JP7351138B2 - Cable pit improvement method - Google Patents

Description

The present invention relates to a cable pit improvement method for improving a cable pit in which cables are laid.

Conventionally, in the cable pit outside the building of a facility where cables such as control cables are laid, inflow water such as rainwater is constantly drained using submersible pumps, but when there is a lot of inflow water due to heavy rain, the drainage cannot catch up and the cables The water level in the pit was high, and the water level in the cable pit inside the facility building was also high. If the cable pit inside the facility building was flooded, the humidity could have negative effects such as rusting on the terminals of the control panels and mold on the terminals of the control panels. .

As a related technology, specifically, for example, a wiring rack in a cable pit has a support that extends in the vertical direction and is provided with an insertion hole nut at the upper end, and a wiring shelf that is arranged on the support and on which cables are placed. There is a technology related to a cable pit wiring rack structure including (for example, see Patent Document 1 below).

In addition, as a related technology, specifically, for example, cable pits are used to lay cables between indoor electrical equipment installed in a building and outdoor equipment, or between the outdoor equipment. The pit is equipped with a side gutter in which the cable is laid, a lid that closes the opening of the side gutter, and a fire spread prevention plate that has a through hole that allows the cable to pass through in a tight state. There is a technology related to a protection structure for a cable in a pit that is divided into sections (for example, see Patent Document 2 below).

JP2018-88785A Japanese Patent Application Publication No. 2007-159246

However, even if the existing cable pit is raised to form a weir, the cable will not be able to cross the weir because the cable length is insufficient. Increasing the length of already installed cables requires a lot of effort and expense. Therefore, there was a problem in that it was difficult to simply raise the height of the conventional cable pit and create a weir.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems with the prior art, it is an object of the present invention to easily and inexpensively prevent water from entering a facility building from an external cable pit.

In order to solve the above-mentioned problems and achieve the purpose, a cable pit improvement method according to the present invention includes a substantially linear first groove provided outside a building of a facility, and a first groove provided between the building of the facility and the first groove. and a substantially linear second groove connecting the two grooves, the first groove and the second groove forming a predetermined angle at a first position where the first groove and the second groove touch, and the cable , in improving a cable pit laid in the first groove and the second groove so as to be bent at the first position, a second position of the first groove is separated from the first position by a predetermined distance; and a third position separated by a predetermined distance from the first position of the second groove, a substantially linear third groove having a higher bottom than the first groove is provided, It is characterized by filling the space between the first position and the third position.

Moreover, the cable pit improvement method according to the present invention is characterized in that, in the above invention, the cable is laid from the first groove to the second groove via the third groove.

Further, in the cable pit improvement method according to the invention, in the above invention, a cable pit having a predetermined height is provided to form a third groove at both ends of the third groove from the second position to the third position. It is characterized by having one wall section.

Further, in the cable pit improvement method according to the invention, in the above invention, a second wall portion having a predetermined height is provided at both ends of the second groove portion between the third position and the building of the facility. Features.

Further, in the cable pit improvement method according to the present invention, in the above invention, a third wall portion connecting the first wall portion and the second wall portion is provided, and the third wall portion allows the cable pit to be fixed in the second groove portion. , filling the space between the first position and the third position.

Further, in the cable pit improvement method according to the invention, in the above invention, a fourth wall of a predetermined height is provided at one end of the first groove near the second position opposite to the one end in contact with the third groove. It is characterized by having a section.

Moreover, in the cable pit improvement method according to the present invention, in the above invention, on the first wall, the second wall, the third wall, and the fourth wall, the first wall, the It is characterized by providing a lid member that covers the second wall, the third wall, and the fourth wall.

According to the cable pit improvement method according to the present invention, it is possible to easily and inexpensively prevent water from entering the facility building from an external cable pit.

It is an explanatory view showing an example of the state of the cable pit before improvement in the cable pit improvement method of the embodiment concerning this invention. It is an explanatory view showing another example of the state of the cable pit before improvement in the cable pit improvement method of the embodiment concerning this invention. It is an explanatory view showing another example of the state of the cable pit before improvement in the cable pit improvement method of the embodiment concerning this invention. It is an explanatory view showing an example of the state of the cable pit after improvement in the cable pit improvement method of the embodiment concerning this invention. It is an explanatory view showing another example of the state of the cable pit after improvement in the cable pit improvement method of the embodiment according to the present invention. It is an explanatory view showing another example of the state of the cable pit after improvement in the cable pit improvement method of the embodiment according to the present invention. It is an explanatory view showing another example of the state of the cable pit after improvement in the cable pit improvement method of the embodiment according to the present invention. It is an explanatory view showing another example of the state of the cable pit after improvement in the cable pit improvement method of the embodiment according to the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the cable pit improvement method according to the present invention will be described in detail below with reference to the accompanying drawings.

(Contents of cable pit improvement method)
First, in the cable pit improvement method according to the embodiment of the present invention, an outline of the cable pit before improvement will be explained. FIG. 1 is an explanatory diagram showing an example of the state of a cable pit before improvement in a cable pit improvement method according to an embodiment of the present invention. FIG. 1 is a view of the appearance of a cable pit in a normal usage state, viewed from the top to the bottom in the vertical direction. FIG. 2A is an explanatory diagram showing another example of the state of the cable pit before improvement in the cable pit improvement method according to the embodiment of the present invention. Similar to FIG. 1, FIG. 2A(a) is a view of the appearance of the cable pit viewed from the top to the bottom in the vertical direction, and shows a state in which the lid member 150 has been removed in FIG. , the description of the cable 160 is omitted. Further, FIG. 2A(b) shows the state of the side wall surface of the first groove portion 101 when the line Xa-Xa is viewed from the arrow A direction in a substantially horizontal direction in FIG. 2A(a). FIG. 2B is an explanatory diagram showing another example of the state of the cable pit before improvement in the cable pit improvement method according to the embodiment of the present invention. Similarly to FIGS. 1 and 2A(a), FIG. 2B is also a view of the appearance of the cable pit viewed from the top to the bottom in the vertical direction. FIG. 2B shows a state in which the lid member 150 is removed in FIG. 1, and a cable 160 is laid in the cable pit.

In FIG. 1, FIG. 2A, and FIG. 2B, the reference numeral 100 is a facility building, and the reference numeral 100a is a wall surface (cable inlet) of the facility building 100. Reference numeral 101 is a first groove, and reference numeral 101a is a side wall surface of the first groove 101. Reference numeral 102 is a second groove. Reference numeral 111 is the first position. Reference numeral 150 is a lid member. Reference numeral 160 is a cable. Reference numeral 170 indicates the bottom of the first groove. Reference numeral 180 indicates the upper part of the first groove. In each figure, the same reference numerals indicate the same components. This also applies to FIGS. 3A, 3B, 4, 5, and 6.

As shown in FIG. 2A(a), the cable pit before improvement has a substantially linear first groove 101 provided outside the facility building 100 and a substantially linear first groove 101 connecting the facility building 100 and the first groove 101. It has a linear second groove part 102. The first groove portion 101 and the second groove portion 102 form a predetermined angle (approximately a right angle (approximately 90 degrees) in FIG. 2A(a)) at a first position 111 where the first groove portion 101 and the second groove portion 102 touch. ing. Further, as shown in FIG. 2A(b), the side wall surface 101a of the first groove portion 101 has a depth from the bottom portion 170 to the top portion 180. Further, near the first position 111, the wall surface 100a of the facility building 100 is visible through the second groove portion 102. The wall surface 100a of the facility building 100 may be a cable entry port for taking the cable 160 into the facility building 100. In a normally operated cable pit, when the cover member 150 in FIG. 1 is removed, the cable 160 is bent into the first groove 101 and the second groove 102 at the first position 111, as shown in FIG. 2B. It is laid out like this. The cable 160 passes through the second groove 102 and is taken into (the cable pit of) the building 100 of the facility. In this state, both the depth of the first groove part 101 and the depth of the second groove part 102 are at the position of the bottom part 170, so rainwater accumulates due to rainfall. If drainage work is not performed, rainwater may pass through the second groove 102 and flood into the building 100 of the facility.

Next, in the cable pit improvement method according to the embodiment of the present invention, an outline of the improved cable pit will be explained. FIG. 3A is an explanatory diagram showing an example of the state of the cable pit after improvement in the cable pit improvement method according to the embodiment of the present invention. Similar to FIGS. 1, 2A(a), and 2B, FIG. 3A(a) is a view of the appearance of the cable pit viewed from the top to the bottom in the vertical direction, and the illustration of the cable 160 is omitted. There is. Further, FIG. 3A(b) shows the state of the side wall surface of the first groove portion 101 when the line Xb-Xb is viewed from the arrow B direction in a substantially horizontal direction in FIG. 3A(a). Further, FIG. 3A(c) shows the state of the side surface of the fourth wall portion 124 of the first groove portion 101 when the line Xc-Xc is viewed from the arrow C direction in a substantially horizontal direction in FIG. 3A(a). . FIG. 3B is an explanatory diagram showing another example of the state of the cable pit after improvement in the cable pit improvement method according to the embodiment of the present invention. Similarly to FIGS. 1, 2A(a), 2B, and 3A(a), FIG. 3B is a view of the appearance of the cable pit viewed from the upper side to the lower side in the vertical direction. FIG. 3B shows a situation in which the cable 160 is laid in the cable pit in FIG. 3A(a). FIG. 4 is an explanatory diagram showing another example of the state of the cable pit after improvement in the cable pit improvement method according to the embodiment of the present invention. Similarly to FIGS. 1, 2A(a), 2B, 3A(a), and 3B, FIG. 4 is a view of the appearance of the cable pit viewed from the top to the bottom in the vertical direction. FIG. 4 shows a state in which the lid members 150 and 151 are placed over the first groove portion 101, the second groove portion 102, and the third groove portion 103 in FIG. 3B. FIG. 5 is an explanatory diagram showing another example of the state of the cable pit after improvement in the cable pit improvement method according to the embodiment of the present invention. FIG. 5 is an overhead view of FIG. 3A(a) viewed from a point at a predetermined height in the direction of arrow C. FIG. 6 is an explanatory diagram showing another example of the state of the cable pit after improvement in the cable pit improvement method according to the embodiment of the present invention. FIG. 6 is an overhead view of FIG. 4 viewed from a point at a predetermined height in the direction of arrow D.

In FIGS. 3A, 3B, 4, 5, and 6, reference numeral 103 indicates a third groove. Reference numeral 112 is the second position. Reference numeral 113 is the third position. Reference numeral 121 is a first wall portion, and reference numerals 121a to 121e are side surfaces of the first wall portion 121. Reference numeral 122 is a second wall portion. Reference numeral 123 is a third wall, and reference numeral 123a is a side surface of the third wall 123. Reference numeral 124 is a fourth wall, and reference numeral 124a is a side surface of the fourth wall 124. Reference numeral 151 is a lid member. Reference numeral 152 is an anchor bolt. Reference numeral 190 is the bottom of the third groove. In each figure, the same reference numerals indicate the same components.

As shown in FIG. 3A(a) etc., a position that is a predetermined distance away from the first position 111 of the first groove portion 101 is defined as a second position 112; The position is assumed to be a third position 113. Then, a substantially linear third groove 103 connecting the second position 112 and the third position 113 is provided. This third groove 103 becomes a new cable pit with a shortcut along the diagonal route. As shown in FIG. 3B, by laying the cable 160 in the third groove 103, the cable 160 is bent into the first groove 101 and the second groove 102 at the first position 111 to compensate for the shortcut. The cable length of the cable 160 can be left longer than if the cable 160 is laid in a similar manner. Further, as shown in FIG. 3A(b) and the like, the bottom 190 of the third groove 103 is configured to be higher than the bottom 170 of the first groove 101, that is, to have a shallower depth. In this way, the bottom portion 190 of the third groove portion 103 is raised higher than the bottom portion 170 of the first groove portion 101, and is formed as a weir. In this way, since the cable 160 is laid from the first groove 101 to the second groove 102 via the third groove 103, it is possible to raise the height of the cable pit without having to reline the cable 160. Therefore, unless the water level of the water that has flooded into the first groove section 101 reaches the height of the bottom section 190, water will not flood into the facility building 100 from the third groove section 103.

Further, in the second groove portion 102, a groove portion between the first position 111 and the third position 113 is filled. Specifically, for example, a groove portion between the first position 111 and the third position 113 in the second groove portion 102 may be filled with a third wall portion 123 described later. Thereby, the third wall portion 123 acts as a dam, and can prevent water from entering from the second groove portion 102. In this way, the length of the cable 160 can be maintained without changing the length by raising the bottom part 190 of the third groove part 103, which is the diagonal route, and laying the cable 160 there as a weir, and burying the route before the improvement. You can also cross the weir section of the new diagonal route. This makes it possible to solve the problem of insufficient cable length. Even if the water level in the outdoor cable pit rises due to heavy rain, the cable pit in the facility building can be prevented from flooding.

Further, as shown in FIG. 3A(a), FIG. 3B, FIG. Alternatively, the first wall portion 121 may be provided. As shown in FIG. 3A(a), FIG. 3A(b), FIG. 5, etc., symbols 121a and 121b indicate side surfaces of the first wall portion 121, respectively. Thereby, even if the bottom portion 190 of the third groove portion 103 is raised, a space for laying the cable 160 in the third groove portion 103 can be secured.

Further, second wall portions 122 having a predetermined height may be provided at both ends of the second groove portion 102 between the third position 113 and the facility building 100. The height of the second wall portion 122 is preferably the same as the height of the first wall portion 121. Thereby, the height with respect to the first wall portion 121 can be adjusted, and the lid member 151 can be stably covered.

Further, a third wall portion 123 may be provided that connects the first wall portion 121 and the second wall portion 122. In FIG. 3A(a), FIG. 3A(b), FIG. 5, etc., the reference numeral 123a indicates the side surface of the third wall portion 123. As shown in FIGS. 3A(a), 3A(b), and 5, the third wall portion 123 fills the space between the first position 111 and the third position 113 in the second groove portion 102. You can also do this. Thereby, the third wall portion 123 acts as a dam, and can prevent water from entering from the second groove portion 102.

Further, a fourth wall portion 124 having a predetermined height may be provided at one end of the first groove portion 101 near the second position 112, opposite to the one end in contact with the third groove portion 103. In FIGS. 3A(a), 3A(c), 5, etc., the reference numeral 124a indicates the side surface of the fourth wall portion 124. The height of the fourth wall portion 124 is preferably the same as the height of the first wall portion 121. Thereby, the height with respect to the first wall portion 121 can be adjusted, and the lid member 151 can be stably covered.

Further, as shown in FIG. 6, on the first wall 121, second wall 122, third wall 123, and fourth wall 124, A lid member 151 may be provided to cover the wall portion 123 and the fourth wall portion 124. The lid member 151 is fixed to the first wall 121, the second wall 122, the third wall 123, and the fourth wall 124 using, for example, anchor bolts 152 to prevent the lid member 151 from shifting. It is a good idea to do so. The remaining first groove portions 101 and second groove portions 102 may be provided with cover members 150 as before the improvement. Thereby, the cable 160 installed in the raised third groove portion 103 can be reliably protected.

Furthermore, a small animal intrusion prevention fence may be attached to the wall (cable intake) 100a of the facility building 100 shown in FIGS. 2A(a) and 2A(b). This makes it possible to prevent small animals from entering the building 100 of the facility.

As explained above, the cable pit improvement method according to the embodiment of the present invention includes the substantially linear first groove 101 provided outside the facility building 100, and the connection between the facility building 100 and the first groove 101. The first groove 101 and the second groove 102 form a predetermined angle at a first position 111 where the first groove 101 and the second groove 102 touch, and the cable 160 is installed in the first groove part 101 and the second groove part 102 so as to be bent at the first position 111. A substantially linear third groove 103 with a bottom 170 higher than the first groove 101 is provided, which connects the second position 112 and a third position 113 that is a predetermined distance away from the first position 111 of the second groove 102. Since the space between the first position 111 and the third position 113 in the two groove parts 102 is filled, the new cable pit will be a diagonal route by the third groove part 103. Accordingly, the cable length of the cable 160 can be made redundant. By raising the part of the diagonal route as a weir and laying the cable 160 there, it is possible to cross the weir part of the new diagonal route without changing the length of the cable 160. Thereby, the problem of insufficient cable length can be solved, and even if the water level in the outdoor cable pit rises due to heavy rain, the cable pit in the facility building 100 can be prevented from being flooded.

Furthermore, in the cable pit improvement method according to the embodiment of the present invention, the cable 160 is laid from the first groove part 101 to the second groove part 102 via the third groove part 103, so that the cable pit improvement method does not require relining the cable 160. It is possible to raise the height of the cable pit.

Moreover, the cable pit improvement method of the embodiment according to the present invention includes grooves of a predetermined height that form the third groove portion 103 at both ends of the third groove portion 103 from the second position 112 to the third position 113. Since one wall portion 121 is provided, even if the bottom portion 190 is raised, a space for laying the cable 160 in the third groove portion 103 can be secured.

Furthermore, the cable pit improvement method according to the embodiment of the present invention includes providing second wall portions 122 of a predetermined height at both ends between the third position 113 of the second groove portion 102 and the facility building 100. , the height with respect to the first wall portion 121 can be adjusted, and the lid member 151 can be stably covered.

Further, in the cable pit improvement method according to the embodiment of the present invention, a third wall portion 123 is provided that connects the first wall portion 121 and the second wall portion 122, and the third wall portion 123 connects the second groove portion 102. Since the space between the first position 111 and the third position 113 is filled in, the third wall part 123 acts as a dam and can prevent water from entering from the second groove part 102.

Further, in the cable pit improvement method according to the embodiment of the present invention, a fourth wall of a predetermined height is installed near the second position 112 of the first groove 101 at one end opposite to the one end in contact with the third groove 103. Since the portion 124 is provided, the height relative to the first wall portion 121 can be adjusted, and the lid member 151 can be stably covered.

Further, in the cable pit improvement method of the embodiment according to the present invention, the first wall 121, the second wall 122, the third wall 123, and the fourth wall 124 are Since the lid member 151 that covers the second wall 122, the third wall 123, and the fourth wall 124 is provided, the cable 160 laid in the raised third groove 103 can be reliably protected.

According to the cable pit improvement method according to the present invention, it is possible to easily and inexpensively prevent water from entering the facility building from an external cable pit.

As described above, the cable pit improvement method according to the present invention is useful as a cable pit improvement method for improving a cable pit in which cables are laid, and is particularly useful for preventing water from seeping into a facility building from an external cable pit. suitable for

100 Facility building 100a (Facility building) wall (cable entry)
101 First groove 101a Side wall surface (of the first groove) 102 Second groove 103 Third groove 111 First position 112 Second position 113 Third position 121 First wall 121a to 121e Side wall (of the first wall) 122 Second wall 123 Third wall 123a Side surface (of the third wall) 124 Fourth wall 124a Side surface (of the fourth wall) 150, 151 Cover member 152 Anchor bolt 160 Cable 170 Bottom of the first groove 180 Top of 1st groove 190 Bottom of 3rd groove

Claims (7)

It has a substantially linear first groove provided outside the building of the facility, and a substantially linear second groove that connects the facility building and the first groove, and the first groove and the second groove are provided. The groove portions form a predetermined angle at a first position where the first groove portion and the second groove portion contact, and the cable is laid in the first groove portion and the second groove portion so as to be bent at the first position. In order to improve the cable pit,
A bottom part is lower than the first groove part, which connects a second position of the first groove part that is a predetermined distance away from the first position and a third position of the second groove part that is a predetermined distance away from the first position. A tall substantially straight third groove is provided,
A method for improving a cable pit, comprising filling a gap between the first position and the third position in the second groove. The cable pit improvement method according to claim 1, characterized in that the cable is laid from the first groove to the second groove via the third groove. 3. A first wall portion having a predetermined height and forming the third groove portion is provided at both ends of the third groove portion from the second position to the third position. Cable pit improvement method described. 4. The cable pit improvement method according to claim 3, wherein second walls having a predetermined height are provided at both ends of the second groove between the third position and the building of the facility. a third wall connecting the first wall and the second wall;
5. The cable pit improvement method according to claim 4, wherein the third wall portion fills a space between the first position and the third position in the second groove portion. A fourth wall portion having a predetermined height is provided at a position opposite to the position where the third groove portion is provided, which is near the second position of the first groove portion and is opposite to the one end in contact with the third groove portion. The method for improving a cable pit according to claim 5. On the first wall, the second wall, the third wall, and the fourth wall, the first wall, the second wall, the third wall, and the fourth wall. 7. The cable pit improvement method according to claim 6, further comprising providing a cover member that covers the cable pit.

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