JP6517304B1 - Pipe burial method, burial pipe, and double pipe - Google Patents

Abstract

An object of the present invention is to provide a method of burying a pipe which can improve load-bearing strength while using a resin pipe. A method of burying a resin pipe for passing fuel or gas in underground soil, which connects an underground tank (102) where fuel is stored and a ground side in a fuel filling station. And a step of burying a resin pipe, of which at least the upper half circumference is covered with a metal material, in the underground soil. [Selected figure] Figure 1

Description

  The present invention relates to a method of burying a pipe, a pipe for burial, and a double pipe, for example, underground soil that connects an underground tank (storage tank) of petroleum fuel and a measuring machine (dispenser) which are buried under the fueling station. The present invention relates to a method of burying new or existing piping to be buried therein and piping thereof.

  Underground tanks are buried in fueling stations represented by gas stations. Fuel oil is stored in the underground tank after receiving (lubricating) fuel oil such as gasoline, light oil and kerosene from a tanker lorry. Then, each weighing machine connected by piping from the underground tank sucks up the fuel oil stored in the underground tank using a fuel outflow pump in the weighing machine, and supplies the sucked fuel oil to the vehicle.

  In such equipment, resin piping has conventionally been used for piping buried in underground soil that transports fuel oil from an underground tank to a weighing machine in order to reduce corrosion due to soil and / or groundwater. In addition, it is desirable to replace the steel piping already buried in the fueling station with resin piping, for example, at the time of replacement due to aging. However, when plastic piping has a lower load-bearing strength than metal piping, and load from the ground is transmitted to the pipe via soil in the ground, the rule is revised as there is a problem in the load-bearing strength. Installation made it difficult within 300mm. Therefore, for replacement of steel piping already buried at a fueling station, for example, piping due to aging, it was necessary to construct by original steel piping instead of resin piping. Also, in the case where a new pipe is embedded in a fueling station, it has been necessary to similarly install by using a steel pipe. Furthermore, for resin piping that was already buried in many fueling stations, it was necessary to replace steel piping including a portion deeper than 300 mm underground or to restructure it deeper than 300 mm underground. . Further, as described above, steel piping has a problem in corrosion resistance as compared with resin piping. Therefore, resin piping is desirable for transportation of fuel oil. In addition, in case of re-construction deeper than 300 mm under the ground while maintaining the predetermined piping slope, the installation depth of the underground tank itself must be increased by that amount, and the construction which is even more extensive than pipe replacement There was a problem that cost became necessary.

  Here, there is also an example in which a double pipe in which the outside in contact with the ground or the outside air is made of a synthetic resin and the inside of which the fuel is transported is an iron pipe is adopted (see, for example, Patent Document 1). However, inserting an iron pipe into the inside of a resin pipe which is already buried and to which fuel is transported is difficult to adopt because it narrows the inner diameter of the pipe which can be used for fuel transportation. In addition, there is a risk that the piping may be cracked during the insertion work. Furthermore, there is a risk that impurities such as particles due to sliding generated inside the pipe during the insertion work may be mixed into the fuel oil.

JP, 2001-082700, A

  Therefore, one aspect of the present invention provides a method of burying a pipe, a buried pipe, and a double pipe, which can improve load resistance strength while using resin pipes.

The pipe burying method according to one aspect of the present invention is
In the method of burying a resin pipe for passing the fuel or gas in the underground soil, which connects the underground tank where fuel is stored in the fueling station and the ground side,
Covering at least the upper half of the resin piping with a metal material with respect to the first portion embedded within 300 mm of the ground of the resin piping;
Embedding resin piping, at least the upper half of which is covered with a metal material, in underground soil;
Equipped with
The resin pipe has a feature that the first portion covered with the metal material and the second portion not covered with the metal material buried deeper in the ground than the first portion. I assume.

  Further, it is preferable that the resin pipe be configured to connect the underground tank and the weighing machine that supplies the fuel to the vehicle.

  Alternatively, it is preferable that the resin pipe be configured to connect the underground tank and the vent.

  Alternatively, it is preferable that the resin pipe be configured to connect the underground tank and the oil inlet for fueling the fuel from the ground.

  In addition, it is preferable that the resin pipe be configured such that at least the upper half circumference of the portion embedded in the ground within 300 mm is covered with a metal material.

In addition, the metal material is formed in a tubular shape,
It is preferable that the resin pipe be disposed inside the cylindrical metal material.

Alternatively, the metal material is formed as a pair of half members in which the cylindrical member is radially divided in half,
The resin pipe is preferably disposed so as to be sandwiched from the outside by the pair of half members.

The piping for burial of one aspect of the present invention is
An underground pipe that connects an underground tank where fuel is stored at a fueling station to the ground side, and is buried in underground soil to pass the fuel or gas,
Plastic piping,
A metal member covering at least the upper half circumference of the resin pipe with respect to the first portion embedded within 300 mm in the ground of the resin pipe;
Equipped with
The resin pipe has a first portion covered with the metal member and a second portion not covered with the metal member buried deeper than the first portion. I assume.

The double tube of one embodiment of the present invention is
A double pipe which is connected to the ground side where the fuel is stored at the fueling station and the ground side, and which is buried in the underground soil to pass the fuel or gas,
With metal piping,
Resin piping disposed inside metal piping for the first portion embedded within 300 mm in the ground ;
Equipped with
The resin pipe has the first portion disposed inside the metal pipe and a second portion not disposed inside the metal pipe buried deeper than the first portion. It is characterized by

Also, the double tube of another embodiment of the present invention is
A double pipe which is connected to the ground side where the fuel is stored at the fueling station and the ground side, and which is buried in the underground soil to pass the fuel or gas,
A pair of halved members formed by using a metal material, the cylindrical members being halved in the radial direction;
The first portion embedded within 300 mm in the ground, resin piping disposed so as to be sandwiched from the outside by a pair of half members;
Equipped with
The resin pipe is not pinched from the outside by the first portion sandwiched from the outside by the pair of half members and the pair of half members embedded deeper in the ground than the first portion. And a second portion .

  According to one aspect of the present invention, load-bearing strength can be improved while using resin piping. Therefore, when newly burying piping and replacing existing steel piping, resin piping excellent in corrosion resistance can be used for transportation of fuel oil, securing sufficient load resistance intensity. Furthermore, when using resin piping already buried at a fueling station, it is possible to eliminate the need to replace steel piping including portions deeper than 300 mm underground and to work deeper than 300 mm underground. It is also possible to eliminate the need to do it again.

FIG. 1 is an example of a cross-sectional view showing a configuration of a fueling station in Embodiment 1. FIG. 7 is a flowchart showing essential processes in a direction in which the pipes are buried in the first embodiment. FIG. 7 is a diagram showing an example of an installation state of the underground underground piping in the first embodiment. FIG. 5 is a cross-sectional view showing an example of a resin pipe covered with a metal material in Embodiment 1; FIG. 7 is a cross-sectional view showing another example of the resin-made piping covered with the metal material in the first embodiment. FIG. 7 is a cross-sectional view showing another example of the resin-made piping covered with the metal material in the first embodiment. FIG. 7 is a cross-sectional view showing another example of the resin-made piping covered with the metal material in the first embodiment. FIG. 14 is a cross-sectional view showing an example of a resin pipe covered with a metal material in the second embodiment. FIG. 21 is a cross-sectional view showing another example of the resin-made piping covered with the metal material in the second embodiment.

Embodiment 1
FIG. 1 is an example of a cross-sectional view showing the configuration of a fueling station according to the first embodiment. In FIG. 1, an underground tank 102 in which fuel is stored is buried underground (in the ground) at a fueling station represented by a gas station. On the other hand, the weighing machine 104 is disposed on the ground. Further, on the ground, an oil supply port 106 for receiving the injection of the fuel oil from the tank truck 302 is disposed. Further, on the ground, there is disposed a vent 108 in which a release valve is disposed, which releases vaporized gas for pressure control when the pressure in the underground tank 102 exceeds a predetermined value. The vent 108 also has a function of sucking in the outside air (air) when the fuel oil 101 in the underground tank 102 decreases due to the fuel supply to the vehicle, and discharges the air when the temperature in the underground tank 102 is expanded. There is also a function. Then, a pipe connecting the underground tank 102 and the ground side and passing fuel or gas is buried in the underground soil. Specifically, the underground tank 102 and the weighing machine 104 are connected by a pipe 112. The underground tank 102 and the oil supply port 106 are connected by a pipe 114. The underground tank 102 and the vent 108 are connected by a pipe 116. Such piping 112, 114, 116 (an example of a buried piping) is buried in the underground soil.

  In addition to gas stations (GS) (or SS: service stations) that sell fuel oil such as gasoline, light oil, and kerosene to fueling stations, transportation companies etc. use it for their own business. Also included are refueling facilities that supply fuel oil to vehicles (such as taxis, buses, or trucks), ships, railways, and aviation refueling facilities. The fuel oil referred to here may also contain liquefied natural gas, liquefied hydrogen and the like.

  When the tanker lorry 302 arrives at the fueling station, the piping of the tank lorry 302 is connected to the oil inlet 106. Thereafter, the fuel oil carried by the tank truck 302 flows through the pipe 114 and is injected into the underground tank 102.

  The weighing machine 104 disposed on the ground pours out (fuels) the fuel oil 101 stored in the underground tank 102 via the pipe 112 to the vehicle 300. For example, the fuel oil 101 stored in the underground tank 102 is transferred by a pump (not shown) disposed in the weighing machine 104.

  Here, these pipes 112, 114, 116 are connected by pipes and piping joints extending from the underground tank 102 in the underground pit 10 buried underground to check the underground tank 102. The pipe 112 is connected by a pipe and a pipe joint extending from the weighing machine 104 in an underground pit 122 buried underground below the weighing machine 104. The pipe 114 is connected by a pipe and a pipe joint extending from the oil inlet 106 in an underground pit 124 buried underground below the oil inlet 106. The pipe 116 is connected by a pipe and a pipe joint extending from the vent 108 in an underground pit 126 buried underground below the vent 108. In FIG. 1, the pipe 116 is not illustrated because it has a portion overlapping with the pipe 114. The pipe 116 may be connected to a pipe extending from the underground tank 102 independently of the pipes 112 and 114.

  The pipes 112 and 114 are buried in the underground soil to feed the fuel oil 101 from the underground tank 102 where the fuel oil 101 is stored at the fueling station or to the underground tank 102. Moreover, the piping 116 is buried in the underground soil in order to send the gas which fuel vaporized from the underground tank 102 in which the fuel in the fueling place was stored. The underground pit 122 immediately below the weighing machine 104 has a shallow burial depth, so the pipe 112 is buried in the soil so as to pass through the underground depth D (for example, 300 mm in the underground). Similarly, the underground pit 124 immediately below the oil filler port 106 has a shallow burial depth, so the pipe 114 is buried in the soil so as to pass through the underground depth D. Similarly, the underground pit 126 immediately below the air vent 108 has a shallow burial depth, so the pipe 116 is buried in the soil so as to pass through the underground depth D.

  Here, as described above, resin underground piping has conventionally been used for underground underground piping in order to reduce corrosion due to soil and / or ground water. However, when plastic piping has a lower load-bearing strength than metal piping, and load from the ground is transmitted to the pipe via soil in the ground, the rule is revised as there is a problem in the load-bearing strength. Installation made it difficult within 300mm. For this reason, it has been necessary to replace the resin piping already buried in many fueling stations with steel piping including a portion deeper than 300 mm underground, or to rework it deeper than 300 mm underground. Alternatively, when piping was newly buried at the fueling station, it was necessary to use steel piping. Alternatively, with regard to replacement of already-embedded steel piping, for example, piping associated with aging, it was necessary to re-embed the same steel piping again. Therefore, in the first embodiment, the load-bearing strength of the pipe is improved by using a resin pipe.

  FIG. 2 is a flow chart showing principal processes in the piping embedding direction in the first embodiment. In FIG. 2, in the piping burying method in the first embodiment, a series of processes including a pipe digging process (S102), a metal pipe installation process (S104), and a pipe burying process (S106) are performed.

  In the pipe digging step (S102), the ground is dug up so that the pipes 112, 114, 116 buried in the ground and in a state where the metal pipe is not installed yet are exposed. In FIG. 2, the case where resin piping already embedded is utilized is demonstrated. However, the present invention is not limited to this, and in the case of newly laying a pipe, in the pipe digging step (S102), the ground is dug up to a depth where the pipe can be buried. Alternatively, for replacement of already-embedded steel piping, for example, piping due to aging, the ground is dug so that the steel piping buried in the ground is exposed. Then remove the steel pipe.

  In the metal pipe installation step (S104), the outer periphery of the resin pipe is covered with a metal material.

  FIG. 3 is a diagram showing an example of the installation state of the underground underground piping in the first embodiment. In the example of FIG. 3, a portion of the pipe 112 extending from the underground pit 122 immediately below the weighing machine 104 to the underground pit 10 on the underground tank 102 buried further in a predetermined gradient (for example, 1/100) Is shown. The pipe 112 has a double pipe structure of an inner resin pipe 14 and a metal pipe 12 (an example of a metal material) disposed outside the resin pipe 14. Here, the existing resin pipe 14 is covered by the metal pipe 12. The metal pipe 12 is fixed by the wall surface of the underground pit 122 and the flange 16. Similarly, the underground pit 10 side above the underground tank 102 may be fixed by the wall surface of the underground pit 10 and a flange (not shown). Therefore, the resin piping 14 of the piping 112 is installed as piping which connects the underground tank 102 and the weighing machine 104 which supplies a fuel to a vehicle. In areas deeper than the underground depth D (for example, 300 mm in the ground), load from the ground is dispersed and transmitted by soil or the like, so there is no problem in strength even if the resin pipe 14 itself receives the load. . Therefore, as shown in FIG. 3, the resin pipe 14 is formed by the metal pipe 12 so that the resin pipe 14 itself does not receive a load from above directly at least within the underground depth D (for example, 300 mm underground). It should be overturned. Therefore, as shown in FIG. 1, the entire resin pipe 14 embedded in the ground may be covered with the metal pipe 12 including a portion deeper than the underground depth D (for example, 300 mm in the underground) Alternatively, as shown in FIG. 3, only a portion within the underground depth D (for example, 300 mm underground) of the resin pipe 14 may be covered with the metal pipe 12. As a material of resin piping 14, synthetic resin, such as FRP (fiber reinforced plastic) or polyethylene, is used, for example. As a material of the metal pipe 12, for example, steel which is an alloy mainly composed of iron is used.

  The configuration shown in FIG. 3 is similarly applied to the pipe 114 extending from the underground pit 124 to the underground pit 10 on the underground tank 102 buried further deeply with a predetermined gradient (for example, 1/100). Therefore, the resin pipe 14 of the pipe 114 is installed as a pipe that connects the underground tank 102 and the oil inlet 106 for lubricating the fuel from the ground. The resin pipe 14 of the pipe 114 is covered with the metal pipe 12. Also, the configuration shown in FIG. 3 is the same for the pipe 116 extending from the underground pit 126 to the underground pit 10 on the underground tank 102 buried further deeper. Therefore, the resin pipe 14 of the pipe 116 is installed as a pipe that connects the underground tank 102 and the vent 108. The resin pipe 14 of the pipe 116 is covered with the metal pipe 12.

  FIG. 4 is a cross-sectional view showing an example of a resin pipe covered with a metal material according to the first embodiment. In the example of FIG. 4, the case where the resin pipe 14 having a circular cross section in the pipe 112 (or / and the pipe 114 or / and the pipe 116) is similarly covered with the metal pipe 12 having a circular cross section is shown. There is.

  FIG. 5 is a cross-sectional view showing another example of the resin-made piping covered with the metal material in the first embodiment. The example of FIG. 5 shows the case where the resin pipe 14 having a circular cross section in the pipe 112 (or / and the pipe 114 or / and the pipe 116) is covered with the metal pipe 11 having a rectangular cross section. .

As described above, in the first embodiment, as shown in FIGS. 4 and 5, the fuel oil 101 is supplied from the underground tank 102 (underground tank) in which the fuel is stored at the fueling station (or to the underground tank 102). The pipe 112 (or / and the pipe 114 or / and the pipe 116) buried in the underground soil may be a double pipe as described above. In other words, the double pipe may be provided with the metal pipes 11 and 12 and the resin pipe 14 disposed inside the metal pipes 11 and 12.

  In the example of FIG. 4 and FIG. 5, the resin pipe 14 is made into the metal pipe 11 (or 12) so that the resin pipe 14 is disposed inside the metal pipe 11, 12 (metal material) formed in a cylindrical shape. Installation work is carried out by inserting it inside the sheath (shedding method). The installation method of metal piping is not limited to this.

  FIG. 6 is a cross-sectional view showing another example of the resin-made piping covered with the metal material in the first embodiment. In the example of FIG. 6, a pair of resin pipes 14 having a circular cross section in the pipe 112 (or / and the pipe 114 or / and the pipe 116) is a pair of cylindrical members having a circular cross section in the radial direction. It is arrange | positioned so that it may be pinched from the outer side by the half members 13 and 15 of this. Thus, the metal pipe 12 (metal material) is formed as a pair of half members 13 and 15 in which the cylindrical member is divided in half in the radial direction, for example, sandwiching the resin pipe 14 from above and below The half members 13 and 15 are fixed to each other. Thus, by using the existing resin pipe 14 by sandwiching it from the outside with the pair of half members 13 and 15, the covering work can be performed without removing the existing resin pipe 14.

  FIG. 7 is a cross-sectional view showing another example of the resin-made piping covered with the metal material in the first embodiment. In the example of FIG. 7, a pair of resin pipes 14 having a circular cross section in the pipe 112 (or / and the pipe 114 or / and the pipe 116) is a pair of cylindrical members having a rectangular cross section in the radial direction. It arrange | positions so that it may be pinched from the outer side by the half members 17 and 19 of this. Thus, the metal pipe 11 (metal material) is formed as a pair of half members 17 and 19 obtained by dividing the cylindrical member in the radial direction, and for example, sandwiching the resin pipe 14 from above and below, the flange portion The half members 17, 19 are fixed to each other. Thus, by using the existing resin pipe 14 by sandwiching it from the outside with the pair of half members 17 and 19, the covering work can be performed without removing the existing resin pipe 14.

  As described above, in the first embodiment, as shown in FIGS. 6 and 7, the underground fuel tank 102 is used to send fuel oil 101 from (or to) the underground tank 102 in which fuel is stored at the fueling station. The pipe 112 (or / and / or the pipe 114 or / and the pipe 116) embedded in the earth may be a double pipe as described above. In other words, a pair of half members 13 and 15 (or 17, 19) formed by using a metal material, the cylindrical members being divided in the radial direction, and the pair of half members 13 and 15 The double pipe may be provided with a resin pipe 14 disposed so as to be sandwiched from the outside by (or 17, 19).

  In the pipe burying step (S106), the resin pipe 14 covered with a metal material is buried in the underground soil. Specifically, the pipes 112, 114, and 116, which have become double pipes, are buried in the underground soil.

  Here, since the metal material is exposed in the soil, corrosion by the soil or the like becomes a problem, but even if pinholes or the like due to the corrosion are formed in the metal pipes 11, 12 on the outer peripheral side, the resin pipe 14 is formed inside. As a result, corrosion can be prevented from advancing to the passage through which the fuel oil passes. Furthermore, in a state in which the conventional resin pipe 14 is exposed, if the resin is in close contact with the concrete material at a shallow position in the ground, the resin pipe 14 may be melted due to the strong alkali action. At a shallow position in the ground, the outer side becomes the metal pipe 11, 12 having high alkali resistance, so it is hard to be corroded even when in close contact with the concrete material. Therefore, the occurrence of corrosion due to close contact with the concrete material can be suppressed.

  As described above, according to the first embodiment, since the outer peripheral side of the resin pipe 14 is covered with the metal material, it is sufficient even when the load from the ground is transmitted to the pipe via the soil or the like in the ground. It can exhibit load-bearing strength. Therefore, when newly burying piping and replacing existing steel piping, resin piping excellent in corrosion resistance can be used for transportation of fuel oil, securing sufficient load bearing strength.

  Furthermore, according to the first embodiment, it is possible to improve the load bearing strength while using the resin pipe 14 which is already buried and to which the fuel is transported. Therefore, it is possible to eliminate the need to replace the resin pipe 14 with a steel pipe including a portion deeper than 300 mm in the ground and replace it with a steel pipe, and also to eliminate the need to remake the pipe 14 deeper than 300 mm in the ground.

Second Embodiment
Although Embodiment 1 demonstrated the case where the whole outer periphery of resin piping 14 was covered with a metal material, it does not restrict to this. The load from the ground is dispersed by soil or the like and transmitted from above to the pipe 112 (or / and the pipe 114 or / and the pipe 116). Therefore, the load-bearing strength of at least the upper half portion may be improved. Therefore, at least the upper half of the resin pipe 14 may be covered with a metal material. So, in Embodiment 2, the case where the upper half of resin piping 14 is covered with a metal material is explained. In the second embodiment, an example of a cross-sectional view showing a configuration of a fueling station is the same as that shown in FIG. Moreover, the flowchart figure which shows the principal part process of the piping embedding direction in Embodiment 2 is the same as that of FIG. The contents other than the points specifically described below are the same as in the first embodiment.

  In the metal pipe installation step (S104), the upper half of the resin pipe 14 is covered with a metal material.

  FIG. 8 is a cross-sectional view showing an example of a resin pipe covered with a metal material in the second embodiment. In the example of FIG. 8, the resin pipe 14 having a circular cross section in the pipe 112 (or / and the pipe 114 or / and the pipe 116) (another example of the embedded pipe) has a diameter of a cylindrical member having a circular cross section. The upper half is covered so as to be covered by the half member 13 half divided in the direction. As described above, the load-bearing strength of at least the upper half portion may be improved. Therefore, as shown in FIG. 8, by arranging the half member 13 to be placed on the upper half circumference of the resin pipe 14, the pipe 112 (or / and the pipe 114 or / and the pipe 116) is viewed from above. Load bearing strength can be improved. In addition, as shown to the example of FIG. 8, it may be arrange | positioned so that the half member 13 and the resin piping 14 may contact, and a clearance may be opened and it may be arrange | positioned.

  FIG. 9 is a cross-sectional view showing another example of the resin pipe lined with the metal material in the second embodiment. In the example of FIG. 9, the resin pipe 14 having a circular cross section in the pipe 112 (or / and the pipe 114 or / and the pipe 116) (another example of the embedded pipe) has a diameter of a cylindrical member having a rectangular cross section. The upper half is covered so as to be covered by the half member 17 which is half in the direction. As described above, the load-bearing strength of at least the upper half portion may be improved. Therefore, as shown in FIG. 9, by arranging the half member 17 to be placed on the upper half circumference of the resin pipe 14, the pipe 112 (or / and the pipe 114 or / and the pipe 116) is viewed from above. Load bearing strength can be improved. In addition, as shown to the example of FIG. 9, it may be arrange | positioned so that the half member 17 and the resin piping 14 may contact, and a clearance may be opened and it may be arrange | positioned.

  Further, as described above, since the load from the ground is dispersed and transmitted by soil or the like in a portion deeper than the underground depth D (for example, 300 mm in the underground), the resin pipe 14 itself receives the load and There is no problem in strength too. Therefore, as shown in FIG. 3, the resin is cut by the half member 13 (17) so that the resin pipe 14 itself does not directly receive the load from above within the underground depth D (for example, 300 mm underground). The upper part of the pipe 14 may be covered.

  As described above, according to the second embodiment, since the upper half circumference of the resin pipe 14 is covered with the metal material, sufficient load can be transmitted to the pipe via the soil or the like in the ground. It can exhibit load-bearing strength. In addition, since only the upper half of the circumference is covered, covering work can be performed without removing the existing resin pipe 14. Further, in the second embodiment, since the upper half of the resin pipe 14 is covered with the metal material, the metal material having high alkali resistance adheres even when in close contact with the concrete material disposed at the boundary with the ground or at a shallow position in the ground. Do. Therefore, the occurrence of corrosion due to close contact with the concrete material can be suppressed. Therefore, when newly burying piping and replacing existing steel piping, resin piping excellent in corrosion resistance can be used for transportation of fuel oil, securing sufficient load bearing strength.

  Furthermore, according to the second embodiment, the load-bearing strength can be improved while using the resin pipe 14. Therefore, when using resin piping already buried in a fueling station, it is possible to eliminate the need to replace steel piping including a portion of 300 mm or less deep in the ground and to work deeper than 300 mm underground. It is also possible to eliminate the need to do it again.

  The embodiments have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In the example mentioned above, although the case where a metal material was lined up in existing resin piping 14 was explained, it is not restricted to this, and it is applicable also when burying piping newly.

  Besides, all the piping embedding methods, the piping for embedding, and the double pipe which are equipped with the elements of the present invention and whose design can be appropriately changed by those skilled in the art are included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 underground pit 11,12 metal piping 13,15,17,19 half-divided member 14 resin piping 101 fuel oil 102 underground tank 104 weighing machine 106 oil filler hole 108 vent 112,114,116 piping 122,124,126 underground pit 300 vehicles 302 tanker cars

Claims (9)

In the method of burying a resin pipe for passing the fuel or gas in the underground soil, which connects the underground tank where fuel is stored in the fueling station and the ground side,
Covering at least an upper half portion of the resin pipe with a metal material with respect to a first portion embedded within 300 mm of the ground of the resin pipe;
Embedding the resin pipe, of which at least the upper half circumference is covered with the metal material, in underground soil;
Equipped with
The resin pipe has a feature that the first portion covered with the metal material and the second portion not covered with the metal material buried deeper in the ground than the first portion. How to bury piping.   The piping embedding method according to claim 1, wherein the resin pipe connects the underground tank and a weighing machine which supplies fuel to a vehicle.   The said resin-made piping connects the said underground tank and a vent, The piping burying method of Claim 1 characterized by the above-mentioned.   The piping burying method according to claim 1, wherein the resin pipe connects the underground tank and an oil inlet for lubricating the fuel from the ground. The metal material is formed in a tubular shape,
The said resin-made piping is arrange | positioned inside the said cylindrical metal material, The piping embedding method in any one of the Claims 1-4 characterized by the above-mentioned. The metal material is formed as a pair of half members in which a cylindrical member is divided in a radial direction,
The said resin-made piping is arrange | positioned so that it may be pinched | interposed from the outer side by the said pair of half-divided members, The piping embedding method in any one of the Claims 1-4 characterized by the above-mentioned. An underground pipe that connects an underground tank where fuel is stored at a fueling station to the ground side, and is buried in underground soil to pass the fuel or gas,
Plastic piping,
A metal member covering at least the upper half of the resin pipe with respect to a first portion embedded within 300 mm of the pipe made of resin ;
Equipped with
The resin pipe has a first portion covered with the metal member and a second portion not covered with the metal member buried deeper than the first portion. Buried piping. A double pipe which is connected to the ground side where the fuel is stored at the fueling station and the ground side, and which is buried in the underground soil to pass the fuel or gas,
With metal piping,
Resin piping disposed inside the metal piping for the first portion embedded within 300 mm in the ground ;
Equipped with
The resin pipe has the first portion disposed inside the metal pipe and a second portion not disposed inside the metal pipe buried deeper than the first portion. Double tube characterized by A double pipe which is connected to the ground side where the fuel is stored at the fueling station and the ground side, and which is buried in the underground soil to pass the fuel or gas,
A pair of halved members formed by using a metal material, the cylindrical members being halved in the radial direction;
Resin piping disposed so as to be sandwiched from the outside by the pair of half members for the first portion embedded within 300 mm in the ground ;
Equipped with
The resin pipe is not pinched from the outside by the first portion sandwiched from the outside by the pair of half members and the pair of half members embedded deeper in the ground than the first portion. A double pipe having a second portion .

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