JPH06307894A - Uneven settlement measuring device - Google Patents

Abstract

PURPOSE:To provide a uneven settlement measuring device, which can measure water level of each point of measurement at the only reference point without providing a water level measuring device per point of measurement. CONSTITUTION:A device I for monitoring and grasping the uneven settlement of a building due to the ground settlement is provided with a water level measuring device 1, which is provided at an observation reference point A, constant water level devices 2, 2', 2'', which are provided at one or more of points of measurement B, B', B'' and from which the water is overflowed at each leveling point b, b', b'', and a water supplying means for supplying water to the water level measuring device 1 and the constant water level devices 2, 2', 2'' through a ventilation pipe 7. The water level measuring device 1 and the constant water level devices 2, 2', 2'' are communicated with each other by the ventilation pipe 7, and a water supply control means is interposed in the ventilation pipe 7 so that the water can be supplied from the water supplying means to the water level measuring device 1 and the constant water level device of a desired point of measurement, and drain pipes 12b, 12b', 12b'' for draining the overflowed water are connected to the constant water level devices 2, 2', 2''.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential settlement measuring device, and more particularly to a device for ascertaining the differential settlement situation in the foundation ground of a building.

[0002]

2. Description of the Related Art Uneven settlement of buildings caused by ground settlement,
Since slight inclinations are extremely difficult to predict during construction, it is the current situation that the subsidence situation of the foundation ground is monitored and grasped at all times or after a certain period of time after construction, and is corrected by a jack or the like each time. A conventional apparatus for observing this differential settlement will be described with reference to the schematic configuration diagram of FIG.

In the differential settlement measuring device II, a reference water tank 21 is installed at a reference point C for observation, and normally, a plurality of measuring points (here, two measuring points) D, D'are used for measuring the water level 2
2, 22 'are provided respectively. The water tank 21 and the water level measuring devices 22 and 22 'are communicated with each other by a ventilation pipe 28, and their internal pressures are kept equal and constant. Further, the water tank 21 and the devices 22, 22 'are connected by a water pipe 27, and the pipe 27 is provided so as to extend into the devices 22, 22' substantially vertically from below (27 ', 27 ").

For example, when observing the measurement point D, water is first supplied into the reference water tank 21 from the water supply pump 23 through the water supply pipe 29. Water reaches the pipe 27 ′ in the water level measuring device 22 via the water pipe 27. The water supply to the device 22 'at the measurement point D'is blocked by the control of a valve (not shown). When the water level in the water tank 21 matches the preset reference water level c, the water supply is stopped and the water level d in the pipe 27 'is read. By comparing this value d with the previous or next measured value, the subsidence situation is grasped.

As the measuring method of the measuring devices 22 and 22 ', a float is floated on the surface of the water and the upper and lower sides of the float are recorded, pressure is measured to know the water level, electric resistance is measured and converted into a water level, and a sensor is used. There are things to use.

Although not shown, each water level measuring device 2
Data recording from 2, 22 ', control of valves and pumps 23, etc. are collectively controlled via cables and the like.

[0007]

However, in the above-mentioned conventional device, a water level measuring device which requires a high degree of accuracy and requires regular maintenance must be installed at each measuring point. Therefore, for example, there is a problem that it is necessary to secure a space for maintenance for each water level measuring device.

The present invention has been made to solve the above problems, and an object thereof is to provide a differential settlement measuring device capable of measuring each measuring point only with a reference point, without the need to install a water level measuring device at each measuring point. To provide.

[0009]

The differential settlement measuring device of the present invention has the above-mentioned object, and its gist is to provide an observation reference point in a device for monitoring and grasping the differential settlement of a building due to ground subsidence. The water level measuring device installed in the above, a constant water level device provided at each of one or more measurement points, at which water overflows at the water piling point, and water is supplied to the water level measuring device and the constant water level device through a water pipe. A water supply means is provided, and the water level measuring device and the constant water level device are connected to each other by a ventilation pipe, so that water can be supplied from the water supply means to the water level measuring device and the constant water level device at one desired measurement point. A water supply control means is interposed in the water flow pipe, and a drain pipe for draining overflowed water is connected to the constant water level device.

[0010]

In the differential settlement measuring device of the present invention, the water level measuring device is installed only at the reference point. Further, the constant water level in the constant water level device at the measurement point can be obtained as the water pour point where water overflows.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing a differential settlement measuring apparatus I of the present invention installed on the foundation of a building. The subsidence measuring device I includes a water level measuring device 1 installed at one reference point A defined as a reference point for observation, and a measurement point B selected as a point for measuring a vertical displacement with respect to the reference point A.
Constant water level devices 2, 2 ', 2 "provided at B', B" respectively
With.

The water level measuring device 1 and the constant water level device 2,
2'and 2 "are connected by a ventilation pipe 8 so that the air pressures in the internal spaces of the respective devices 1 and 2, 2 ', 2" are kept equal and constant. Water level measuring device 1 and constant water level device 2, 2 ',
Water can be supplied to 2 "through a water pipe 7 by a circulation pump 3 as a water supply means. The water pipe 7 branches off from the base pipe 7 and extends substantially vertically from below into the water level measuring device 1. A part of the water level measuring device 1 is configured as the water level measuring pipe 7a, and the water level measuring pipes 7b and 7b 'are partly extended to the constant water level devices 2, 2', 2 ". , 7
b ".

The water pipe 7 has branching water filling pipes 7b and 7b.
Valves 9, 9 ′ and 9 ″ serving as water supply control means are provided at the positions toward b ′ and 7 b ″, and individual water supply from the pump 3 to the constant water level devices 2, 2 ′ and 2 ″ is possible. Further, the water pipe 7 is provided with valves 10 and 11 as water supply control means before and after branching of the base pipe.
9 ', 9 ", 10 and 11 are unitized (5), and this control unit 5 is connected to the monitoring control unit 4 via the control cable 13.
Are collectively controlled by. The monitoring control unit 4 also operates the pump 3 through the cable 13 and collects and records the data of the water level measuring device 1 from the data transfer cable 14.

Drain pipes 12b, 12b ', 12b "are connected to the bottoms of the constant water level devices 2, 2', 2", and these pipes 12b, 12b ', 12b "are connected to the water collecting device 6. It communicates with the drain pipe 12. This drain pipe 1
The end of the water pipe 7 also communicates with 2. The water collecting device 6 and the circulation pipe 3 are connected by a pipe 12 '. In addition, as the water level measuring device, for example, a water-filling type subsidence meter (HRV-31H: manufactured by Sakata Electric Co., Ltd.) using a photocell can be used.

Next, the mode of measurement by the differential settlement measuring device I will be described by taking the case where the measuring point B is selected as the measuring point. First, the monitoring control unit 4 instructs opening of the valves 9 and 10 and closing of the valves 9 ′ and 9 ″ and the valve 11 of the water pipe 7 leading to measurement points B ′ and B ″ other than the measurement point B, and then the pump 3 Water supply from. Water enters the water level measuring device 1 and the constant water level device 2, and when the water surely overflows from the water filling pipe 7b in the device 2, the water supply is stopped. The water level measurement value a of the water level measuring pipe 7a in the device 1 at this time is read. Since the internal pressures of the devices 1 and 2 are kept equal and constant as described above, the reference point A and the measurement point B
When there is no relative displacement in the vertical direction with respect to, the water level in the water level measuring pipe 7a always indicates a constant value.
By comparing with the value of the previous time or the value of the next time, it is possible to grasp the present condition of the subsidence of the measurement point B.

The water overflowing from the water filling pipes 7b, 7b ', 7b "is collected from the drain pipes 12b, 12b', 12b" to the water collecting device 6 through the drain pipe 12, and water for draining after the measurement is finished. Is also collected in the water collecting device 6 through the opened valve 11. This water is returned to the circulation pump 3 from the pipe 12 '.

In this embodiment, the water level measuring device 1 is installed only at the reference point A, and the valves 9, 9 ', 9 "10, 11 are gathered in the control unit 5, so that the cables 13, 14 can be easily installed. The cost can be reduced compared to the conventional device such as a small number, etc. When the piping becomes complicated, the valves 9, 9 ', 9 "are fixed level devices at the measuring points B, B', B" 2. It can be placed every 2 ', 2 ".

[0019]

[Effect] In the differential settlement measuring device of the present invention, the entire device can be simplified and the reliability can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a differential settlement measuring device of the present invention.

FIG. 2 is a schematic configuration diagram showing a conventional differential settlement measuring device.

[Explanation of symbols]

 I Differential settlement measuring device A Reference point B, B ', B "Measuring point a Water level measurement value b, b', b" Water level point 1 Water level measuring device 2, 2 ', 2 "Constant water level device 3 Circulation pump 4 Monitoring Control unit 5 Control unit 6 Water collecting device 7 Water pipe 8 Vent pipe 9, 9 ', 9 ", 10, 11 Valve 12, 12b, 12b', 12b" Drain pipe

Claims (1)

[Claims] 1. A device for monitoring and ascertaining uneven settlement of a building due to ground subsidence, comprising: a water level measuring device installed at an observation reference point; and water at a water filling point provided at each one or more measuring points. Is provided with a constant water level device that overflows, and a water supply means that supplies water to the water level measuring device and the constant water level device via a water pipe, and the water level measuring device and the constant water level device are connected by a ventilation pipe, and the water level To the measuring device and the constant water level device at one desired measurement point, the water supply pipe is provided with water supply control means so that water can be supplied from the water supply means, and the drainage for draining the overflowed water to the constant water level device A differential settlement measuring device characterized by connecting pipes.