JP2016070390A - Connection structure of underground pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent moisture or water from being accumulated in a gap between ribs closest to the end edge of an underground pipe inside a connection part, in a connection structure configured by fitting a pair of underground pipes, on the outer peripheral surface of which the rib is formed, to each other.SOLUTION: An connection structure includes a pair of underground pipes 2, 3. On the outer peripheral surfaces of the underground pipes 2, 3, plural ribs 16, 21 projecting in a radial direction are formed with intervals along the axial directions of the underground pipes 2, 3. Between a rib 16A closest to an end edge 38 of the underground pipe 2 and a rib 16B adjacent to the rib 16A, an annular elastic member 32 is provided. The end part of the underground pipe 3 is externally fitted to the underground pipe 2 while airtightness is ensured with the elastic member 32.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a connection structure for underground pipes.

  2. Description of the Related Art In recent years, underground heat exchange systems are known in which outside air is introduced into pipes buried in the ground (hereinafter referred to as underground pipes) and heat exchanged in the ground is taken into a building. One end of the underground pipe is opened to the ground to take in outside air, and is connected to a blower as necessary. On the other hand, the other end of the underground pipe is connected to the building.

  In such a geothermal heat exchange system, in summer, for example, high-temperature outside air exceeding 30 ° C. is introduced into the underground pipe from the blower, and heat exchange is performed in the ground at about 18 ° C. to 20 ° C. Cooled to the extent and taken into the building. On the other hand, in winter, for example, below-zero outside air is introduced into the underground pipe from the blower, heated to about 3 ° C. by heat exchange in the ground at about 5 ° C., and taken into the building.

  Examples of underground pipes constituting the underground heat exchange system include resin pipes that are widely used for a wider range than before. The underground pipe may be constituted by a single resin pipe or may be constituted by connecting a plurality of resin pipes in series. Actually, a plurality of resin pipes are manufactured at the factory, transported to the vicinity of the installation site of underground pipes, and the end of the other resin pipe is attached to the end of one of the plurality of resin pipes at the time of installation. It is often connected by external fitting. In such a buried underground pipe connection structure, a water stop member is provided at the connecting portion of the underground buried pipe that forms a pair.

  As a connection structure for underground pipes having a water stop member, for example, in Patent Document 1, a predetermined length is inserted into the inner surface of the front end of the insertion port inserted into the rubber ring receiving port, and a predetermined length is provided from the front end. A ring-shaped inner surface level difference elimination ring is disclosed that includes a cylindrical ring that protrudes at a length of approximately 5 mm and a stopper that is provided at the outer periphery of the cylindrical ring and substantially at the center in the length direction. Moreover, in patent document 2, in the rubber ring compressed between the annular groove between ribs of a ribbed pipe insertion opening which has an annular rib on the outer surface, and the pipe receptacle, the inner peripheral surface in contact with the annular groove bottom surface between ribs is disclosed. A rubber ring for a pipe joint seal with a rib provided with a number of cuts in a direction perpendicular to the circumferential direction is disclosed.

JP 2003-214571 A Japanese Utility Model Publication No. 5-14777

  FIG. 4 is a cross-sectional view showing a rubber ring-shaped water-stopping member disclosed in Patent Document 1 and Patent Document 2 and a part of the connection structure of the underground buried pipe. The connection structure 10 includes a pair of underground pipes 2 and 3. On the outer peripheral surface of the pipe body 20 of the underground pipes 2 and 3, a plurality of ribs 16 and 21 projecting in the radial direction are formed at intervals along the axial direction of the underground pipes 2 and 3. In the connection structure 10, the end portion 31 of the underground tube 3 is externally fitted to the end portion 30 of the underground tube 2. The end 31 of the underground pipe 3 is a receiving port that allows the end 30 of the underground pipe 2 to be fitted therein, and has an enlarged diameter. In order to improve the water-stopping property of the connection structure 10, rubber is provided in the gap 17 </ b> B between the rib 16 </ b> B second closest to the end 38 on the end 30 side of the underground tube 2 and the rib 16 </ b> C adjacent in the direction away from the end 38. An elastic member 32 such as a ring is provided. Further, a protective member 34 is provided on the end edge 38 of the underground pipe 2 in order to prevent breakage due to the collision between the end portions 30 and 31.

  Since there is always water vapor in the outside air, when the outside air temperature is higher than the temperature in the ground, when the outside air is introduced into the ground, the humidity in the underground pipe increases. Further, when the introduced outside air is circulated through the hollow portion and heat exchange is performed with the geothermal heat, water is generated on the inner peripheral surface of the underground pipe due to condensation. At this time, from a slight gap between the protective member 34 and the end 31 of the underground pipe 3, the gap 17A between the rib 16A and the rib 16B where moisture and water are closest to the end edge 38 of the underground pipe 2 is provided. As a result, the sanitary condition of the connection structure 10 deteriorates.

  The present invention has been made in view of the above circumstances, and in a connection structure configured by fitting a pair of underground pipes having ribs provided on the outer peripheral surface thereof, moisture and water are connected. It is an object of the present invention to prevent accumulation in the gap between the ribs closest to the edge of the underground pipe inside the portion.

The underground buried pipe connection structure according to the present invention includes a pair of underground pipes, and a radially extending rib extends along an axial direction of the underground pipe on the outer peripheral surface of the underground pipe. An annular elastic member is provided between the first rib closest to the edge of one of the underground pipes and the second rib adjacent to the first rib. An end portion of the other underground pipe is externally fitted to the one underground pipe while ensuring airtightness with the elastic member.
According to the above configuration, since the annular elastic member is disposed between the rib closest to the end edge of one of the underground pipes and the rib adjacent to the rib, Intrusion of water generated by moisture and condensation introduced into the hollow portion of the tube between the ribs is not allowed, and the moisture and water are prevented from accumulating between the ribs.

In the underground buried pipe connection structure according to the present invention, it is preferable that a groove portion extending in a circumferential direction of the underground pipe is formed on the outer peripheral surface of the elastic member.
According to the above configuration, the elastic member sufficiently expands even with a relatively low circumferential tensile force, so that it can be easily mounted between the ribs.

In the underground pipe of this invention, it is preferable that the said edge of said one underground pipe is covered with the protection member.
According to the above configuration, when a pair of underground pipes are connected, even if the edge of one underground pipe collides with the end of the other underground pipe, the impact applied to each is absorbed by the protective member. Therefore, the breakage of the end portion of one underground pipe and the end portion of the other underground pipe is surely prevented.

  According to the present invention, moisture or water can be prevented from being accumulated in the gap between the ribs closest to the edge of the underground pipe inside the connection portion between the pair of underground pipes. A connection structure is provided.

It is the schematic which shows the underground heat exchange system using the connection structure of the underground pipe | tube of this invention. It is sectional drawing which shows the connection structure of the underground burial pipe of one Embodiment of this invention. It is sectional drawing for demonstrating the connection method of the underground pipe | tube which makes a pair. It is sectional drawing which shows a part of connection structure of the conventional underground pipe.

  Hereinafter, a connection structure for underground pipes to which the present invention is applied will be described with reference to the drawings. The drawings used in the following description are schematic, and the length, width, thickness ratio, and the like are not necessarily the same as the actual ones, and can be changed as appropriate.

FIG. 1 is a schematic view showing an underground heat exchange system 1 using a buried underground pipe connection structure 10 (hereinafter simply referred to as a connection structure 10) according to an embodiment to which the present invention is applied.
As shown in FIG. 1, the underground heat exchange system 1 includes a blower 5 and an underground pipe 11.
The blower 5 is for taking in outside air and allowing it to pass through the hollow portion of the underground tube 11, and is installed on the ground G, for example.
The plurality of underground pipes 11 are connected to each other with a connection structure 10.
The underground pipe 11 exchanges heat between the heat of the outside air taken into the hollow portion of the underground pipe 11 from the blower 5 and the geothermal heat, and derives the heat-exchanged outside air into the building 7 on the ground G. Is to do. One end of the underground pipe 11 is connected to the blower 5. The other end of the underground pipe 11 is opened in the building 7. And at least a part of the underground pipe 11 is embedded in the underground U.
The blower 5 may be omitted as long as a sufficient amount of outside air can be directly taken into the underground pipe 11 and the outside air can be sent in the direction of the arrow in the underground pipe 11. For example, one end of the underground pipe 11 may be open to the ground.

  The connection structure 10 includes a plurality of underground pipes 11 capable of exchanging heat between the heat of the outside air taken into the pipe and the geothermal heat, and the plurality of underground pipes 11 are connected in series by fitting ends. Is connected to.

FIG. 2 is a cross-sectional view showing the connection structure 10 of the present embodiment, and is a cross-sectional view showing a connection portion between a pair of underground pipes 11 and 11. The connection structure 10 may have three or more underground buried pipes 11 connected in series, and may have two or more connection portions.
As shown in FIG. 2, a plurality of ribs 16 and 21 projecting radially from the outer peripheral surface are formed at intervals in the longitudinal direction of the pipe body 20 of the pair of underground pipes 11 and 11. . The projecting portion of the rib 16 is larger than the projecting portion of the rib 21, but may be smaller than the projecting portion of the rib 21 and may have substantially the same area as the projecting portion of the rib 21.

The material of the underground tube 11 is not particularly limited as long as heat exchange is possible between the heat of the outside air and the geothermal heat. Examples of the material of the underground pipe 11 include polyvinyl chloride resin. In addition, from the point which raises the tolerance of the underground pipe | tube 11, it is preferable that the light-resistant resin layer like AES resin or ASA resin is coat | covered on the outer peripheral surface of the underground pipe | tube 11 which consists of polyvinyl chloride resin.
The thicknesses of the tube body 20 and the ribs 16 and 21 are preferably set in consideration of the thermal conductivity of the material of each member.
The underground pipe 11 is formed by, for example, mold forming.

  In the connection structure 10, among the pair of underground pipes 11, the end 30 of the underground pipe 2 (one underground pipe) is a pipe insertion port, and the underground pipe 3 (the other underground pipe). An end 31 of the tube is a tube receiving port. That is, the end portion 31 of the underground tube 3 is externally fitted to the end portion 30 of the underground tube 2 from the direction D2 of the arrow. The end portion 31 of the underground tube 3 can be inserted into the end portion 30 of the underground tube 2 and has an enlarged diameter.

  In the gap 17A between the rib 16A (first rib) closest to the edge 38 on the end 30 side of the underground pipe 2 and the rib 16B (second rib) adjacent to the rib 16A, an annular elastic member is provided. 32 is mounted. The elastic member 32 is for increasing the water-stopping property at the connecting portion between the underground pipes 2 and 3. The end 31 of the underground pipe 3 is fitted on the end 30 of the underground pipe 2 so as to cover at least the elastic member 32. Therefore, the end edge on the end 31 side of the underground pipe 3 is arranged so as to substantially overlap the rib 16B on the end 30 side of the underground pipe 2 in a cross-sectional view.

On the outer peripheral surface of the elastic member 32, a groove 36 extending in the circumferential direction of the elastic member 32 and the underground tube 2 is formed. By forming the groove portion 36, when a tensile force in the circumferential direction is applied to the elastic member 32, the cross-sectional area of the elastic member 32 on which a tensile stress acts on the tensile force is substantially reduced. Thereby, the tensile stress is increased under the same tensile force in the circumferential direction, and the elastic member 32 is greatly elongated. Therefore, the elastic member 32 is sufficiently expanded in diameter even with a relatively low circumferential tensile force, and can be easily mounted in the gap 17A.
Examples of the material of the elastic member 32 include synthetic rubber, EPDM, SBR, and elastomer.

  The edge 38 of the underground pipe 2 is covered with a protective member 34. The protection member 34 is damaged when the end portion 31 of the underground tube 3 is externally fitted to the end portion 30 of the underground tube 2 from the direction D2 of the arrow due to the collision between the tube bodies 20 of the end portions 30 and 31. Is to prevent. Examples of the material of the protective member 34 include synthetic rubber, EPDM, SBR, and elastomer.

Next, a method of connecting the underground pipes 2 and 3 will be described with reference to FIG. FIG. 3 is a cross-sectional view for explaining a method of connecting the underground pipes 2 and 3.
3, the same components as those of the connection structure 10 illustrated in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.

  First, underground pipes 2 and 3 are prepared, and the edge 38 of the underground pipe 2 is covered with a protective member 34 as shown in FIG. Further, the elastic member 32 is mounted in the gap 17A between the rib 16A of the underground pipe 2 and the adjacent rib 16B.

Next, the end portion 31 of the underground tube 3 is fitted on the end portion 30 of the underground tube 2. At this time, the end edge on the end 31 side of the underground pipe 3 need not substantially overlap the rib 16B of the underground pipe 2. The end 31 of the underground pipe 3 may be lightly fitted around the end 30 of the underground pipe 2 within a range that can be manually performed.
And the opening of the edge part (illustration omitted) on the opposite side to the edge part 31 of the underground pipe | tube 3 is plugged up with a suitable member (illustration omitted). A suction device 40 is attached to the opening at the end opposite to the end 30 of the underground pipe 2. Thereby, the hollow part of underground pipes 2 and 3 becomes a sealed space.
Subsequently, the suction device 40 is operated to suck the air in the hollow portions of the underground pipes 2 and 3 in the direction D1 indicated by the arrow. As a result, the underground pipe 3 moves in the direction D2 indicated by the arrow, and the underground pipes 2 and 3 approach each other. By performing suction in the hollow portion of the underground pipes 2 and 3 until the end edge on the end 31 side of the underground pipe 3 substantially overlaps the rib 16B of the underground pipe 2, 3 are securely connected, and the connection structure 10 shown in FIG. 2 is completed.

In the underground heat exchange system 1 shown in FIG. 1 provided with the connection structure 10 described above, outside air is introduced from the blower 5 into the hollow portion of the underground pipe 11 to exchange heat with the underground. 7 is taken in.
In the present embodiment, ribs 16 and 21 projecting in the radial direction are provided on the outer peripheral surface of the pipe body 20 of the underground pipe 11 along the axial direction of the underground pipe 11 (that is, the direction D2 shown in FIG. 2). Are formed at intervals. An annular elastic member 32 is provided in a gap 17A between the rib 16A closest to the end edge 38 of the underground buried pipe 2 and the rib 16B adjacent to the rib 16A among the pair of underground buried pipes 11 and 11. The end 31 of the underground tube 3 is externally fitted to the end 30 of the underground tube 2 while securing airtightness with the elastic member 32.
According to the connection structure 10, the gap 17 </ b> A is not a gap as before, and the elastic member 32 is disposed in the gap 17 </ b> A. Therefore, moisture and condensation introduced into the hollow portion of the underground tube 11. It is not allowed to enter the water gap 17A generated by the above, and it is possible to prevent the moisture and water from collecting in the gap 17A.
Therefore, according to the present invention, a plurality of underground pipes 11,..., 11 connected in series are provided, and moisture and water do not accumulate in the connection portion between the underground pipes 11, 11, so that hygiene can be achieved. An excellent connection structure 10 is provided.

  Moreover, in the connection structure 10 of this embodiment, it is preferable that the outer peripheral surface of the elastic member 32 is formed with a groove portion extending in the circumferential direction of the underground pipe. According to this configuration, the elastic member 32 can sufficiently expand in diameter even with a relatively low circumferential tensile force, and the elastic member 32 can be easily mounted in the gap 17 </ b> A of the elastic member 3.

  Moreover, in the connection structure 10 of this embodiment, it is preferable that the edge 38 of the underground pipe 2 is covered with the protective member 34. According to this configuration, when the underground pipes 2 and 3 are connected, the end 30 of the underground pipe 2 and the end 31 of the underground pipe 3 can be reliably prevented from colliding and being damaged. it can.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments, and various modifications are possible within the scope of the gist of the present invention described in the claims. Deformation / change is possible.

DESCRIPTION OF SYMBOLS 10 ... Connection structure, 11 ... Underground pipe, 16, 21 ... Rib, 16A ... Rib (first rib), 16B ... Rib (second rib), 32 ... Elastic member, 34 ... Protection member, 36 ... Groove, 38 ... edge

Claims (3)

With a pair of underground pipes,
On the outer peripheral surface of the underground pipe, a plurality of ribs extending in the radial direction are formed at intervals along the axial direction of the underground pipe,
An annular elastic member is provided between the first rib closest to the edge of one underground pipe and the second rib adjacent to the first rib,
The connection structure of the underground pipe | tube with which the edge part of the other underground pipe | tube is externally fitted by said one underground pipe | tube while ensuring airtightness with the said elastic member.   The underground buried pipe connection structure according to claim 1, wherein a groove extending in a circumferential direction of the underground pipe is formed on an outer peripheral surface of the elastic member.   The underground pipe connection structure according to claim 1 or 2, wherein the edge of the one underground pipe is covered with a protective member.

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