JP2001304853A - Link-type displacement meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a link-type displacement meter capable of monitoring (measuring) displacement in both horizontal and vertical directions with one unit and capable of measuring the horizontal and vertical displacement of an existing structure, the peripheral ground, and the like caused by various works, on a continuous line. SOLUTION: This link-type displacement meter is characterized by being equipped with first and second tube bodies connected to each other by means of a universal joint-like connection part, a rod-like spring material with its base end supported in an axis part in the fist tube body and with the other end put through a center piece of the connection part and supported in an axis part in the second tube body in an axially slidable manner, a small diameter part provided on a part of the spring material on the side of the second tube body, and a strain gage installed on the small diameter part. This meter is adapted in the manner that there is no need to choose between horizontal and vertical directions as its sensing direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a link type displacement meter,
In particular, connect a plurality of rails between the two ends (fixed points) of the measuring point via relay rods, and install horizontal and vertical structures such as existing structures and surrounding ground by track proximity work, pipe roof work, shield tunnel work, and retaining work. The present invention relates to a link type displacement meter capable of measuring a displacement in a direction.

[0002]

2. Description of the Related Art In civil engineering and construction works, the loosening of the ground due to excavation, the release of stress in the ground due to tunnel construction, and the tendency of deformation of the surrounding ground and adjacent structures due to other causes are inevitable. This excavation work and tunnel construction work causes loosening of the ground, reduces ground strength, and releases horizontal stress and vertical displacement due to stress release to the adjacent ground, resulting in ground subsidence and other deformation. It is conceivable that the spillover affects adjacent structures through the ground.

[0003] Protective work has been performed to prevent ground deformation caused by these causes, but it was impossible to completely eliminate the deformation. Therefore, the monitoring of the deformation of the adjacent structure is necessary in excavation work, tunnel work and the like. The measurement of this deformation is conventionally measured by "point",
That is, the displacement was mainly caused by the vertical displacement by the sinkometer and the horizontal inclination by the inclinometer, but it was difficult to grasp the overall tendency.

Therefore, the present applicant has previously disclosed a link-type displacement meter (Japanese Patent Application No. Hei 10-222) which is capable of measuring displacements of adjacent structures and the surrounding ground due to various constructions on a continuous line.
335). In this method, the horizontal displacement and the vertical displacement of the ground around the construction and the adjacent structures can be measured on a continuous line by connecting to a free length via a relay rod.

[0005]

However, the link-type displacement meter disclosed in Japanese Patent Application No. 10-222335 has a fixed portion and a sensing portion, and uses a spring band plate for the sensing portion. Was limited. Therefore, to monitor displacements in two directions, horizontal and vertical, it was necessary to shift the installation angle by 90 degrees and use two units as a set.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to independently monitor (measure) the displacements in two directions, that is, a horizontal direction and a vertical direction. Is to provide.

[0007]

In order to achieve the above object, the present invention comprises a first cylindrical body and a second cylindrical body connected through a universal joint-like connecting portion, and the first cylindrical body and the second cylindrical body are connected to each other. A bar-shaped spring material is provided, the base end of which is supported by the axial center portion, and the other end of which penetrates the center piece of the connecting portion and is axially slidably supported by the axial center portion of the second cylindrical body. A small-diameter portion is provided on a part of the rod-shaped spring material on the side of the second cylindrical body, and a strain gauge is provided on the small-diameter portion, so that a sensing direction of a horizontal or vertical direction is not selected.

Further, the invention according to claim 2 is characterized in that the small diameter portion on which the strain gauge is installed is covered with a rubber tube material, so that the strain gauge can be waterproofed without hindering the sensitivity of the small diameter portion. It was configured to be able to.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a first embodiment of the present invention. 1 is a perspective view showing the main part of the present displacement meter in a see-through manner, FIG. 2 is an exploded perspective view of a universal joint-like connecting portion, FIG. 3 is a side sectional view of the present displacement meter, and FIG. It is a schematic plan view which shows a use state.

In FIG. 1, reference numeral 1 denotes a displacement meter of the present application. The displacement meter 1 of the present application includes a first cylindrical body 3 and a second cylindrical body 4 connected via a universal joint-shaped connecting portion 2.
A base end 5 a of a rod-shaped spring material 5 is provided at an axial center portion in the first cylindrical body 3.
Are supported by the support means 6.

[0011] As shown in FIG.
Are provided with two protruding pieces 3a, 3b opposed to each other in the lateral direction, and two end pieces of the second cylindrical body 4 are provided with two protruding pieces 4a, 4b opposed in the vertical direction. And 4
The center piece 2a is positioned in a space surrounded between the two projections, and the projection 3a is inserted into pin holes provided on the left and right lateral surfaces and upper and lower surfaces of the central piece 2a. , 3b
And pins 2a 'inserted through pin holes provided in 4a and 4b,
2b 'and 2a ", 2b" are inserted into the ends to form a universal joint.

A through hole 7 through which the bar-shaped spring member 5 is inserted is provided on the axial surface of the first cylindrical body 3 and the second cylindrical body 4 of the center piece 2a. The support means 6 supporting the base end 5a of the rod-shaped spring member 5 at the axial center portion in the first cylindrical body 3 is a screw rod screwed from the outer periphery of the first cylindrical body 3 toward the axial center. 6 '. Of course, the support means 6 is not limited to the screw rod 6 '.

The other end 5b of the bar-shaped spring member 5 penetrating the center piece 2a of the connecting portion 2 is inserted into a tube member 9 supported by a support means 8 at an axial center in the second cylindrical body 4. Supported. The supporting means 8 is, similarly to the supporting means 6, a screw rod 8 'screwed from the outer periphery of the second cylindrical body 4 toward the axis.
It consists of. Here, the other end 5b of the rod-shaped spring material 5
Is supported via the pipe member 9 in order to enable sliding in the axial direction.

A small-diameter portion 10 is provided at a part of the rod-shaped spring member 5 on the second cylindrical body 4 side. The small-diameter portion 10 is arranged such that the second cylindrical body 4 is horizontally (in the direction of arrow a) about the longitudinal axis (pins 2a 'and 2b') of the connecting portion 2 with respect to the first cylindrical body 3 (fixed side). Or, when it is displaced in the vertical direction (the direction of arrow B) about the horizontal axis (pins 2a "and 2b"), it becomes a portion where the bending stress applied to the rod-shaped spring material 5 is concentrated.

A strain gauge 11 is provided on each of the vertical surface (at least one of the upper and lower surfaces) and the horizontal surface (at least one of the left and right surfaces) of the small diameter portion 10. The strain gauge 11 can be satisfied by using a commercially available one. If the strain gauge 11 is set to “0” when the bar-shaped spring member 5 is in a normal linear state (initial setting position), the second cylinder 4 is moved relative to the first cylinder 3 (fixed portion). As described above, when the rotation is made about the vertical axis and the horizontal axis, the displacement direction and the rotation angle can be electrically converted as the displacement amount.

The values obtained by the strain gauge 11 are accumulated, graphed and stored via a computer (not shown). It is also possible to print out by operating a printer (not shown). Furthermore, it is also possible to display the accumulated value in real time on a monitoring monitor (not shown) at the construction site or to transmit the accumulated value as an information signal to a signal base such as a railway.

The small diameter portion 10 on which the strain gauge 11 is installed is covered with a rubber tube 12. The rubber tube member 12 not only hinders the sensitivity of the small diameter portion 10 of the rod-shaped spring material 5 but also stably supports the strain gauge 11 on the small diameter portion, and also functions effectively in waterproofing the strain gauge 11. The rubber tube 12 can be changed to a material having deformability (elasticity).

In the drawing, R is a relay rod, which is fitted so as to cover the outer ends of the first cylindrical body 3 and the second cylindrical body 4, and has an outer periphery of the fitting portion R '. Thus, the screw rod R ″ can be fixed by screwing the screw rod R ″ into the first cylindrical body 3 and the second cylindrical body 4.

Next, the operation of the present displacement meter 1 will be described with reference to FIG. First, fixed points A and B of a trajectory (not shown) in which ground deformation is predicted due to ground loosening or the like due to excavation work near a railway track. Then, a plurality of displacement gauges 1 of the present invention are connected and installed between the fixed points A and B via a relay rod R. Then, the outer periphery of the first cylindrical body 3 between the fixed points A and B is loosely fixed to a plurality of (only one is shown in the figure) support members K provided on a track or a pile installed near the track. I do.

When the ground changes between the fixed points A and B, the change is caused by the change of the second cylinder 4 with respect to the fixed portion (first cylinder 3) of the displacement meter 1 of the present application. Is rotated about the connecting portion 2, the rod-shaped spring member 5 is also bent in the direction of the rotation, and the dents concentrate on the small-diameter portion 10.

The strain concentrated on the small-diameter portion 10 is sensed by the strain gauge 11 to measure whether the movement is horizontal or vertical, and the displacement is electrically converted and accumulated in a computer. And stored. In addition, the information can be displayed on a construction site monitoring monitor in real time, or can be transmitted as a warning signal to a train approaching the measurement point.

[0022]

As described above, the present invention comprises a first cylindrical body and a second cylindrical body connected via a universal joint-like connecting portion, and the base end of the first cylindrical body is located at the axial center. Supported,
The other end penetrates the center piece of the connecting portion, and a rod-shaped spring material is provided at the axial center portion of the second cylinder so as to be slidable in the axial direction. Since a small diameter portion is provided in part and a strain gauge is installed in the small diameter portion, the sensing direction is not selected, and only a plurality of connections are made via the relay rod R, and even in the horizontal direction, the vertical direction can be changed even in the horizontal direction. This has an excellent effect that it can cope with fluctuations.

Further, the invention according to claim 2 is characterized in that a rubber tube is covered on the small diameter portion where the strain gauge is installed, so that the sensitivity of the small diameter portion of the rod-shaped spring material is not hindered. Can be stably supported, and the waterproof effect can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a displacement meter of the present application in a see-through manner.

FIG. 2 is an exploded perspective view of a universal joint-shaped connecting portion.

FIG. 3 is a side sectional view of the present displacement meter.

FIG. 4 is a schematic plan view showing a use state of the present displacement meter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Displacement meter 2 Connection part 2a Center piece 2a ', 2b' Pin (vertical axis) 2a ", 2b" Pin (horizontal axis) 3 First cylindrical body 3a, 3b Projection piece of first cylindrical body 4 Second cylindrical body 4a, 4b Projection piece of second cylindrical body 5 Rod spring material 5a Base end of rod spring material 5b Other end of rod spring material 6 Support means 6 'Screw rod 7 Through hole 8 Support means 8' Screw rod 9 Tube member 10 Small diameter Part 11 Gage gauge 12 Rubber tube material A, B Fixed point K Support member R Relay rod R 'Fitting part R "Screw rod

Continuation of the front page (72) Inventor Yasuhiro Exit 1-10-8, Tanihara, Nerima-ku, Tokyo F-term (reference) 2F069 AA06 BB40 DD13 GG06 HH30

Claims (2)

[Claims] A first cylindrical body and a second cylindrical body connected via a universal joint-shaped connecting portion, a base end of which is supported by an axial center portion of the first cylindrical body, and the other end of which is connected to the first cylindrical body. A rod-shaped spring material is provided at the axial center portion of the second cylindrical body through the center piece of the portion and slidably supported in the axial direction, and a small-diameter portion is provided on a part of the rod-shaped spring material on the second cylindrical body side. And a strain gauge is provided on the small diameter portion. 2. A small-diameter portion on which the strain gauge is installed,
The link type displacement meter according to claim 1, wherein a rubber tube is covered.