JP3538461B2 - Settlement measuring device for underground pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the displacement of an underground pipe such as a gas pipe or a water pipe buried underground.

[0002]

2. Description of the Related Art Underground buried pipes are subject to sedimentation and lateral displacement in the soil at the buried site when there is an earthquake, vibration caused by vehicle passage, depletion of groundwater, or the effect of civil engineering work. Buried pipes may be damaged. In particular, cracks in conduits can lead to serious accidents such as gas and water stoppages, gas fire accidents, and submerged roads. In order to prevent such damage in advance, measure the buried position of the buried pipe at predetermined intervals, accurately grasp the buried position of the buried pipe, and if a certain amount of settlement or lateral displacement occurs It is necessary to reinforce the soil near the buried pipe, renew the pipe, and refill it.

For this purpose, an apparatus for measuring settlement of underground pipes as shown in FIGS. 10 and 11 has conventionally been used.
10 and 11 are a longitudinal sectional view and a transverse sectional view, respectively, of an apparatus for measuring the settlement of an underground pipe. The apparatus for measuring the settlement of an underground pipe is shown in FIG.
0, a block base 18 and a concrete block 17 are placed thereon, and a road surface indicator 16 having a lid on the concrete block 17 so that an upper end thereof is flush with the ground surface.
And the half ring 5 and the half ring 6 are fixed around the conduit 1 with bolts via a rubber sheet 9 for protecting the conduit 1 from being damaged. And the upper end of the detection rod 3 is placed in the road surface indicator 16. The protection cylinder 11 is a cylinder installed around the detection rod 3 to protect the detection rod 3 and is buried and held in soil.

In such an apparatus for measuring settlement of an underground buried pipe, the lid of the road surface indicator 16 is opened, the tip of a staff is applied to the tip of the detection rod 3, and the level is measured with reference to a benchmark. It is possible to determine whether or not the conduit 1 is sinking, and if so, how much.

[0005]

However, in the above-mentioned prior art, the amount of subsidence of the conduit 1 in the vertical direction can be easily measured. However, for the movement in the horizontal direction, computer simulation or the like is used from the obtained data. do it,
Although some predictions can be made, the conduit 1
In order to grasp the horizontal movement of the device, appropriate computer equipment etc. are required and it takes time,
In addition, accurate measurement was not possible.

Therefore, it is impossible to easily measure the horizontal movement of the conduit 1 on site by the conventional technique, and the conduit 1 is subject to earthquakes, vibrations caused by passing vehicles, depletion of groundwater, and civil engineering work. Horizontal force acts due to the influence, etc.
Even if the conduit 1 is moving in the axial direction or the direction perpendicular to the axial direction, such a situation is overlooked, which is dangerous.

According to the present invention, the amount of movement in the vertical direction as well as the amount of movement in the vertical direction with respect to such a conduit 1 is simply measured on site, and the amount of movement and the direction of movement of the conduit 1 in the ground are determined in that direction. Regardless, it is intended to measure accurately.

[0008]

In order to solve the above problems, the present invention extends a detection rod from an underground pipe to the surface of a ground,
In an underground buried pipe subsidence measuring device that measures the amount of movement of the underground buried pipe from the surface by sinking and moving the soil around the underground buried pipe based on the amount of movement of the detection rod, the underground buried pipe and the detection rod are connected by a universal joint. And, the amount and direction of movement of the underground buried pipe are measured by the inclination of the detection rod by supporting the upper end of the detection rod with a spherical bearing so as to be tiltable and supporting the spherical bearing vertically. A tilt angle sensor and an insertion bar provided on the lower surface of the tilt angle sensor and inserted into the upper end of the detection rod to fix the tilt angle sensor to the tip of the detection rod. Is the insertion rod
An inclination detection device guide with a guide hole
And the spherical bearing is positioned outside the inclination detecting device guide.
It is characterized by being fixed to the circumference . Also before
In the apparatus for measuring settlement of underground buried pipes described above,
At the top of the device guide, a cap that can be attached or detached when not measuring
Is mounted.

[0009]

According to the present invention having the above structure, as apparent from the operation explanatory diagram shown in FIG. 1, the amount S of the lateral movement of the conduit 1, which is an underground pipe, is determined by the inclination angle of the detection rod 3. α can be measured and S = L · tanα can be obtained from a function of the inclination angle α and the length L of the detection rod 3. The amount of movement in the vertical direction is small because the inclination of the detection rod 3 is small. Similar to the technique, it can be easily measured from the ground surface by the amount of settlement D in the direction perpendicular to the detection rod 3. As a result, the buried position of the buried pipe can be accurately grasped.

When an inclination detecting device configured to fix an inclination angle sensor to the tip of the detection rod 3 for detecting the inclination of the detection rod 3 is provided , the upper end of the detection rod 3 is provided with an inclination.
Inclined with a guide hole into which the insertion rod of the detection device is inserted
Attaching the detection device guide
The spherical bearing was fixed. During non-measurement, tilt detection
Attach a removable cap to the upper end of the device guide and tilt it.
The guide hole of the tilt detection device is covered.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a longitudinal sectional view showing a part of the apparatus for measuring settlement of an underground pipe of the present invention, and FIG. 3 is a transverse sectional view.
In this apparatus for measuring settlement of an underground buried pipe, as in the prior art, when burying the conduit 1, a foundation gravel 20 is constructed on the upper part of the conduit 1, and a block base 18 and a concrete block 17 are placed thereon. A road surface indicator 16 having a lid is provided on the upper surface 17 so that the upper end thereof coincides with the ground surface, and the half rings 5 and 6 are provided around the conduit 1 via a rubber sheet 9 for protecting the conduit 1 from damage. It is fixed with bolts. In the figure, reference numeral 3 denotes a detection rod, which is formed of a hollow tube. A protection tube 11 is provided around the detection rod 3 and has a length substantially equal to the entire length of the detection rod 3 and a lower end provided with a half ring 5. Is provided in contact with, or fixed to. The upper end of the half ring 5 and the lower end of the detection rod 3 are tiltably connected by a universal joint 30, and the upper end of the detection rod 3 is the center of a disk-shaped spacer 49 slidable in the upper end of the protective cylinder 11. It is tiltably supported by a spherical bearing portion 50 provided in the portion.

FIG. 4 is a detailed sectional view of the universal joint 30. The universal joint 30 connects a base plate 38 welded to the half ring 5 and a reducer 41 screwed into the lower end of the detection rod 3 with a screw 42. The upper and lower ends of the universal joint 32 are fixed to the reducer 41 and the base plate 38 by bolts 40 and headless screws 39, respectively. The universal joint 32 itself has a well-known cruciform joint, but of course, may be of another type, and may be changed to a spring, rubber, or other freely tiltable one. The universal joint 32 is a soft rubber tube 3 filled with grease 36 therein.
4 to prevent intrusion of earth and sand.

FIG. 5 is a detailed sectional view of the spherical bearing 50.
At the upper end of the hollow detection rod 3 extending upward from the conduit 1, an inclination detection device guide 58 is screwed. The inclination detecting device guide 58 is cylindrical and has a tilt detecting device guide hole 60 at the center, and a spherical bearing portion 50 at an intermediate portion on the outer periphery.
Of the spherical inner race 51 is fitted, and the spherical inner race 51 is fixed to the outer periphery of the inclination detecting device guide 58 by a threaded urethane stopper 56. A urethane cap 55 is detachably screwed into the upper end of the inclination detecting device guide 58, and serves as a lid for the inclination detecting device guide hole 60 when measurement is not performed.

The spherical inner race 51 has a spherical outer race 5 fitted to the spherical surface of the spherical inner race 51.
2 is provided so as to be rotatable and tiltable, and the spherical outer race 52 is supported by a disk-shaped spacer 49.
The spacer 49 is loosely fitted to the inner peripheral portion of the protective cylinder 11 so that the inner surface of the protective cylinder 11 can slide up and down.
As a result, the upper end of the detection rod 3 is supported by the spherical bearing 50 so as to be able to rotate, tilt, and move up and down.
Therefore, when the conduit 1 is shifted laterally, the detection rod 3 can be inclined at an angle α as shown in FIG. 1, and at this time, the conduit 1 is shifted if the depth of the universal joint portion 30 is L. Since the length S is L · tan α, the deviation S can be calculated by measuring the angle α. Since the angle α is very small, the sinking amount D of the conduit 1 may be measured at the position of the tip of the detection rod 3 as in the related art.

FIG. 6 is an external view of an inclination detecting device 70 for measuring the angle α. The tilt detecting device 70 includes a tilt angle sensor 71 and an insertion rod 72 provided on the lower surface of the tilt angle sensor 71 and can be inserted into the tilt detecting device guide 58 at the upper end of the detecting rod 3. The urethane cap 55 above the detection device guide 58 is removed, and the insertion rod 72 is inserted into the inclination detection device guide hole 60 and set as shown in the figure. And, the inclination angle sensor 7
The detection signal detected in 1 is sent to an arithmetic and control unit 80 to be described later by an output cable 73.

The tilt angle sensor 71 detects, for example, a vertical direction of a gyro, a pendulum, or the like, and detects a light position from a light emitting unit fixed to a vertical direction detecting unit that holds a detection posture, and detects a light position that moves by inclination. An optical position detection type inclination angle sensor that detects an inclination angle or the like based on a shift of a light detection position is detected by an apparatus. FIG. 7 shows a principle diagram of the light position detection type inclination angle sensor. The center point of the light detection unit 71a is defined as the origin O of the coordinate axis, and the lines passing through the two origins O parallel to the sides of the light detection unit 71a are defined as the X axis and the Y axis. The origin O is a point where when the sensor 71 is placed on a horizontal plane (the insertion rod 72 is vertically downward), light from a light emitting unit fixed to a gyro in the sensor is received. Now, it is assumed that the light is received at the point a of the light detection unit 71a due to the inclination of the sensor 71. The x- and y-axis coordinate points of point a are x and y, respectively, the distance between the origin O and point a is r, the distance between the rotation center point P of the gyro rotor and the origin O is l, and the line segment PO
The angle between the line segment Pa and the line segment Px is β, the angle between the line segment PO and the line segment Py is γ, and the line segment Oa and X
Assuming that the angle with the axis is θ, these relationships are as follows. r = (x ² + y ² ) ^1/2 tan α = r / l tan β = x / l tan γ = y / l tan θ = y / x

When the inclination detecting device 70 is set as shown in FIG. 6, α represents the inclination angle of the detection rod 3, and θ represents the inclination direction of the detection rod 3. On the other hand, the coordinate position (x, y) of the light receiving point a on the X axis and the Y axis
Is obtained as an output of the tilt angle sensor 71, and l is an internal constant of the tilt angle sensor 71 and is a known value. Therefore, the state of the inclination angle of the detection rod 3 can be obtained by calculating the output of the inclination angle sensor 71 by the above-described formulas, and as described above, the movement amount of the conduit 1 can be obtained from the inclination angle. it can.

Next, FIG. 8 shows that the inclination angle α and the inclination direction θ of the detection rod 3 are obtained from the output (x, y) from the inclination angle sensor 71, and the amount of movement of the conduit 1 is obtained from the inclination angle α. FIG. 3 is a circuit block diagram of an arithmetic and control unit 80 for displaying or printing these. In the present embodiment, a microprocessor (hereinafter, referred to as CPU) 81 is used as a means for calculating the inclination angle or the like. 8, reference numeral 71 denotes the above-described tilt angle sensor; 82, an input circuit for selectively outputting an output signal (x, y) from the tilt angle sensor 71 in accordance with a command from the CPU 81; 82, a digital signal from the input circuit 82; A / D converter that converts the analog signal into an analog signal and inputs the analog signal to the CPU 81, and an RO 84 that stores a control program
M, a memory composed of a RAM for temporarily storing data, etc., a liquid crystal display device 85 for receiving an output signal from the CPU 81 via an I / O port and displaying a calculation result in the CPU 81, and 86 similarly This is a printer device for printing the calculation result in the CPU 81. Reference numeral 88 denotes a timer, 89 denotes a battery, and 90 denotes a battery charger.

The operation of the arithmetic and control unit 80 is
This will be described with reference to the flowchart of FIG. After confirming that the inclination angle detecting device is set as shown in FIG. 6, the arithmetic and control unit 80 is turned on (step S1). As a result, the CPU 81 activates the input circuit, and the tilt angle sensor 7
(X, y) signal output from
It is read into U81 (step S2). And r =
Calculate r by (x ² + y ² ) ^1/2 (step S
3), the inclination angle α of the detection rod 3 is calculated from α = tan ⁻¹ (r / l) (step S4), and θ = tan ⁻¹ (y /
x), the inclination direction θ of the detection rod 3 is calculated (step S5). Further, from the calculated α, S = L · tanα
To calculate the movement amount S of the conduit 1 (step S
6). Here, the constants l and L read out the values stored in the memory 84 and use them for the calculation. Then, the calculated inclination angle α, inclination direction θ, and conduit movement amount S are output to the liquid crystal display device 85 (step S7). Further, if necessary (step S8), the calculated inclination angle α, inclination direction θ, and conduit movement amount S are printed on a printer (step S8).
9), end the processing.

[0020]

According to the present invention, by having the above structure, even if the conduit 1 is displaced in any direction, the displacement amount in the horizontal direction, the direction thereof, and the displacement amount in the vertical direction at the displacement position can be more easily made than the ground surface. Since the measurement can be performed, the direction in which the conduit 1 is displaced three-dimensionally can be measured, and it is possible to accurately cope with a lateral or diagonal subsidence that could not be detected conventionally .

[Brief description of the drawings]

FIG. 1 is an operation explanatory view of an apparatus for measuring settlement of a submerged underground pipe according to the present invention.

FIG. 2 is a longitudinal sectional view of the apparatus for measuring settlement of an underground pipe of the present invention.

FIG. 3 is a cross-sectional view of an apparatus for measuring settlement of an underground pipe according to the present invention.

FIG. 4 is a sectional view of a universal joint.

FIG. 5 is a sectional view of a spherical bearing.

FIG. 6 is an external view of a tilt angle detection device.

FIG. 7 is a principle diagram of an inclination angle sensor.

FIG. 8 is a circuit diagram of an arithmetic and control unit.

FIG. 9 is a flowchart illustrating the operation of the arithmetic and control unit.

FIG. 10 is a longitudinal sectional view of a conventional apparatus for measuring settlement of an underground pipe.

FIG. 11 is a cross-sectional view of a conventional apparatus for measuring settlement of an underground pipe.

[Explanation of symbols]

1 conduit 3 Detection rod 30 Universal joint 50 Spherical bearing 70 Tilt angle detector 80 arithmetic and control unit

Claims (2)

(57) [Claims] 1. A detection rod is extended from an underground pipe to the surface of the ground,
In an underground buried pipe subsidence measuring device that measures the amount of movement of the underground pipe by subsidence and movement of the underground pipe by the movement of the detection rod, the underground pipe and the detection rod are connected by a universal joint. And, the amount and direction of movement of the underground buried pipe are measured by the inclination of the detection rod by supporting the upper end of the detection rod with a spherical bearing so as to be tiltable and supporting the spherical bearing vertically. A tilt angle sensor, and an insertion bar provided on a lower surface of the tilt angle sensor and inserted into an upper end of the detection rod to fix the tilt angle sensor to a tip of the detection rod.
And the insertion rod is inserted into the upper end of the detection rod.
A tilt detection device guide with a guide hole
The spherical bearing is fixed to the outer periphery of the inclination detecting device guide.
An apparatus for measuring settlement of underground pipes. 2. An upper end of the guide for the inclination detecting device is provided with
A removable cap is attached during measurement.
The apparatus for measuring settlement of underground buried pipes according to claim 1.