JP2008296946A - Manhole apparatus for underground tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the top part of an underground tank from being damaged by a manhole apparatus mounted on the underground tank. <P>SOLUTION: The manhole apparatus 10 is directly fitted on a fitting part 30 made of a resin such as an FRP or the like on the top part of the underground tank 20, and has a box body 50 for storing a plurality of risers 40 of the underground tank 20 and a manhole lid 52 made of steel for closing the upper opening of the box body 50. The fitting part 30 is provided on the top part of an inner hull tank 70 made of steel on which an outer hull tank 80 made of the resin is not formed. In addition, the fitting part 30 has a flat part 32 for directly supporting the undersurface of the box body 50 on its upper face, and an abutting face 33 coming into contact with the whole parts except the risers 40 on the surface of the top part of the underground tank 20 on its undersurface. As the abutting face of the fitting part 30 made of the resin comes into contact with the top part of the inner hull tank 70 made of the steel, the fitting part can be mounted so that the load of the box body 50 does not act to a leakage detecting layer 72. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a manhole device for an underground tank, and more particularly to a manhole device provided at the top of a double-shell underground tank for storing fuel such as oil.

  For example, in an oil supply facility such as a gas station, an underground tank is buried in the site, and the oil liquid delivered by a tank truck is unloaded and stored in the underground tank. This type of underground tank is generally placed on a concrete foundation provided in the ground with the cylindrical tank placed sideways (horizontal), and the upper part is surrounded by earth and sand. It is buried so as to be covered with a concrete layer.

  In recent years, resin piping has been used as piping for unloading and piping for supplying oil from the underground tank to the outside, and a construction method for connecting the resin piping to the rising pipe of the underground tank has been used. The manhole device installed at the top of the underground tank requires a connecting member for connecting the resin pipe to the pipe joint connected to the riser pipe, and the manhole housing tends to be enlarged.

Therefore, when resin piping is used, the manhole device is configured so that a casing larger than that of a structure connecting steel pipes is mounted on the top of the underground tank. It is attached so as not to damage the resin layer formed on the top.
Regarding a manhole mounting structure in an underground tank, for example, there is one described in Patent Document 1. In Patent Document 1, paragraphs 0021 and 0022 describe that a mount for mounting a manhole is configured as follows.
“[0021] As shown in FIG. 2 (a), the gantry 2 is provided on the upper part of the underground tank 10 so as to surround the tank flange portion 10a. As shown in FIG. The lower end of the rectangular tube portion 20 is formed in a shape along the curved surface of the upper portion of the substantially cylindrical underground tank 10. That is, the rectangular tube portion. Of the four sides at the lower end of 20, a pair of sides 21 that are spaced apart and opposed in the axial direction of the underground tank 10 are concentrically curved with the outer peripheral surface of the underground tank 10.
[0022] The gantry 2 is formed of a resin such as FRP, for example, and the lower end of the rectangular tube portion 20 is joined to the upper portion of the underground tank 10. The said joining is performed by adhesion | attachment with the oil-resistant adhesive agent and caulking material which were apply | coated to the lower end of the square cylinder part 20, for example, and the space | interval between the mount frame 2 and the underground tank 10 is sealed. Thereby, it is possible to prevent oil liquid from leaking into the external soil 17 from between the gantry 2 and the underground tank 10 and to prevent moisture, sand particles, mud and the like in the soil 17 from entering. Moreover, compared with welding the mount frame 2 to the underground tank 10, the mounting work of the mount frame 2 becomes remarkably easy. "a.

On the other hand, the underground tank is an SF double shell tank structure in which a resin outer shell tank made of FRP (fiber reinforced plastics) or the like is arranged outside the steel inner shell tank as shown in Patent Document 2, or Patent Document 2 It has an FF double shell tank structure in which a resin outer shell tank is arranged outside the resin inner shell tank as shown. In these double shell underground tanks, as described in Patent Document 3, a leak detection space for leak detection is formed between the inner shell tank and the outer shell tank, and leak detection is performed in this leak detection space. The liquid for injection is injected, and the presence or absence of leakage is detected from the change in the liquid level of the leakage detection liquid.
JP 2005-306429 A Utility Model Registration No. 2577578 Utility Model Registration No. 3022356

  In the conventional manhole device shown in Patent Document 1, since the lower end of the rectangular tube portion 20 of the gantry 2 is formed in a shape along the curved surface of the upper portion of the substantially cylindrical underground tank 10, it takes time to manufacture. It is troublesome.

  Furthermore, in the above-described conventional configuration, the lower end face (thickness of the cylinder part) of the square cylinder part 20 of the gantry 2 is in contact with the tank, so that the pipe sinks due to the ground subsidence of the part surrounding the underground tank, etc. When an external force is applied to the housing, there is a possibility that the resin layer formed on the surface of the underground tank may be damaged due to the concentration of the load on a part of the top of the underground tank.

  Also, in underground tanks with a double-shell tank structure, when the load of the housing acts locally on the detection layer consisting of gaps for leakage detection formed between the inner shell tank and the outer shell tank The volume of the detection layer between the inner shell tank and the outer shell tank changes, and there is a problem that erroneous detection may occur.

  In view of the above circumstances, an object of the present invention is to provide an underground tank manhole device that solves the above-described problems.

  In order to solve the above problems, the present invention has the following means.

The present invention provides a manhole device having a housing that forms a space for accommodating a riser pipe provided at the top of an underground tank, and a lid that closes an upper opening of the housing. The above-mentioned problem is solved by providing a resin mounting portion having a flat portion that directly supports the lower surface of the housing, and providing a fastening member for fastening the housing to the mounting portion.
In the present invention, the mounting portion is applied to the top of the underground tank and has an adhesive property, and at least the lower surface is bonded and fixed to the top of the underground tank by this resin material so that the lower surface of the housing is directly supported. And a plate member having a flat portion to solve the above-mentioned problems.
The present invention is a double-shell tank structure in which the underground tank is formed by a resin outer shell tank, and a detection layer for leakage detection is formed up to a position exceeding the maximum contained liquid level in the steel inner shell tank,
The said subject is solved by providing the said attaching part in the top part of the said steel inner shell tank in which the said resin outer shell tank is not formed.
The present invention solves the above-mentioned problem by including a first support member embedded in an upper concrete layer having a lower end coupled to an upper part or a side part of the casing and an upper end formed above the underground tank. Is.
The present invention provides a manhole device having a housing that forms a space for accommodating a riser pipe provided at the top of an underground tank, and a lid that closes an upper opening of the housing, wherein the underground tank is made of resin. It is a double shell tank structure in which a resin outer shell tank is arranged outside the inner shell tank, and a mounting portion is provided on the top of the resin outer shell tank, and the mounting portion is applied to the top of the underground tank and has adhesive properties. And a plate member having a flat part that directly supports and supports the lower surface of the housing, and at least the lower surface is bonded and fixed to the top of the underground tank by the resin material. The above-described problems are solved by providing a fastening member for fastening the housing.
The present invention includes a plurality of annular ribs protruding at positions spaced apart from each other by a predetermined distance in the longitudinal direction of the outer periphery of the resin outer shell tank, and mounted between the plurality of annular ribs, in contact with a lower portion of the casing. By providing a second support member that receives the load of the housing, the above-described problem is solved.
The present invention solves the above-mentioned problem by including a first support member embedded in an upper concrete layer having a lower end coupled to an upper part or a side part of the casing and an upper end formed above the underground tank. Is.

  According to the present invention, the load of the housing is provided by providing a resin mounting portion having a flat portion that directly supports the lower surface of the housing at the top of the underground tank, and providing a fastening member for fastening the housing to the mounting portion. It is possible to prevent the top of the underground tank from being damaged, and in particular, it is possible to prevent the resin layer formed on the surface of the underground tank from peeling off. Further, in the case of an underground tank having a detection layer for leak detection, it is possible to prevent erroneous detection of leak detection by preventing a change in volume of the detection layer due to a housing load.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of an underground tank manhole apparatus according to the present invention. As shown in FIG. 1, the manhole device 10 is directly attached to the top portion of the underground tank 20 to a resin attachment portion 30 such as FRP, and houses a plurality of risers 40 of the underground tank 20. 50 and a steel manhole cover 52 that closes the upper opening of the housing 50. The plurality of risers 40 form an oil supply path for supplying the fuel in the underground tank 20 to an oil supply device installed on the ground, and unload the fuel from the tank truck to the underground tank 20. Some form an oiling path. In addition to this, although not shown in FIG. 1, a rising pipe for communicating the inside of the underground tank 20 and the ventilation pipe installed on the ground is also provided.
The underground tank 20 has an SF double-shell tank structure in which a leak detection layer 72 for leak detection is formed up to a position where the resin outer shell tank 80 exceeds the maximum liquid level in the steel inner shell tank 70. A resin sheet 82 is coated on the surface of the top portion T of the steel inner shell tank 70 where the resin outer shell tank 80 is not formed and the surface of the resin outer shell tank 80.

  The mounting portion 30 is provided at the top of the steel inner shell tank 70 where the resin outer shell tank 80 is not formed. Further, the mounting portion 30 has a flat portion 32 that directly supports the lower surface of the housing 50 on the upper surface, and an abutting surface 33 that abuts the entire portion excluding the rising pipe 40 on the top surface of the underground tank 20 on the lower surface. Have Further, an adhesive portion 36 in which a resin material is adhered to the outer periphery of the riser tube 40 is raised at the center on the upper surface side of the attachment portion 30. Note that the attachment portion 30 may be provided at a factory where the underground tank 20 is manufactured, or may be provided at the installation site of the underground tank 20.

A resin film is attached to a gap formed between the steel inner shell tank 70 and the resin outer shell tank 80 except for a predetermined range at the top of the underground tank 20. A leakage detection liquid is injected into the formed leakage detection layer 72. And since the leak detection layer 72 is formed so that the predetermined range of the top part of the underground tank 20 may be remove | excluded, the height range in which the leak detection layer 72 was formed is a leak detection area | region, and the leak detection layer 72 is not formed. The top of the underground tank 20 is a close contact area where the mounting portion 30 that supports the housing 50 is in close contact. In the present embodiment, the attachment portion 30 made of resin is attached in close contact with the contact region.
In addition, a liquid level detection unit (not shown in FIG. 1) for detecting the liquid level of the leakage detection liquid injected into the leakage detection layer 72 is provided in the upper part of the underground tank 20. The upper end height of the leakage detection layer 72 is the maximum stored liquid level.

  A pipe joint 90 is connected to the upper part of the riser pipe 40. A horizontal pipe 110 is connected to the pipe joint 90 via a connection member 120 for resin pipe. The horizontal pulling pipe 110 is made of a resin pipe extending in the horizontal direction, and is inserted into the internal space 54 of the casing 50 through a pipe insertion hole 207 provided in the side plate 206 of the lower casing 200. Since the inner diameter of the pipe insertion hole 207 is sufficiently larger than the outer diameter of the horizontal pulling pipe 110, the horizontal pulling pipe 110 is inserted into the pipe insertion hole 207 in a loosely fitted state.

In the case 50, the internal space 54 is expanded in the horizontal direction in comparison with the iron pipe connection structure in consideration of workability when connecting the horizontal pipe 110 to the pipe joint 90. A sediment layer 130 is deposited around the underground tank 20 and the casing 50, and an upper reinforced concrete layer 140 is provided on the upper part of the casing 50. The manhole cover 52 is attached so as to be exposed on the upper surface of the upper reinforced concrete layer 140.
FIG. 2A is a longitudinal sectional view showing the configuration of the attachment portion 30. FIG. 2B is a perspective view showing the configuration of the attachment portion 30. As shown in FIGS. 2 (A) and 2 (B), the attachment portion 30 is formed in a generally trapezoidal shape with a space 38 for inserting the riser tube 40 as a center when viewed from above. Specifically, the fixing portion 31 is formed by applying a resin material having adhesive properties to the top portion of the underground tank and solidified, the flat portion 32 formed on the upper surface of the fixing portion 31, and the lower surface of the fixing portion 31. And an abutment surface 33. A plate member 60 in which a metal plate is formed in a band shape is bonded and fixed to the flat portion 32.

  FIG. 3A to FIG. 3C are diagrams showing the configuration of the plate member 60. As shown in FIGS. 3A to 3C, a plurality of stud bolts 34 are embedded on four sides of a plate member 60 formed in a rectangular frame shape so as to stand up at predetermined intervals. ing. The stud bolt 34 is attached so that the head 34 a is fitted into the recess 32 b of the groove 32 a and the male screw 34 b is inserted through a hole 60 a provided in the plate member 60 and protrudes upward. Further, the head 34 a of the stud bolt 34 is fixed to the plate member 60 by welding 61.

  As shown in FIG. 3D, a nut 53 may be fixed to the lower surface of the plate member 60 by welding 57 instead of the stud bolt 34. In this case, a lid member 55 that prevents the resin material from entering is attached to the lower side of the nut 53. The lid member 55 has a fitting portion 55 a that fits on the outer periphery of the nut 53, and a concave portion 55 a that protrudes downward so that the male screw portion 34 b does not contact when the stud bolt 34 is screwed into the nut 53. Is provided.

  When the nut 53 is provided at the lower end of the plate member 60 as in this example, a through hole may be used instead of the screw hole of the plate member 60. Further, the nut 53 may be omitted and the lid member 55 may be attached, and the plate member 60 may be provided with a screw hole.

  FIG. 4 is a longitudinal sectional view showing a state in which the housing 50 is fixed to the attachment portion 30. As shown in FIG. 4, the attachment portion 30 has a plate member 60 fixed to a flat portion 32 on the upper surface side, and stud bolts 34 are embedded in the plate member 60 at a predetermined interval. Between the plate member 60 and the lower surface of the housing 50, an elastic plate-like rubber packing 62 is interposed.

  The male screw portion 34b of the stud bolt 34 is inserted into the hole 51 on the lower surface of the housing 50 and protrudes into the housing 50, and a nut 53 is screwed into the upper end. When the nut 53 is tightened with a tool such as a spanner, the lower surface of the housing 50 is fixed to the flat portion 32 of the attachment portion 30 via the rubber packing 62.

  As shown in FIG. 5, like the flat portion 32, the plate member 60 is formed in a rectangular frame shape so as to surround the riser 40, and is formed in an L shape by a metal plate. The first plate member 60A and the second plate member 60B are combined. The first plate member 60A and the second plate member 60B have the same shape, and are formed into a frame shape having the same size and shape as the flat portion 32 by being combined.

  Returning to FIG. 1, the riser pipe 40 and the pipe joint 90 housed in the internal space 54 of the housing 50 will be described. The riser pipe 40 is made of steel, the lower end thereof penetrates the top of the steel inner shell tank 70 and communicates with the inside of the underground tank 20, and the upper end has a height from the lower surface of the housing 50 to the upper end flange 42. It is provided to be H1. This height H1 is a minimum height that secures a work space required when the pipe joint 90 is fastened to the upper end flange 42 of the riser pipe 40 with bolts and nuts.

  A pipe joint 90 is fastened to the upper end of each riser pipe 40. In the pipe joint 90, a lower end flange 92 is fastened to the upper end flange 42 of the riser pipe 40, and a lid member 100 is fastened to the upper end flange 94. Further, the pipe joint 90 has a side flange 96 that protrudes laterally (horizontal direction) from the outer periphery. A flange 124 of the connecting member 120 for connecting the horizontal pulling pipe 110 is fastened to the side flange 96.

  The horizontal pipe 110 is embedded in the ground as a horizontal pipe that extends through the side plate of the housing 50 in the horizontal direction. As described above, since the horizontal pipe 110 is connected to the pipe joint 90 via the connection member 120, the internal space 54 of the housing 50 is wider than that of the iron pipe.

  Here, the configuration of the casing 50 will be described. FIG. 6A is a perspective view of the housing 50, and FIG. 6B is a perspective view of the housing 50. As shown in FIGS. 1, 6 </ b> A, and 6 </ b> B, the housing 50 is molded from a resin material and is placed on the flat portion 32 of the mounting portion 30 to be the top of the underground tank 20. A hollow lower casing 200 fixed to the lower casing 200, a hollow intermediate casing 210 fixed to the upper portion of the lower casing 200, and a hollow upper casing 220 fixed to the upper portion of the intermediate casing 210. Have

The lower housing 200 includes a lower surface 204 having a lower opening 202 through which the riser tube 40 is inserted, and four side plates 206 standing up around the lower surface 204. In the lower surface 204, a plurality of holes 50 a through which the stud bolts 34 are inserted are provided at the same interval as the stud bolts 34 in the peripheral portion of the lower opening 202.
Further, the lower opening 202 is formed in a dimension that does not contact the bonding portion 36 bonded to the outer periphery of the riser tube 40. Further, the side plate 206 is provided with reinforcing ribs 208 to increase the strength against earth pressure.

As shown in FIG. 7, the lower housing 200 has a divided structure in which a first lower housing 200A and a second lower housing 200B are combined. The first lower housing 200A and the second lower housing 200B are formed in the same shape, each having an engagement groove 200b formed in a U-shape at one end, and the engagement groove 200b at the other end. An engaging portion 200c to be engaged is provided.
Therefore, at the installation site, the first lower housing 200A and the second lower housing 200B are formed into a rectangular frame by engaging the other engagement portion 200c with one engagement groove 200b, The engagement groove 200b and the engagement portion 200c are integrated by bonding or fastening. Therefore, the lower housing 200 can be transported by being divided into the first lower housing 200A and the second lower housing 200B, so that it can be easily transported from the factory to the site.

  The intermediate housing 210 has a lower fitting portion 212 whose lower portion is fitted to the upper end of the side plate 206 of the lower housing 200, an inclined portion 214 that is inclined obliquely upward from the upper portion of the lower fitting portion 212, and an inclined portion 214. And an upper fitting part 216 extending upward from the upper part of the upper part. The upper fitting portion 216 has a side plate on which the upper housing 220 is fitted so as to be slidable in the vertical direction.

  Further, a plurality of support members (first support members) 218 that support the intermediate casing 210 are coupled to the outer wall of the lower fitting portion 212 of the intermediate casing 210. The support member 218 is made of a steel metal rod or the like, and has a lower end fastened to the outer wall of the lower fitting portion 212 and an upper end bent in an inverted J shape to be embedded in the upper reinforced concrete layer 140. Therefore, the intermediate casing 210 is suspended below the upper reinforced concrete layer 140 via the support member 218. For example, even when the horizontal pulling pipe 110 receives downward pressure due to ground subsidence, the casing 50 is moved downward. It is supported not to move.

  Here, a construction method of the casing 50 of the manhole apparatus 10 will be described with reference to FIGS. 8 to 13.

  As shown in FIG. 8, underground tank burying holes 300 are dug in the ground of the installation site, and underground tank installation concrete 310 is provided at a plurality of locations on the bottom surface of the underground tank burying hole 300. After that, the underground tank 20 is suspended by a heavy machine such as a crane and installed in a state where it is placed on the underground tank installation concrete 310 in the underground tank embedding hole 300. And the underground tank 20 is hold | maintained on the concrete 310 for underground tank installation so that the standing pipe 40 may be located in the top part with the metal belt 320. FIG. The metal belt 320 is wound around the upper outer periphery of the underground tank 20 at its intermediate portion, and both ends are locked by anchor bolts (hidden in FIG. 6 and not visible) embedded in the underground tank installation concrete 310. .

  As shown in FIG. 9, a mounting portion 30 made of a resin material is provided at a position surrounding the riser tube 40 at the top of the underground tank 20 buried in the ground. For example, the mounting portion 30 is a contact surface in which viscous FRP is placed on the top surface of the steel inner shell tank 70 where the resin outer shell tank 80 is not formed, and the lower surface is in contact with the top surface of the underground tank 20. 33 is formed, and a flat portion 32 is formed on the upper surface. Further, an adhesive portion 36 is formed on the outer periphery of the riser tube 40. As described above, the abutment surface of the resin attachment portion 30 abuts on the top of the steel inner shell tank 70, so that the load of the casing 50 is attached to the leakage detection layer 72 so that it does not act. Further, although the contact surface 33 of the mounting portion 30 contacts the resin sheet 82, the mounting portion 30 itself is made of resin, and the load is distributed over the entire area of the contact surface 33. The peeling of 82 can be prevented.

  Subsequently, the plurality of stud bolts 34 described above are embedded in the flat portion 32, and then the plate member 60 is fixed to the flat portion 32.

  When the resin material of the attachment portion 30 is hardened, the rubber packing 62 having elasticity is attached on the plate member 60. The rubber packing 62 cushions the displacement of the housing 50 when the housing 50 is attached and after construction.

  Next, as shown in FIG. 4, the lower surface 204 of the lower housing 200 is placed on the flat portion 32, and the stud bolts 34 are inserted into the plurality of holes 209 in the lower surface 204 of the lower housing 200. Then, the nut 53 is screwed into each of the plurality of stud bolts 34, and the nut 53 is tightened with a tool such as a spanner.

  As shown in FIG. 10, the lower end flange 92 of the pipe joint 90 is fastened to the upper end flange 42 of the riser pipe 40, and the pipe joint 90 is connected to the upper end of each riser pipe 40. Subsequently, the flange 124 of the connection member 120 is fastened to the side flange 96 of the pipe joint 90, and the laterally drawn pipe 110 made of resin pipe is connected to the side flange 96 of the pipe joint 90 via the connection member 120. At that time, the horizontal piping 110 is inserted into the lower housing 200 through the piping insertion hole 207 provided in the side plate 206 of the lower housing 200.

  As shown in FIG. 11A, a bellows 400 that can expand and contract in the radial direction is attached to the outer periphery of the horizontal pulling pipe 110 inserted through the pipe insertion hole 207. An annular gap formed between the pipe insertion hole 207 and the horizontal pulling pipe 110 is closed by the bellows 400. Thereby, the earth and sand layer 130 and water outside the side plate 206 are prevented from entering the housing 50 through the gap between the pipe insertion hole 207 and the horizontal pulling pipe 110.

The bellows 400 is fitted to the fixing portion 402 fixed to the side plate 206 surrounding the periphery of the pipe insertion hole 207, the expansion / contraction section 404 formed in a bellows shape so as to expand and contract in the radial direction, and the outer periphery of the horizontal pulling pipe 110. And a fitting portion 408 fitted to the fitting fixing member 406.
Further, the bellows 400 is integrally formed of an elastic material such as a rubber material, and is heated and fused or bonded in a state where the fixing portion 402 extending to the outer peripheral side is in close contact with the side plate 206. Further, the fitting portion 408 is heated and fused in a state where the end portion is fitted in the groove 406 a of the fitting fixing member 406. Therefore, when the horizontal pulling pipe 110 moves up and down relative to the housing 50, the expansion / contraction part 404 of the bellows 400 expands and contracts in the vertical direction to allow the horizontal pulling pipe 110 to move and the pipe insertion hole 207. Therefore, the soil layer 130 and water are prevented from entering.

  Moreover, as a modification of the bellows mounting structure, there is the following. As shown in FIG. 11B, in Modification 1, the cylindrical member 410 is provided through the pipe insertion hole 207, the horizontal piping 110 is inserted into the cylindrical member 410, and the cylindrical member 410 and the horizontal piping 110 are connected to each other. A bellows 420 that expands and contracts in the axial direction is mounted therebetween.

  The bellows 420 of this modification 1 is provided in the housing 50, both ends 420a and 420b are formed in a cylindrical shape, and an expansion / contraction portion 420c is integrally formed at an intermediate portion so as to be expandable / contractable in the axial direction. Further, one end 420 a of the bellows 420 is fixed to the outer periphery of the horizontal pulling pipe 110 by a fixing tool 422 such as a retaining ring, and the other end 420 b is fixed to the outer periphery of the cylindrical member 410 by a fixing tool 423 such as a retaining ring.

  Since the inner diameter of the cylindrical member 410 is sufficiently larger than the outer diameter of the horizontal pulling pipe 110, the horizontal pulling pipe 110 is inserted into the cylindrical member 410 in a loosely fitted state. Therefore, when the horizontal piping 110 moves up and down relative to the housing 50, the expansion / contraction part 422 of the bellows 420 expands and contracts in the vertical direction to allow the movement of the horizontal piping 110 and the pipe insertion hole 207. Therefore, the soil layer 130 and water are prevented from entering the housing 50.

  Further, as shown in FIG. 11C, in Modification 2, the flange portion 432 of the bellows fixing member 430 is fixed to the side plate 206, and the horizontal piping 110 is inserted into the cylindrical portion 434 of the bellows fixing member 430 in a loosely fitted state. Further, a bellows 420 is mounted between the cylindrical portion 434 and the horizontal piping 110. One end 420 a of the bellows 420 is fixed to the outer periphery of the cylindrical portion 434 of the bellows fixing member 430 by a fixing tool 422 such as a retaining ring, and the other end 420 b is fixed to the outer periphery of the horizontal pulling pipe 110 by a fixing tool 423 such as a retaining ring. The

  Since the inner diameter of the cylindrical part 434 of the bellows fixing member 430 is sufficiently larger than the outer diameter of the horizontal pulling pipe 110, the horizontal pulling pipe 110 is inserted into the cylindrical part 434 in a loosely fitted state. Therefore, when the horizontal piping 110 moves up and down relative to the housing 50, the expansion / contraction part 422 of the bellows 420 expands and contracts in the vertical direction to allow the movement of the horizontal piping 110 and the pipe insertion hole 207. Therefore, the soil layer 130 and water are prevented from entering the housing 50.

  As shown in FIG. 12, when the horizontal pipe 110 is connected to the pipe joint 90, the intermediate casing 210 is attached to the upper part of the lower casing 200. The lower fitting portion 212 of the intermediate casing 210 has a seal structure 440 so that water from the underground does not enter between the upper end of the side plate 206 of the lower casing 200.

  As a detailed configuration of the seal structure 440, there are seal structures 440A to 440E shown in FIGS. 13 (A) to 13 (E). As shown in FIG. 13A, the seal structure 440A is attached so that the seal member 442 is wound in an S shape between the upper end 206a of the side plate 206 and the lower end 212a of the lower fitting portion 212. . An upper end 206a of the side plate 206 is bent in a J shape, and one end 442a of the seal member 442 is wound from the outside to the inside of the upper end 206a of the side plate 206. Further, the other end 442 b of the seal member 442 is bent from the outside to the inside of the lower end 212 a of the lower fitting portion 212. The seal member 442 is sandwiched from the horizontal direction by a gap 444 formed between the upper end 206a of the side plate 206 and the lower end 212a of the lower fitting portion 212.

  The clamping force with respect to the seal member 442 is obtained by the elastic return force F1 that the lower end 212a of the lower fitting portion 212 tries to displace outward and the elastic return force F2 that the upper end 206a of the side plate 206 tends to displace inside. Therefore, after the intermediate casing 210 is attached to the upper portion of the lower casing 200, the seal member 442 is compressed between the upper end 206a of the side plate 206 and the lower end 212a of the lower fitting portion 212, and the underground water is stored in the casing. Intrusion into the body 50 is prevented.

  As shown in FIG. 13B, the seal structure 440B includes a seal member 442 by screwing a bolt 446 and a nut 448 inserted between the upper end 206a of the side plate 206 and the lower end 212a of the portion fitting portion 212. Is compressed so that the space between the upper end 206a of the side plate 206 and the lower end 212a of the lower fitting portion 212 is liquid-tightly sealed. Thus, after the intermediate casing 210 is attached to the upper part of the lower casing 200, the seal member 442 is compressed between the upper end 206a of the side plate 206 and the lower end 212a of the lower fitting portion 212, and water in the ground is Intrusion into the housing 50 is prevented.

  As shown in FIG. 13C, the seal structure 440C is attached so that the seal member 442 is wound in an S shape between the upper end 206a of the side plate 206 and the lower end 212a of the lower fitting portion 212. . The upper end 206a of the side plate 206 is bent inward, and the lower end 212a of the lower fitting portion 212 is bent outward. One end 442 a of the seal member 442 is wound around the lower end 212 a of the lower fitting portion 212, and the other end 442 b is wound inside the upper end 206 a of the side plate 206. The seal member 442 is held in the horizontal direction by a gap 444 formed between the upper end 206a of the side plate 206 and the lower end 212a of the lower fitting portion 212. Thus, after the intermediate casing 210 is attached to the upper part of the lower casing 200, the seal member 442 is compressed between the upper end 206a of the side plate 206 and the lower end 212a of the lower fitting portion 212, and water in the ground is Intrusion into the housing 50 is prevented.

  As shown in FIG. 13D, the seal structure 440D includes a seal member 442 placed from the inside to the outside of the vertical portion 450a of the angle member 450 having an L-shaped cross-sectional shape, and inside the vertical portion 450a. The upper end 206a of the side plate 206 is opposed, the lower end 212a of the lower fitting portion 212 is opposed to the outside of the vertical portion 450a, and a tapping screw 460 is screwed in from the outside, and the side plate 206 and the lower fitting portion 212 are interposed via the angle member 450. Is fixed.

  One end 442a of the seal member 442 is placed so as to contact the horizontal portion 450b of the angle member 450, and the other end 442b is attached so as to contact the inside of the vertical portion 450a. The tapping screw 460 is inserted into the upper end 206 a of the side plate 206 by screwing the vertical portion 450 a of the angle member 450 from the outside of the lower fitting portion 212. When the tapping screw 460 is rotated, the male screw portion is inserted into the through hole of the angle member 450 while cutting the female screw.

  Therefore, the side plate 206 and the lower fitting portion 212 can be fixed while the seal member 442 is compressed by screwing the tapping screw 460 from the outside of the housing 50. Thus, after the intermediate casing 210 is attached to the upper portion of the lower casing 200, the seal member 442 is compressed between the angle member 450 and the lower end 212a of the lower fitting portion 212, and the water in the ground is transferred to the casing. Intrusion into 50 is prevented.

  As shown in FIG. 13E, the seal structure 440E is provided with a receiving portion 470 that protrudes in the horizontal direction on the outer wall of the side plate 206, and the end 442a of the seal member 442 is wound around the upper surface from the upper surface of the receiving portion 470. The other end 442b of the seal member 442 is wound from the outside to the inside of the upper end 206a of the side plate 206. Further, the lower end 212 a is brought into contact with the seal member 442 placed on the receiving portion 470 in a state where the lower fitting portion 212 is opposed to the outside of the side plate 206.

  The lower end 212 a of the lower fitting portion 212 presses the seal member 442 with its own weight, and compresses the seal member 442 with the receiving portion 470. Thus, after the intermediate casing 210 is attached to the upper portion of the lower casing 200, the seal member 442 is compressed between the receiving portion 470 and the lower end 212a of the lower fitting portion 212, and the water in the ground is Intrusion into 50 is prevented.

  Thus, after attaching the intermediate casing 210 to the upper part of the lower casing 200 so as to be sealed by any of the sealing structures 440A to 440E, as shown in FIG. It is attached to the upper fitting part 216 of the housing 210. The upper housing 220 is a rectangular box having a hollow portion in which resin panels are combined from four directions, and the height position in the vertical direction is adjusted with respect to the upper fitting portion 216 of the intermediate housing 210. Fastened with bolts and nuts.

  A manhole cover 52 is placed on the upper opening of the upper fitting portion 216 and closed.

  Thereafter, as shown in FIG. 1, the earth and sand layer 130 is put around the underground tank 20 and hardened, and the upper reinforced concrete layer 140 is laminated on the upper side of the earth and sand layer 130. The upper reinforced concrete layer 140 is embedded with an upper end of a support member 218 fixed so as to extend upward from the intermediate casing 210. Therefore, the housing 50 is supported in a state of being suspended from the upper reinforced concrete layer 140 via the support member 218. Therefore, for example, even when the horizontal pulling pipe 110 receives a downward pressure due to ground subsidence, the casing 50 can be supported so as not to move downward. This completes the construction of the underground tank 20.

  FIG. 14 is a longitudinal sectional view showing a manhole apparatus installed in the FF double shell tank. FIG. 15 is a side view of the manhole apparatus according to the second embodiment. In FIG. 14 and FIG. 15, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 14 and FIG. 15, an underground tank 500 composed of an FF double shell tank has a resin outer shell tank 520 disposed outside the resin inner shell tank 510, and the resin inner shell tank 510 and the resin inner shell tank 510. Between the outer shell tank 520, a leakage detection layer 530 for leakage detection is formed over the entire circumference. In addition, internal reinforcing ribs 540 are provided on the entire circumference in the space where the leakage detection layer 530 is formed. Further, a plurality of external reinforcing ribs 550 are provided in an annular shape on the outer periphery of the resin outer shell tank 520. The plurality of external reinforcing ribs 550 are provided so as to protrude at predetermined intervals in the longitudinal direction of the cylindrical tank.

  The manhole device 600 according to the second embodiment has substantially the same configuration as the manhole device 10 according to the first embodiment described above, and is different in that a lower surface side inclined surface 560 is provided on the lower surface side of the lower housing 200 and the lower surface side inclined surface 560 is. Is supported by a pair of support members (second support members) 570.

  On the top surface of the underground tank 500, the mounting portion 30 is provided directly as in the first embodiment. Further, a pair of support members 570 that support the lower surface side inclined surface 560 formed on the lower surface side of the housing 50 are provided outside the attachment portion 30.

  The pair of support members 570 extend in the longitudinal direction of the cylindrical tank so as to be horizontally mounted on the plurality of external reinforcing ribs 550, and both end portions are connected and fixed by connecting members 580. Therefore, the pair of support members 570 are fixed to the underground tank 500 so as to support the lower surface side inclined surface 560 of the housing 50.

  Further, the pair of support members 570 are fixed to the underground tank installation concrete 310 (see FIG. 8) by the metal belt 320 wound around the outer periphery of the external reinforcing rib 550.

  The underground tank 500 composed of the FF double shell tank is also provided at the top of the tank because the leak detection layer 530 is formed all around. Therefore, the leakage detection layer 530 is also present below the mounting portion 30.

  However, the mounting portion 30 made of resin is configured such that the load is not concentrated on a part of the top of the tank, and the load of the housing 50 is supported by the entire contact surface 33. The leak detection layer 530 between the outer shell tank 520 and the outer shell tank 520 is prevented from being deformed so that the gap is narrowed.

  Further, since the pair of support members 570 receives the load by the plurality of external reinforcing ribs 550, the support members 570 are attached so as not to press the leakage detection layer 530.

  In addition, although the said Example demonstrated the manhole apparatus of the underground tank installed in a gas station, it is not restricted to this, For example, other fuels (for example, gas, such as CNG, hydrogen supplied to a fuel cell vehicle, etc.) Of course, the present invention can also be applied to a manhole device mounted on a tank for storage.

It is a block diagram which shows Example 1 of the manhole apparatus of the underground tank by this invention. FIG. 4 is a diagram illustrating a configuration of an attachment portion 30. 4 is a perspective view showing a configuration of a plate member 60. FIG. It is a longitudinal cross-sectional view which expands and shows the attaching part 30. FIG. It is a perspective view which shows the state which divided | segmented the plate member 60. FIG. 3 is a perspective view illustrating a configuration of a housing 50. FIG. It is a perspective view which shows the state which divided | segmented the lower housing | casing 200. FIG. It is a longitudinal cross-sectional view which shows the state which installed the underground tank 20 in the ground. 4 is a longitudinal sectional view showing a state where a lower housing 200 is mounted on the top of an underground tank 20. FIG. 4 is a longitudinal sectional view showing a state where a pipe joint 90 and a horizontal pulling pipe 110 are attached to the lower housing 200. FIG. It is a longitudinal cross-sectional view explaining a bellows mounting structure. It is a longitudinal cross-sectional view explaining the modification 1 of a bellows attachment structure. It is a longitudinal cross-sectional view explaining the modification 2 of a bellows attachment structure. 4 is a longitudinal sectional view showing a state in which a housing 50 is mounted on the top of an underground tank 20. FIG. It is a figure for demonstrating seal structure 440A-440E. It is a longitudinal cross-sectional view which shows the manhole apparatus installed in FF double shell tank. It is a side view of the manhole apparatus of Example 2.

Explanation of symbols

10,600 Manhole device 20 Underground tank 30 Mounting portion 32 Flat portion 31 Fixing portion 33 Contact surface 34 Stud bolt 40 Rising pipe 50 Housing 52 Manhole cover 54 Internal space 60 Plate member 62 Rubber packing 66 Maintenance port 70 Inside of steel Shell tank 72 Leakage detection layer 80 Plastic outer shell tank 90 Piping joint 110 Horizontal piping 120 Connection member 130 Earth and sand 140 Upper reinforced concrete layer 200 Lower housing 206 Side plate 207 Pipe insertion hole 210 Intermediate housing 218 Support member 220 Upper housing 300 Underground tank embedding hole 310 Concrete tank for underground tank installation 320 Metal belt 400, 420 Bellows 440, 440A to 440E Seal structure 500 Underground tank 510 Resin inner shell tank 520 Resin outer shell tank 530 Leak detection layer 540 Internal reinforcement rib 550 External Supplement Ribs 570 support member

Claims (7)

In a manhole device having a housing that forms a space for accommodating a riser pipe provided at the top of an underground tank, and a lid that closes an upper opening of the housing,
Provide a mounting portion having a flat portion directly supporting the lower surface of the housing at the top of the underground tank,
A manhole device for an underground tank, wherein a fastening member for fastening the casing is provided at the mounting portion. The mounting portion is
A resin material applied to the top of the underground tank and having adhesive properties;
The plate member having a flat portion that has at least a lower surface bonded and fixed to the top of the underground tank entirely by the resin material and directly supports the lower surface of the housing. Manhole equipment for underground tanks. The underground tank is a double shell tank structure in which a detection layer for leakage detection is formed by a resin outer shell tank up to a position exceeding the maximum liquid level in the steel inner shell tank,
The manhole device for an underground tank according to claim 1 or 2, wherein the mounting portion is provided on a top portion of the steel inner shell tank where the resin outer shell tank is not formed.   4. The first support member according to claim 1, further comprising a first support member embedded in an upper concrete layer having a lower end coupled to an upper portion or a side portion of the housing and an upper end formed above the underground tank. An underground tank manhole device according to any one of the above. In a manhole device having a housing that forms a space for accommodating a riser pipe provided at the top of an underground tank, and a lid that closes an upper opening of the housing,
The underground tank is a double-shell tank structure in which a resin outer shell tank is disposed outside a resin inner shell tank,
A mounting portion is provided at the top of the resin outer shell tank,
The mounting portion is a resin material that is applied to the top of the underground tank and has adhesive properties;
A plate member having a flat part that directly supports and supports the lower surface of the housing in which at least the lower surface is bonded and fixed to the top of the underground tank entirely by the resin material,
A manhole device for an underground tank, wherein a fastening member for fastening the casing is provided at the mounting portion. A plurality of annular ribs projecting at predetermined intervals in the longitudinal direction of the outer periphery of the resin outer shell tank;
A second support member that is mounted between the plurality of annular ribs and receives a load of the housing in contact with a lower portion of the housing;
The manhole device for an underground tank according to claim 5, further comprising:   7. A first support member having a lower end coupled to an upper portion or a side portion of the housing and an upper end embedded in an upper concrete layer formed above the underground tank. An underground tank manhole device according to any one of the above.

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