JPH0449525Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a displacement meter used to measure the displacement of bridge abutments, piers, and other structures.

Conventionally, as this type of displacement meter, those illustrated in FIGS. 1 to 2b have been used.

The device shown in FIG. 1 is constructed as follows. One end of the coil spring 2 is attached inside the upper horizontal part of the piano wire support 1, one end of the piano wire 3 is connected to the other end of the coil spring 2, and the other end of the piano wire 3 is fixed to the piano wire 3. It is fixed at a fixed point 4 near the measurement object 11 while applying a tensile force of . The coil spring 2 and the piano wire 3 are parallel to the measurement displacement direction. A recording arm 5 is placed at a predetermined position on the piano wire 3.
is fixed. A recording pen 6 is attached to the tip of the recording arm 5. By fixing the lower horizontal member of the piano wire support 1 to the measuring body 11, the displacement of the measuring body 11 in the vertical direction is captured by the tensioned piano wire 3, which is fixed to the piano wire 3. The recorded information is recorded on the recording paper 7 by the recording pen 6 of the recording arm 5.

The ones shown in FIGS. 2a to 2b are examples of displacement meters mainly used to measure the amount of subsidence of bridge abutments and piers when a train passes.

The support frame 9 is fixed at a predetermined position on the underframe 8, and the shaft 15 is passed through the upper end of the support frame 9 and the intersection of the vertical member 102 and the horizontal member 101 of the arm 10.
can be rotated in directions a and b using the shaft 15 as a fulcrum. The second horizontal member 101 of the arm 10
A heavy plow is attached to the right end in Figure a.

To measure the amount of subsidence of the abutment when a train passes, as shown in FIG. Fix one end of the piano wire 17 to the piano wire connection hole 16 provided above,
The other end is fixed to the ground near the pier with a predetermined tension applied to the piano wire 17, and the arm 10 is attached so that the horizontal member 101 is perpendicular to the bridge axis. In this case, the vertical plane including the fixing points of the arm 10 and the piano wire 17 is set to pass through the center axis of the pier.

By doing this, the vertical displacement of the abutment 11 is transmitted as a displacement in the direction a←→b centered on the axis 15 of the horizontal member 101 of the arm 10, and the displacement is displayed on the dial gauge 6'. be remembered.

However, in conventional displacement meters of this type, including those mentioned above, the bottom surface of the piano wire support 1 or underframe 8, which has a certain horizontal area, is fixed to the surface to be measured. There is no problem when installing it on a horizontal surface, but if the surface to be measured is an inclined surface, it is difficult to install the displacement meter itself, and even more so, it is difficult to install the displacement meter itself. 10 in the direction of measurement displacement is often practically impossible. For example, if it is necessary to determine the strain in the abutment 11 shown in FIG. It is necessary to measure the displacement at at least two points on the part C, but in such a case, the conventional displacement meter cannot be set at point C and measure the displacement.

The present invention has been made in order to easily solve the problems existing in such conventional displacement meters.

The present invention will be explained according to the embodiment shown in FIGS. 3 to 6. 22 is a support frame, and the support frame 22 consists of a plate-shaped horizontal member 221 and a vertical member 222 that is integrally fixed to a predetermined position of the horizontal member 221. A predetermined point of the arm 18 is pivotally attached to the upper end of the vertical member 222 via the rotation shaft 19. A piano wire joint portion 20 to which one end of the piano wire 17 is fixed is formed at the left end of the arm 18 in FIG.
In addition, a piano wire joint 20 centered around the rotation axis 19
On the lower surface of the arm 18, which is in a symmetrical position,
A detecting end of a dial gauge 25 mounted through a predetermined portion of another horizontal member 223 formed on the upper right side of the vertical member 222 in FIG. 3 is brought into contact. A piano wire connecting portion 21 is also formed on the upper surface of the arm 18 at the detection end abutting portion of the dial gauge 25. A tension spring 24 serving as a spring having a predetermined spring constant is inserted between the right end of the arm 18 in FIG. 3 and the facing surface of the horizontal member 221 facing thereto. 23 is another horizontal member 22
A stopper provided at 3 prevents the arm 18 from rotating more than a predetermined amount in the E direction.

A pair of brackets 39 and 40 are suspended below the horizontal member 221.
A shaft 29 made of a bolt is rotatably fitted into the brackets 9 and 40 in parallel with the horizontal member 221, and spacers 34 and 35 are fitted into each outer shaft 29 of the brackets 39 and 40. Another shaft 31 parallel to the shaft 29 is fitted into the lower ends of the spacers 34, 35. Nuts 37 and 38 are provided at the other end of the shaft 29 and both ends of the other shaft 31, respectively.
The shaft 29 is fitted into the brackets 39, 40 and the spacers 34, 35, and the other shaft 31 is fitted into the spacers 34, 35, respectively. As shown in FIG. 4, one bracket 39 is provided perpendicularly to the supporting frame 22 in a cross shape, and the other bracket 40 is provided perpendicularly to the supporting frame 22 in a T shape. The third axis of each of the axis 29 and the other axis 31
The lower surface of an arc-shaped interval adjustment piece 27 is fixed to the outer lower part of the spacer 34 at the left end in the figure, and an arc-shaped guide groove 271 is formed in the interval adjustment piece 27 .

On the other hand, a wing nut 36 is attached to a bracket 39 on the left end side of the horizontal member 221 in FIG. be done. axis 2
9 is fitted into the through hole of the connecting member 26 which has a circular through hole, and a predetermined outer peripheral portion of the support column 32 can be tightened with a fastening fitting 30 fixed to the connecting member 26. The shaft 31 is similarly fitted into the through hole of the connecting member 26', and a predetermined outer peripheral portion of the support column 32 can be tightened with a fastening metal fitting 33 fixed to the connecting member 26'. The support column 32 is manually adjusted to F in FIG.
Movement in the ←→G direction is possible. A screw 321 is formed at a predetermined outer periphery of the lower end of the support column 32 .

In such a configuration, the threaded portion 32 of the strut 32
1 is fixed to the surface to be measured, and one end of the piano wire 17 is connected to the piano wire joint 20 of the arm 18, for example.
The other end is fixed to a fixed point close to the object to be measured, and the horizontal member 221 of the support frame 22 and the arm 18 are set at right angles to the direction of displacement measurement, and the rotation axis 19 is the center. By measuring and recording the displacement of the arm 18 in the D←→E direction with the dial gauge 25, the vertical or horizontal displacement of the object to be measured is measured.
Unlike conventional methods, the displacement according to the present invention can be measured by simply fixing the lower end of the column 32 to the surface to be measured, so it can be measured regardless of whether the surface to be measured is a slope or any other surface. If the surface is an inclined surface, the displacement gauge can be easily mounted by cutting out the concrete at the mounting position, fixing the lower end of the support column 32 in the cutout, and filling the cutout with a fixing agent.

In addition, in this case, the support frame 22 is
The distance adjustment piece 27 can be rotated in the H←→I direction in FIG. 5 within a range determined by the interval between the guide grooves 271, and furthermore, the support column 32 can be rotated in the direction H←→I in FIG. 3 with respect to the support frame 22. Since displacement in the F←→G direction is possible, the horizontal member 221 of the support frame 22 and the arm 18 can be easily set at right angles to the displacement measuring method by using them together. In this case, use a spirit level 28 placed on the horizontal member 221 of the support frame 22 to check whether the support frame 22 is accurately in the direction of displacement measurement. , 30 and fix it in that position. The piano wire joint 21 is used when the present invention is installed on a roadbed, and displacement can be measured in the same manner as described above.

In this way, according to the present invention, the above-mentioned problems of conventional displacement meters can be effectively solved.

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing an example of a conventional displacement meter, and FIG. 2a is a front view showing another conventional displacement meter.
FIG. 2b is a side view showing an application example of the displacement meter shown in FIG. 2a, FIG. 3 is a front view showing an embodiment of the present invention, and FIG.
The figure is a plan view of FIG. 3, FIG. 5 is a left side view of FIG. 3, and FIG. 6 is a bottom view of FIG. 18... Arm, 20, 21... Piano wire joint part,
22... Support frame, 24... Tension spring (spring), 25... Dial gauge, 26, 26'...
Connection member, 27... Spacing adjustment piece, 29... Shaft, 3
1...Other shafts, 32...Support rods, 30, 33...
Fastening metal fittings, 34, 35... Spacer, 36...
Wing nut, 221... horizontal member, 222... vertical member, 271... guide groove.

Claims (1)

[Scope of utility model registration request] A predetermined part of the arm is pivotally attached to the upper end of the vertical member of the support frame which is made up of a horizontal member and a vertical member integrally, and the end of the arm on one side centered on the pivot part, and A spring having a predetermined spring constant is inserted between the opposing horizontal member and placed at the end of the other arm or at a position symmetrical to the end of the other arm around the pivot point. A piano wire joint is formed on at least one of the predetermined parts of the one arm, and a support frame at a position corresponding to the predetermined part of the one arm has a piano wire joint part formed on at least one of the predetermined parts of the one arm. A dial gauge is mounted with its detection end in contact with the lower surface, a shaft is fitted below and parallel to the horizontal member, and another shaft is mounted below the shaft in parallel with it via a spacer, A spacing adjustment piece is fixed to one of the spacers in a vertical direction outside the end face of one end of the horizontal member in the axial direction of the two shafts, and the spacing adjustment piece is fixed to the one of the horizontal members. An arcuate guide groove is formed that is movable along the shaft of a wing nut screwed onto the end, and the shaft and the other shafts each have a connecting member having a hollow portion into which each shaft is inserted. The other end of the connecting member is attached to the corresponding outer periphery of the support rod via a tightening fitting, so that the support rod can be tilted left and right with respect to a line perpendicular to the axes of the above shaft and other shafts. A displacement meter consisting of: