Sensor fixing jig

Abstract

To suppress danger in construction work and deterioration in workability by reducing flow passage obstruction in a sewer and an influence of a large pipe diameter with respect to a fixing jig for a sensor which measures information from the pipe bottom of the sewer.SOLUTION: A fixing jig 20 for a sensor comprises an arcuate jig body 21 fitted with a water level sensor 22, guide holes 25a, 25b formed on both sides of the jig body 21, and fixtures 23a, 23b and 24a, 24b for fitting both sides to an inner wall 3a of a sewer 3. Anchor bolts 28 embedded in the inner wall 3a of the sewer 3 are inserted into through holes 27 and guide holes 25a, 25b of the fixtures 23a, 24a and fastened with nuts to fix the fixing jig 20 to the inner wall 3a.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a jig for fixing a sensor that acquires various types of information inside a sewer. [Background technology]

[0002] Patent Documents 1 and 2 are known as techniques for fixing a water level sensor (water level gauge) that acquires information about the water level inside a pipe.

[0003] In Patent Document 1, a throw-in type water level meter is inserted into 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 meter.

[0004] In Patent Document 2, a water level gauge holder is attached to a sensor fixing plate of a sensor fixing device formed according to the curved surface of the bottom surface of the invert of a culvert. The sensor main body is housed in this water level gauge holder. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-024146 [Patent Document 2] Japanese Patent Application Publication No. 2020-201290 [Patent Document 3] Japanese Patent Application Laid-Open No. 2015-10403 [Patent Document 4] Japanese Patent Publication No. 2020-2618 Summary of the Invention [Problem to be solved by the invention]

[0006] In Fig. 7, reference numeral 1 denotes the breakwater pipe described in Patent Document 1 and elsewhere. This breakwater pipe 1 is usually fixed to a vertical wall surface 2 of a rectangular waterway such as an irrigation channel. However, when the pipe bottom is arc-shaped, such as in a culvert 3, the water level meter must be installed on an invert 30 (see Fig. 10) inside a manhole, making it difficult to perform sensing (measurement of water level, flow velocity, etc.) from the pipe bottom.

[0007] On the other hand, if a water level gauge is to be installed at the bottom of the pipe, as shown in Figure 8, a breakwater pipe is inserted into the pipe 3, and there is a risk that debris may get caught and block the flow path. Furthermore, when inspecting sensors such as pressure-type water level gauges or adjusting the zero point when replacing sensors, it is necessary to remove all of the fixing metal fittings 1a, etc. In this case, restoring the current state essentially means new construction, which makes positioning difficult and could lead to a deterioration in workability.

[0008] 9 indicates the sensor fixture 4 of Patent Document 2. In the case of a circular waterway (a waterway with a tubular cross section) such as a culvert 3, a water level meter 5 is mounted on the sensor fixture 4 of Patent Document 2 or the like, and the sensor fixture 4 is fixed inside the pipe.

[0009] Although it is certainly possible to sense from the bottom of the pipe 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.

[0010] That is, since the opening diameter of a typical manhole is about 600 to 900 mm, it cannot be applied when the diameter of the waterway pipe exceeds 900 mm. Furthermore, when performing inspections such as the zero point adjustment, it is necessary to remove all of the sensor fixing devices 4, which may pose a risk of workers being swept away if the water level in the sewer 3 is high and the flow velocity is fast.

[0011] The present invention has been made to solve these conventional problems, and aims to solve the problem of reducing the effects of flow path obstruction within a pipe and the size of the pipe diameter in a fixture for fixing a sensor that measures information from the bottom of a pipe, thereby suppressing the danger of construction work and the deterioration of workability. [Means for solving the problem]

[0012] (1) The present invention is a fixture for fixing a sensor that measures various information inside a sewer, an arc-shaped jig body to which the sensor is attached; Guide holes formed on both sides of the jig body; Fixtures for attaching each of the two sides to the inner wall of the conduit; a through hole formed in each of the fixing members and communicating with the guide hole; Equipped with The sensor Attached between both sides of the jig body, The guide hole is The jig body is configured by a long hole formed along the longitudinal direction thereof, The jig body is The anchor bolt fixed to the inner wall of the culvert is inserted into the guide hole and the through hole and fastened with a nut to fix the anchor bolt to the inner wall, The nuts can be loosened to allow the inner wall to slide along the guide holes in the circumferential direction of the inner wall.

[0013] (2) It is preferable to form stoppers at both ends of the jig body to limit the sliding movement, and the jig body may be elastically deformable according to the curvature of the inner wall, and further the fixing device may be attached to the inner wall by pressing down on both sides.

[0014] (3) A plurality of the fixing devices may be provided for each side. In this case, each fixing device has a hole formed therein for fixing to the inner wall, and the anchor bolt is inserted into the through-hole of the selected fixing device and the nut is fastened. On the other hand, the fixing devices that are not selected hold down the jig body by fastening the bolts inserted into the hole to the inner wall, and the fastening is loosened during the sliding movement. [Effects of the Invention]

[0015] According to the present invention, in a fixture for fixing a sensor that measures information from the bottom of a pipe, the effects of flow path obstruction within the pipe and the size of the pipe diameter can be reduced, thereby suppressing the risk of construction work and deterioration of workability. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a diagram showing an installation state of the sensor fixing jig according to the embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing the sensor fixing jig of the first embodiment. [Figure 3] 1A is a longitudinal cross-sectional view showing the sensor fixing jig of Example 1 when it is placed, and FIG. 1B is a longitudinal cross-sectional view showing the same when it is inspected. [Figure 4] FIG. 2 is a longitudinal cross-sectional view of the inside of a conduit in which the sensor fixing jig of the first embodiment is installed. [Figure 5] FIG. 10 is a perspective view showing a sensor fixing jig according to a second embodiment. [Figure 6] 10A is a longitudinal cross-sectional view showing the sensor fixing jig of Example 2 when it is installed, and FIG. 10B is a longitudinal cross-sectional view showing the same when it is inspected. [Figure 7] A diagram of the fixed state using the wave protection tube in Patent Document 1. [Figure 8] Application diagram to the same sewer. [Figure 9] FIG. 1 is a diagram showing the state of fixation using the sensor fixture of Patent Document 2. [Figure 10] Schematic diagram of an invert installed at the bottom of a manhole. DETAILED DESCRIPTION OF THE INVENTION

[0017] A sensor fixing jig according to an embodiment of the present invention will be described below. This jig is used to fix sensors that measure various types of information inside pipes such as sewer pipes and water pipes.

[0018] 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 inside a manhole that communicates with the sewer / on the manhole cover that closes the upper opening of the manhole. This makes it possible to transmit water level information measured by the water level sensor via the communication control device to a management server (not shown) or the like.

[0019] Explaining the installation situation based on Figure 1, 10 indicates a communication control device installed in a manhole 12, H indicates the upstream side of the sewer 3, L indicates the downstream side of the sewer 3, and 20 indicates the semicircular jig fixed along the inner wall 3a of the sewer 3. [Example]

[0020] 2 to 4, a first embodiment of the jig 20 will be described. The jig 20 of this embodiment is mainly used when the pipe bottom of the tubular culvert 3 is located at the lowest part of the arc-shaped inner wall 3a (see FIG. 4).

[0021] (1) Configuration example As shown in Figure 2, the jig 20 comprises a jig body 21 to which a water level sensor 22 is attached, and metal fasteners 23a, 23b, 24a, and 24b that fix both sides of the jig body 21 to the inner wall 3a of the culvert 3.

[0022] The jig body 21 is made of an elastically deformable stainless steel thin plate bent into a substantially semicircular arc, and has bent end portions at stoppers 41. A pair of guide holes 25a, 25b are formed on both sides (end portions) of the jig body 21.

[0023] The guide holes 25a, 25b are formed as long holes along the longitudinal direction of the jig body 21, and a pair of guide holes 25a are formed in parallel on one end side of the jig body 22, while a pair of guide holes 25b are formed in parallel on the other end side of the jig body 22.

[0024] At this time, anchor bolts 28 that can be inserted into the guide holes 25a, 25b are embedded in the inner wall of the culvert 3. Two anchor bolts 28 are embedded in each of the guide holes 25a, 25b.

[0025] For example, a pressure-type water level meter that is submerged in the target water surface and measures the water level using water pressure may be used as the water level sensor 22. This water level sensor 22 is fixed by screws or the like to approximately the center of the jig body 21, i.e., between the group of guide holes 25a and the group of guide holes 25b.

[0026] Fixtures 23a, 23b, 24a, and 24b are each formed in a similar rectangular shape, and have holes 26 formed at both ends and a pair of through holes 27 formed between holes 26. Holes 26 communicate with perforations (not shown) formed beforehand in inner wall 3a of tubular culvert 3, while through holes 27 communicate with guide holes 25a and 25b.

[0027] Here, one of the fixing devices 23a and 23b is selected to insert the anchor bolt 28 into the through hole 27. Similarly, one of the fixing devices 24a and 24b is selected to insert the anchor bolt 28 into the through hole 27.

[0028] 2, fasteners 23a and 24a are selected, and nuts 29 are fastened to anchor bolts 28 inserted into the respective through holes 27. Bolts 40 are inserted into the holes 26 of the unselected fasteners 23b and 24b, and are fixed to the drilled holes.

[0029] At this time, it is preferable to fasten the bolt 40 through the drilled hole to an insert nut (not shown) embedded in the inner wall 3a. Note that the selection is not limited to that shown in Fig. 2 and may be arbitrary, and the fixing devices 23b and 24b may be selected.

[0030] (2) Fixing method A method for fixing the water level sensor 22 using the jig 20 will be described. Here, an example of fixing 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.

[0031] First, the water level sensor 22 is fixed to the approximate center of the jig body 21 in advance, and the manhole cover (not shown) is opened and the jig 20 is inserted into the manhole 12. Next, the jig 20 is carried to the invert 30 (see FIG. 10) inside the manhole 12, and the jig body 21 is brought into close contact with the inner wall 3a of the culvert 3 as shown in FIG.

[0032] In this state, the jig 15 is fixed to the downstream side L of the duct 3. At this time, fixtures 23a, 23b, 24a, and 24b are selected, with anchor bolts 28 being inserted into through holes 27. For example, when fixtures 23a and 24a are selected as in FIG. 2, nuts 29 are fastened to anchor bolts 28 inserted into the respective through holes 27, as described above, while bolts 40 are inserted into holes 26 of fixtures 23b and 24b and fastened to the insert nuts.

[0033] As a result, the jig body 21 is fixed to the inner wall 3a with both sides held down by the fixing devices 23a, 23b, 24a, and 24b, as shown in Figure 3(a). At this time, the water level sensor 22 is attached to approximately the center of the jig body 21, and is therefore placed at the bottom of the sewer 3, as shown in Figure 4. At this point, the water level sensor 22 can measure the water level from the bottom of the pipe. The water level information measured here is transmitted to the communication control device 10 via a cable, and then sent from the communication control device 10 to the management server.

[0034] In this way, the jig 20 is fixed along the inner wall 3a of the pipe culvert 3, so that water level information can be measured from the bottom of the pipe without causing flow path obstruction as occurs when the breakwater pipe 1 of Patent Document 1 is used.

[0035] Furthermore, because the jig body 21 is arc-shaped, it can be easily inserted into the manhole 12. Therefore, the jig 20 is not affected by the size of the pipe diameter, unlike the sensor fixture 4 of Patent Document 2, and can be used without problems in the culverts of large waterways with large pipe diameters. Note that, when the pipe diameter of the culvert 3 exceeds 900 mm, the jig body 21 can be bent and inserted into the manhole 12, and installed on the inner wall 3a.

[0036] (3) Operation example during inspection An example of the operation during inspection inside the culvert 3 will be described with reference to Fig. 3. Here, it is assumed that the jig 20 is fixed to the inner wall 3a in the state shown in Fig. 3(a) (the same state as Fig. 2).

[0037] In this case, when nuts 29 that secure fixtures 23a and 24a are loosened and jig body 21 is pulled up, jig body 21 slides in the circumferential direction (arrow P direction or arrow Q direction) along guide holes 25a and 25b.

[0038] That is, by sliding the jig body 21 within the range of the guide holes 25a, 25b, the water level sensor 22 can be removed from the water. At this time, stoppers 41 are formed by bending both ends of the jig body 21, so that the water level sensor 22 is prevented from falling off the fixing devices 23a, 24a when sliding.

[0039] 3(b) shows the state in which the jig body 21 has been slid in the direction of arrow P, with the water level sensor 22 moving upward along the circumferential direction from the bottom of the pipe. If the water level sensor 22 is not submerged in water at this time, the nut 29 can be tightened to fix the jig body 21 in this state, making it possible to inspect or replace the water level sensor 22.

[0040] That is, it is possible to move the water level sensor 22 away from the water surface without removing the jig body 21 from the inner wall 3a, facilitating zero point adjustment of the water level sensor 22. After this operation, the jig body 21 is slid in the direction of arrow Q to return the water level sensor 22 to the bottom of the pipe, and then the nut 29 is tightened.

[0041] In contrast, the zero point adjustment in Patent Document 2 requires the complete removal of the sensor fixture 4 and the floating of the sensor fixture 4 and water level gauge 5 on the water surface. This work poses a risk of the worker being swept away if the water level in the sewer 3 is high and the flow rate is fast. In this respect, according to this embodiment, the worker can be prevented from being swept away by simply loosening the nut 29 and sliding the jig body 21.

[0042] Furthermore, in the breakwater pipe type of Patent Document 1, the restoration of the current state after the zero point correction of the water level gauge requires new construction, which deteriorates workability.In this respect, in the present embodiment, since there is no need to remove the jig body 21 from the inner wall 3a, the inspection work is easy, improving workability and reducing the burden on workers. [Example]

[0043] A second embodiment of the jig 20 will be described with reference to FIGS. 5 and 6. In this embodiment, (1) One of the fixing members 23a and 23b (2) One of the fixing devices 24a and 24b This embodiment differs from the first embodiment in that the jig body 21 is welded to the jig body 21.

[0044] 5 shows the state in which fixtures 23b and 24a, which are arranged on one diagonal of jig body 21, have been welded. Here, fixtures 23b and 24a have bolts 40 inserted into holes 26 and fastened to the insert nuts. Furthermore, fixtures 23a and 24b, which are arranged on the other diagonal of jig body 21, have anchor bolts 28 inserted into through holes 27 and fastened to nuts 29.

[0045] As a result, the jig body 21 is fixed to the inner wall 3a with both sides held down by the fixing members 23a, 23b, 24a, and 24b, as shown in Figure 6(a). At this time, the water level sensor 22 is placed at the bottom of the sewer 3, and the water level sensor 22 can measure the water level from the bottom of the pipe.

[0046] However, in this embodiment, when the jig body 21 is slid, not only must the nuts 29 fastened to the anchor bolts 28 be loosened, but also the fastening between each bolt 40 and the insert nut must be released.

[0047] After this operation, when the jig body 21 is pulled up, the jig body 21 slides in the circumferential direction (the direction of arrow P or arrow Q) along the guide holes 25a, 25b. Figure 6(b) shows the state in which the jig body 21 has been slid in the direction of arrow P, and the water level sensor 22 has moved upward in the circumferential direction from the bottom of the pipe.

[0048] Therefore, if the nuts 29 are tightened in this state, the jig body 21 is fixed, making it possible to inspect the water level sensor 22 and the like, thereby reducing the danger to workers and the deterioration of workability during inspection, as in Example 1. In this case, the jig body 21 may be fixed by fastening each bolt 40 to another insert nut embedded in the inner wall 3a.

[0049] 5 and 6, the fixing members 23a and 24b may be welded to the jig body 21. In this case, anchor bolts 28 are inserted into the through holes of the fixing members 23b and 24a, and nuts 29 are fastened.

[0050] Other examples The present invention is not limited to the above embodiment and can be modified and implemented within the scope of the claims. For example, instead of the water level sensor 22, a sensor for measuring other information inside the sewer (such as a flow velocity sensor or a flow rate sensor) may be attached to the jig body 21. Furthermore, the number of fixing devices 23a, 23b, 24a, and 24b is not limited to four, and it is sufficient that the same number is provided on both sides of the jig body 21. [Explanation of symbols]

[0051] 3…Pipe culvert 3a…Inner wall 20...Sensor fixing jig 21...Jig body 22...Water level sensor 23a, 23b, 24a, 24b…Fixing tool 25a, 25b...Guide holes 26...hole 27...Through hole 28...Anchor bolt 29...Nat 41...Stopper

Claims

1. A fixture for fixing a sensor that measures various information inside a sewer, an arc-shaped jig body to which the sensor is attached; Guide holes formed on both sides of the jig body; Fixtures for attaching each of the two sides to the inner wall of the conduit; a through hole formed in each of the fixing members and communicating with the guide hole; Equipped with The sensor Attached between both sides of the jig body, The guide hole is The jig body is configured by a long hole formed along the longitudinal direction thereof, The jig body is The anchor bolt fixed to the inner wall of the culvert is inserted into the guide hole and the through hole and fastened with a nut to fix the anchor bolt to the inner wall, A sensor fixing jig that can be slid in the circumferential direction of the inner wall along each of the guide holes by loosening the nuts.

2. At both ends of the jig body, 2. The sensor fixing jig according to claim 1, wherein a stopper is formed to limit the sliding movement.

3. The jig body is 3. The sensor fixing jig according to claim 1, wherein the sensor fixing jig is elastically deformable in accordance with the curvature of the inner wall.

4. The fixture is 3. The sensor fixing jig according to claim 1, wherein the sensor fixing jig is attached to the inner wall by pressing down both sides.

5. A plurality of the fixing devices are provided on each side, Each of the fixing devices has a hole formed therein for fixing to the inner wall, The anchor bolt is inserted into the through-hole of the selected fastener and the nut is fastened. The fixing jig that has not been selected holds the jig body by fixing the bolt inserted into the hole portion to the inner wall, 3. The sensor fixing metal fitting according to claim 1, wherein the fastening is loosened during the sliding movement.

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