JPS62147322A - Method for measuring underground vibration - Google Patents

Abstract

PURPOSE:To make it possible to measure the distribution of underground vibration, by setting a sensor at an arbitrary position in an underground depth direction by utilizing one boring hole. CONSTITUTION:A sensor capsule 2 is provided to the central part of the upper surface of a positioning jig 1, wherein the diameter thereof is determined so as to be made slightly larger than that of a boring hole A and a screw groove 7 is formed to the outer periphery thereof and a projected flange part 8 is provided to the upper edge thereof so as to be fixed thereto through a magnet 3. The projected flange part 9 internally fitted to and contacted with the projected flange part 8 is provided to the lower end of a cylinder 4 and, by pushing down the cylinder 4 under rotation in such a state that both flange parts 8, 9 are fitted and contacted, the positioning jig 1 is inserted at a required position. At the time of measurement, the cylinder 4 is slightly moved upwardly to be separated from the sensor 2 so that the vibration of the cylinder 4 is not transmitted to said sensor 2. By this method, because the positioning jig 1 inserted in the hole A is certainly fixed at an arbitrary position by the friction force with the wall surface of the hole A, vibration distribution in the hole depth direction can be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for measuring underground vibration distribution in the depth direction by using one deep hole.

(Conventional technology) When the ground shakes and ejects due to vibration sources such as earthquakes and transportation, people feel psychologically and physically uncomfortable, causing what is called a disturbance in the preservation of the human living environment. Structures and production equipment 613, etc., vibrate, although the magnitude varies depending on their rigidity, ground, and foundation structure, and cause so-called building vibration disturbances and production work disturbances, and these vibrations cause Therefore, when installing structures or production equipment on the ground, it is necessary to first measure the local environment and the ground vibrations caused by these and take appropriate measures. Therefore, several types of vibration meters are in practical use, including mechanical, optical, and electric types.

(Problem to be solved by the invention) Conventionally, when measuring underground vibrations, a method has been adopted in which a sensor is inserted and installed at the bottom of a bored hole. Since the measurements differ depending on the location, measurements were taken by boring multiple holes with different depths and inserting and installing a sensor in each hole.

Therefore, a lot of effort and time were required for the required measurements.

In other words, with the conventional method, it was impossible to measure the vibration distribution in the depth direction using a single bored hole.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for correctly placing a sensor at any position in a hole and for protecting it.

(Means for Solving the Problem) The underground vibration measurement method according to the present invention involves attaching a sensor to a positioning tool that comes into strong contact with the wall of a bored hole and stopping it due to its frictional force, and joining a long cylindrical body to this. When inserted at a desired depth, the positioning tool and the cylindrical body are separated from each other to maintain the measurement position.

(Function) In this invention, since the positioning tool inserted into the hole is reliably fixed at any position by the frictional force with the hole wall surface, the vibration distribution in the depth direction of the hole is determined by the sensor installed in the positioning tool. can be measured.

The sensor is also protected and oriented by the barrel.

(Example) Hereinafter, embodiments of the present invention will be described based on illustrative drawings.

That is, the first time shows a state where the sensor is installed in the middle of a borehole, and in the figure, 1 is a positioning tool, 2 is a sensor capsule fixed and fixed to the center of the upper surface of this positioning tool 2 via a magnet 3, etc. 4 is a long cylindrical body that serves to insert the positioning tool 1 into a predetermined position in the borehole A, protect the sensor capsule 2 by preventing earth and sand from falling on the inner wall of the borehole A, and set its direction correctly; 5.6 is positioning tool 1 and sensor capsule 2
This is a wire rope for lifting operations attached to.

By the way, the positioning tool 1 has a diameter slightly larger than that of the boring hole A, has a threaded groove 7 formed on its outer periphery, and has a protruding edge 8 on its upper edge. Also cylinder body 4
A projecting edge portion 9 is provided at the lower end to fit between the projecting edge portions 8,
The positioning tool 1 can be inserted into a desired position by rotating and pushing down the cylindrical body 4 in a state where both are fitted into each other. During measurement, in order to prevent the vibration of the cylindrical body 4 from being transmitted to the sensor, the cylindrical body 4 is moved slightly upward and separated as shown in Fig. 2, and when the positioning tool 1 is raised, that is, when the sensor is retrieved. should be pulled up simultaneously by the wire ropes 5.6, but in the embodiment shown in FIGS. 1 and 2, the cylindrical body 4 is fitted into the positioning tool 1, and the wire ropes 5.6 are pulled up simultaneously while giving a reverse rotational motion. 6 is used as an aid.

Further, in the embodiment shown in FIG. 3, a gear-shaped protrusion 10 is provided on the circumferential surface of the positioning tool 1 to increase the IY friction holding force against the boring hole A and to make it easier to push the tool.

Furthermore, in the embodiment shown in FIG. 4, a locking piece 11 made of spring steel is fixed to the bottom surface of the sensor capsule 2 and protrudes from the left and right.
Also, a joining protrusion 12 is attached to the outer periphery of the sensor capsule 2,
This short cylindrical body 14 having a protruding edge 13 that fits between the mating protrusions 12 is fixed to the bottom plate 4a of the cylindrical body 4. In other words, the sensor capsule 2 has the short cylindrical body 14 fitted thereto.
When the sensor capsule 2 is pushed downward in this state, the locking piece 11 touches the wall of the bore hole A and moves upward as shown in FIG. 5a. When the wire rope 6 is used to pull it upward, it deforms as shown in FIG. Therefore, when using this embodiment to measure vibrations in the depth direction of the hole, the sensor capsule 2 is once pushed into the bottom of the hole A and then pulled upward until the locking piece 11 is fixed as shown in FIG. The cylindrical body 4 is fixed to a wall surface in this deformed state, and the cylindrical body 4 is pulled up a small amount and separated. From now on, it is sufficient to use the wire rope 6 to pull up a predetermined amount 11 and change the successive measurement points.

Although not shown in the figure, the fitting structure of the protruding edge part 8 provided on the positioning tool l and the protruding edge part 9 provided on the cylindrical body 4 may, for example, rotate the cylindrical body 4 by a small amount in the forward and reverse directions. If a so-called locking/disengaging mechanism is provided so that the two can be reliably engaged (coupled) or detached when the two are moved, the positioning tool can be inserted and removed by operating only the cylinder body 1.
It can be pulled up and rotated, and in this case no wire rope is required. This can be similarly applied to the embodiment shown in FIG.

(Effects of the Invention) As explained above, the present invention is capable of measuring the distribution of vibration by setting a sensor at any position in the depth direction of the earth using one borehole. ,
Boring a large number of holes at different depths as in the conventional method,
The troublesome work of inserting and installing a sensor in each hole is omitted.

Furthermore, since the sensor is protected by the cylindrical body, there is no risk of damage from falling earth and sand, the correct direction of the sensor can be determined, and recovery is easy.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, FIG. 2 is a perspective view showing the relationship between the positioning tool shown in FIG. 1, the sensor, and the cylinder, and FIG. 3 is another structural example of the positioning tool. FIG. 4 is a perspective view showing another embodiment, and FIG. 5 is a front view showing its operation. Δ is a boring hole, ■ is a positioning tool, 2 is a sensor capsule, and 4 is a cylinder. Patent Applicant: Hitachi Zosen Corporation Figure 1 Figure 2 Figure 4 Bolinfudami 1 4 Hills ishif! , Tariyo ( 2 Konpu Cuff Dragon Ru 4 @ 4 heather

Claims (1)

[Claims] A sensor is attached to a positioning tool that makes strong contact with the wall of the borehole and stops due to its frictional force.A long cylindrical body is joined to this, and when inserted at a desired depth, the positioning tool and the cylindrical body are joined. An underground vibration measurement method characterized by keeping the measurement posture at a distance.