be made larger than the inner diameter of the pipe.

Therefore, when looking in the direction of the pipe's fabric plan with the transit, within the field of view of the transit, the vertical line 1 of the crosshair
4 and the horizontal line 15 as shown in Figure 1, the position of the tube at that time is 30 mm above the planned position from the tangent between the crosshair line 14. It can be seen that it is deviated 20mm to the left.

In order to make it easier to see, it is preferable that the scale plate of the target 3 is made of a translucent plastic plate and that the scale plate is illuminated from the back side with a miniature light bulb.

In addition, various methods can be adopted for illuminating the scale plate.

The running axis of the truck is the direction in which the truck 9 moves, that is, the center line of a plane connecting the tips of the wheels 10 of the truck 9, and when the truck 9 is placed inside the pipe, it is parallel to the central axis of the pipe. It is a line.

In order to attach the square target on the cart, various methods can be used, not limited to the illustrated example.

Further, the rollers 16 are installed to reduce resistance when the survey board moves forward and backward, and are not necessarily required.

Furthermore, a weight 17 is attached below the target 3 to serve as a counterweight to prevent the two corners from pointing downward.

By using the surveying board according to this invention, it is possible to run the surveying board into a pipe with a small diameter where no one can enter, determine the center of the pipe at a necessary location, and thereby determine the level of the pipe.

In this respect, the survey board of this invention has great practical value.

[Brief explanation of drawings]

FIG. 1 is a front view of the survey board placed in the pipe, FIG. 2 is a rear view of the same, and FIG. 3 is a side view of the same. In addition, FIG. 4 and FIG. 5 are respectively IV-I in FIG.
It is an enlarged cross-sectional view taken along the V line and the v-■ line. In the figure, 1 is the tube, 2 is the scale, 3 is the target, and 4
is a corner, 5 is a shaft, 6 is a bracket, 7 is a spring, 8 is a guide post, 9 is a truck, 10 is a wheel, 11 is a sprocket, 12 is a geared motor, 13 is a cabtyre cable, 14.15 is a crosshair 16 is a roller, and 17 is a weight.

Claims (1)

[Scope of utility model registration request] Make the two corners project radially from the target parallel to the plane of the target, make the distance from the intersection of the corners to the tip of the corner equal to the inner radius of the tube to be surveyed, and place a mark on the target indicating the intersection of the corners. The squared target is attached to a trolley, and the two corners are kept perpendicular to the running axis of the trolley, making it possible to move vertically and laterally, and with a spring to move upward. A surveying board that is energized.