JP7823533B2 - Sensor fixing jig - Google Patents

Description

The present invention relates to a jig for fixing a sensor that acquires information such as water level inside a sewer.

Patent Documents 1 and 2 are known as technologies for fixing water level sensors (water level gauges) that acquire water level information inside pipes.

In Patent Document 1, a throw-in type water level gauge is placed inside a breakwater pipe and fixed by a flange attached to the upper end of the breakwater pipe, and the breakwater pipe is equipped with a plate member that supports a cable connected to the water level gauge.

In Patent Document 2, a water level gauge holder is attached to the sensor fixing plate of a sensor fixing device that is formed to fit the curved surface of the invert bottom of the sewer. The sensor body is housed within this water level gauge holder.

JP 2016-024146 A Japanese Patent Application Laid-Open No. 2020-201290 JP 2015-10403 A Japanese Patent Application Laid-Open No. 2020-2618

In Figure 7, reference numeral 1 denotes the breakwater pipe described in Patent Document 1 and elsewhere. This breakwater pipe 1 is typically fixed to the vertical wall surface 2 of a rectangular waterway such as an irrigation channel. However, in cases where the bottom of a pipe, such as a culvert 3, is arc-shaped, the water level gauge must be installed on the invert 30 inside the manhole, making it difficult to measure the water level from the bottom of the pipe. On the other hand, if a water level gauge is installed at the bottom of the pipe, as shown in Figure 8, the breakwater pipe is inserted into the culvert 3, which raises the risk of debris getting caught and blocking the flow path.

In Figure 9, reference numeral 4 indicates the sensor fixture described in Patent Document 2. A circular waterway (a waterway with a tubular cross section) such as a conduit 3 is fitted with a water level gauge 5 using a sensor fixture 4 described in Patent Document 2, and the sensor fixture 4 is fixed inside the pipe.

Although it is certainly possible to measure the water level from the bottom of the sewer 3 using the sensor fixture 4, if the pipe diameter is large, the sensor fixture 4 itself becomes large, making it difficult to insert into the manhole.

In other words, since the diameter of a typical manhole is around 600 to 900 mm, this method cannot be used if the diameter of the waterway exceeds 900 mm. On the other hand, even if the sensor fixture 4 can be inserted into the manhole, the worker must enter the flowing water during construction, which could pose a risk of the worker being swept away during construction if the water level in the sewer 3 is high and the flow speed is fast.

The present invention was made to solve these conventional problems, and aims to solve the problem of reducing flow path obstruction within the pipe, the effects of pipe diameter size, and the dangers of construction work in a fixture for fixing sensors that measure information from the bottom of a pipe.

(1) The present invention is a jig for fixing a sensor that measures information inside a sewer,
a jig body formed in an articulated shape;
a sensor mounting portion provided at a lower end of the jig body and to which the sensor is attached;
The jig body can be attached along the inner peripheral surface of the culvert.

(2) One aspect of the jig body includes at least three or more split jigs,
The dividing jigs are each connected to each other so as to be able to rotate freely.

(3) One aspect of the dividing jig includes a dividing portion having a U-shaped cross section,
the jig body includes a row of accommodating portions formed within the group of divided portions,
The housing section is characterized in that a cable is housed in the housing section to transmit measurement information from the sensor to a communication control device installed on the manhole side above the culvert.

(4) Another aspect of the dividing jig includes a fixing portion that fixes the dividing portion,
The fixing portions of at least two or more of the dividing jigs are fixed to the wall surface.

(5) One aspect of the sensor mounting portion is characterized in that it is rotatably connected to the lower end of the dividing jig located at the lowest level.

According to the present invention, in a fixture for a sensor that measures information from the bottom of a pipe , it is possible to reduce flow path obstruction within the pipe, the effects of the pipe diameter size, and the risks of construction work.

FIG. 2 is a diagram showing an installation state of a sensor fixing jig according to an embodiment of the present invention. The same perspective view. Side view of the same. Rear view of the same. FIG. A schematic diagram of the fixed state inside the sewer. FIG. 1 is a diagram showing a fixed state using the wave protection tube of Patent Document 1. Application diagram to the same sewer. FIG. 10 is a diagram showing a state of fixation using the sensor fixture of Patent Document 2. Schematic diagram of an invert installed at the bottom of a manhole.

The following describes a sensor fixing jig according to an embodiment of the present invention. This jig is used to fix sensors that measure various types of information inside pipes, such as sewer pipes and water pipes.

Here, the jig will be explained based on an example of fixing a water level sensor that measures water level information inside a sewer. This water level sensor is connected by wire or wirelessly to a communication control device (see Patent Documents 3 and 4) installed, for example, inside a manhole that communicates with the sewer or on a manhole cover that closes the upper opening of the manhole. This makes it possible for the water level information measured by the water level sensor to be transmitted via the communication control device to a management server (not shown) or similar device.

To explain the installation situation based on Figure 1, 10 indicates the communication control device installed inside the manhole 12, H indicates the upstream side of the sewer 3, L indicates the downstream side of the sewer 3, and 15 indicates the jig fixed along the bottom of the sewer 3.

<Configuration example of the jig 15>
2 to 5, a configuration example of the jig 15 will be described. The jig 15 includes a jig body 16 formed in an articulated shape and a sensor mounting portion 24 provided at the lower end of the jig body 16 to which a water level sensor 25 can be attached.

(1) In Figures 2 to 4, 17a to 17d indicate multiple dividing jigs 17 that are connected so that they can rotate freely. The jig main body 16 is formed by connecting these dividing jigs 17a to 17d.

However, the number of dividing jigs 17 can be changed as appropriate depending on the size of the pipe, etc. For normal sizes, it is preferable to use a jig main body 16 in which three to five dividing jigs 17 are connected. Here, as an example, we will explain a jig main body 16 in which dividing jigs 17a to 17d are connected.

The dividing jigs 17a to 17d are each formed in the same shape, and as shown in Figures 2 and 3, each include a dividing section 19 formed with a U-shaped cross section and a pair of left and right fixing plates 20 that fix the dividing section 19 in place.

That is, as shown in Figures 3 and 4, the dividing section 19 comprises a bottom plate 19a and side plates 19b erected approximately vertically from both sides of the bottom plate 19a. Each dividing section 19 has spaces P1 to P4 between the bottom plate 19a and each side plate 19b, and through holes 21a (see Figure 3) through which pins 21 are inserted are formed at the upper and lower ends of each side plate 19b.

By inserting pins 21 through these through-holes 21a, adjacent dividing jigs 17a-17d are rotatably connected to each other. This forms the jig body 16 in an articulated shape, allowing the dividing jigs 17a-17d to rotate and deform the jig body 16 into a curved shape, as shown in Figure 5.

The left and right fixing plates 20 are formed by bending horizontally from the upper end of each side plate 19b. Each fixing plate 20 has a pair of upper and lower fixing holes 20a, 20b. These fixing holes 20a, 20b are formed as vertically elongated holes (slots), and the jig 15 is fixed by driving anchors (not shown) through the fixing holes 20a, 20b.

(2) The sensor mounting section 24, like the dividing section 19, has a U-shaped cross section, with side plates 24b extending approximately perpendicularly from both sides of the bottom plate 24a. A space P5 is formed between the bottom plate 24a and each side plate 24b, and a through-hole (not shown) through which the pin 21 is inserted is formed at the upper end of each side plate 19b.

By inserting a pin 21 through this through-hole, the sensor mounting section 24 is rotatably connected to the lowest dividing jig 17d. This connects spaces P1 to P5, forming a row of spaces P. This space P accommodates a cable connecting the wired water level sensor 18 and the communication control device 10. In this sense, space P can be called a cable accommodation section.

Meanwhile, a water level sensor 25 is housed within the lower end of the sensor mounting portion 24. This water level sensor 25 comprises a sensor holder that is fixed within the sensor mounting portion 24 by known means, such as screwing, fitting, or fastening, and a sensor body that is built into the sensor holder and measures the water level within the sewer.

≪Fixing method≫
A method for fixing the water level sensor 25 using the jig 15 will be described below. Here, an example of fixing the sensor to the culvert 3 shown in Fig. 1 will be described. The culvert 3 is formed as a circular waterway (with a circular tubular cross section) with an arc-shaped bottom.

First, the water level sensor 25 is fixed to the sensor mounting portion 24, and the manhole cover (not shown) is opened and the jig 15 is inserted into the manhole 12. Next, the jig 15 is carried to the invert 30 (see Figure 10) inside the manhole 12, and the jig 15 is fixed to the downstream side L of the sewer 3, as shown in Figure 1.

That is, the anchors are driven into the wall surface through the fixing holes 20a, 20b of the dividing jigs 17a to 17d and fixed in place. However, it is not necessary to fix all of the dividing jigs 17a to 17d; it is sufficient to fix any two or more depending on the water level during construction, and the cable is fixed while housed within the space P.

At this time, the jig body 16 is constructed by rotatably connecting the dividing jigs 17a to 17d, so as shown in Figure 5, it curves and deforms along the curvature of the inner surface (arc-shaped wall surface) of the pipe 3. Furthermore, because the sensor mounting part 24 is rotatably connected to the dividing jig 17d, it is positioned facing the bottom of the pipe along the inner surface of the pipe 3.

As a result, as shown in Figure 6, the water level sensor 25 is placed on the inner surface of the pipe bottom of the sewer 3, making it possible for the sensor body to measure water level information from the pipe bottom. The water level information measured here is transmitted to the communication control device 10 via the cable, and then sent from the communication control device 10 to the management server.

This type of jig 15 can be fixed along the inner surface of the pipe 3, making it possible to measure water level information from the pipe bottom without causing flow path obstruction, as occurs when using the wave breaker pipe 1 of Patent Document 1. Similarly, because the cable is housed in the space P, there is no flow path obstruction caused by the cable.

In addition, although the jig 15 is long, it is narrow and can be easily inserted into the manhole 12. Therefore, unlike the sensor fixing device 4 in Patent Document 2, the jig 15 is not affected by the size of the pipe diameter, and can be used without any problems in large waterway culverts with large pipe diameters.

Furthermore, workers can select any of the dividing jigs 17a to 17d within reach from the top of the invert 30. For example, they can select only the upper dividing jigs 17a and 17b and perform construction work without entering the waterway inside the sewer 3.

This prevents workers from being swept away even when the water level in the waterway is high or the flow rate is fast. Furthermore, because the fixing holes 20a and 20b are elongated holes, it is easy to adjust the position of the long side of the holes when fixing the jig 15 with the anchors.

The present invention is not limited to the above embodiment, and can be modified and implemented within the scope of the claims. For example, the jig 15 can be used to measure water levels not only in circular waterways, but also in waterways with rectangular cross sections, such as irrigation channels.

In addition, instead of the water level sensor 25, other sensors capable of measuring information inside the sewer, such as a flow velocity sensor or a flow rate sensor, may be attached to the sensor mounting portion 24.

3... Pipe 10... Communication control device 15... Sensor fixing jig 16... Jig body 24... Sensor mounting portion 17a to 17d... Dividing jig 19... Dividing portion 20... Fixing plate (fixing portion)
P...Storage section

Claims (3)

A jig for fixing a sensor that measures information inside a sewer,
a jig body formed in an articulated shape;
a sensor mounting portion provided at a lower end of the jig body and to which the sensor is attached;
Equipped with
The jig body can be attached along an inner peripheral surface of the culvert,
The jig body includes at least three or more split jigs,
The dividing jigs are rotatably connected to each other,
The dividing jig is
The dividing portion has a cross section that is substantially U-shaped,
the jig body includes a row of accommodating portions formed within the group of divided portions,
The housing accommodates a cable for transmitting measurement information from the sensor to a communication control device installed on the manhole side above the culvert.
A sensor fixing jig characterized by the above. the dividing jig includes a fixing portion that fixes the dividing portion,
2. The sensor fixing jig according to claim 1 , wherein the fixing portions of at least two of the split jigs are fixed to a wall surface of the culvert . 3. The sensor fixing jig according to claim 1 , wherein the sensor attachment portion is rotatably connected to a lower end of the dividing jig arranged at the lowest level.