JP2016128643A - Underground heat collection pipe installation tool and underground heat collection pipe installation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underground heat collection pipe installation tool and an underground heat collection pipe installation method for easily installing a header joint in the vicinity of the ground when burying a plurality of sets of underground heat collection pipes.SOLUTION: An underground heat collection pipe installation tool comprises a pipe holding part 13 for forming a first insertion hole 10 and a second insertion hole 11 for juxtaposing and inserting a plurality of tubes 3A and 3B when installing a plurality of sets of underground heat collection pipes of setting the two tubes 3A and 3B of a forward passage and a backward passage as one set in an excavation hole formed in the ground with the axis as the vertical direction and an installation part 14 for installing the pipe holding part 13 in an upper end opening part 7t of the excavation hole.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an underground heat collection tube installation jig and an installation method of an underground heat collection tube.

  In recent years, in order to save energy, underground heat is used as a heat source for air conditioning and the like. For heat collection from the ground, a resin underground heat collection tube consisting of two sets of a forward tube that feeds the heat medium into the ground and a return tube that returns the heat medium from the ground to the heat exchanger is grounded. It is buried inside, exchanging heat between the ground G and the heat medium in the heat collecting tube, and collecting underground heat. Some of such heat exchangers are embedded in the underground in the substantially vertical direction from several tens of meters to about several hundreds of tens of meters.

When the underground heat collecting pipe is buried in the ground, first, a drilling hole is formed in the ground G, and a cylindrical case pipe is inserted into the drilling hole. Then, the long underground heat collecting tube wound around the bobbin is inserted from the ground toward the bottom of the excavation hole. Here, when multiple sets of underground heat collecting tubes are inserted into one case tube, the ends of the forward tube and the ends of the return tube are connected to the header joint etc. near the ground, and then air conditioning is performed. It may be connected to the ground pipe toward the building to be performed.
However, when multiple sets of underground heat collecting tubes are inserted into one case tube, the underground heat collecting tubes meander in the case tube with bobbin winding rods, and the end of the forward tube and the vicinity of the opening of the excavation hole The position and direction of the end portion of the return tube may vary. In this case, a person other than the worker who installs the header joint on the tube may need to support the header joint while installing the header joint while pulling the tubes scattered by multiple people and bringing them together. May become cumbersome.
In connection with such a problem, a tube insertion spacer used when an underground heat collecting tube is buried is disclosed (for example, Patent Document 1 below). The tube insertion spacer disclosed in Patent Document 1 is attached to the annular support member one by one with a predetermined interval in the longitudinal direction of the forward tube and the backward tube using a binding material such as a commercially available binding band, The upper end of the underground heat collection tube can be aligned.

JP 2009-84979 A

However, the tube insertion spacer of Patent Document 1 is very cumbersome because it is necessary to fix the underground heat collecting tube and the support member many times with a binding band, so that the work efficiency of installing the underground heat collecting tube is poor. There was a problem.
Therefore, the present invention provides an underground heat collecting pipe installation jig and a method for installing an underground heat collecting pipe that facilitate attachment of a header joint near the ground when a plurality of sets of underground heat collecting pipes are embedded.

The present invention allows a plurality of tubes to be inserted side by side when a plurality of sets of underground heat collecting tubes each having a pair of two tubes of an outward path and a return path are installed in an excavation hole formed in the ground with an axis line in a vertical direction. A pipe holding part in which a first insertion hole and a second insertion hole are formed, and an installation part for installing the pipe holding part in an upper end opening of the excavation hole are provided.
With this configuration, the plurality of tubes can be arranged at positions where they can be easily attached to the header joint at the opening of the excavation hole.

The tube holding portion according to the present invention includes a plurality of divided bodies that are connectable on a surface that passes through the first insertion hole and the second insertion hole and extends in a penetrating direction of the first insertion hole and the second insertion hole. It may be.
With this configuration, the underground heat collecting tube installation jig of the present application can be attached at any timing after the insertion of the underground heat collecting tube into the excavation hole is started.

The divided body of the present invention may include a fixing portion that fixes the divided bodies in a state where the divided bodies are connected on the surface.
With this configuration, the divided bodies can be easily fixed to each other.

The underground heat collecting tube installation method according to the present invention includes an underground heat collecting tube installation jig according to any one of claims 1 to 3 and the first insertion hole formed in the underground heat collecting tube installation jig. A step of installing in the upper end opening portion of the excavation hole formed in the ground in a state where the tube constituting the underground heat collecting tube is inserted into each of the second insertion holes, and the underground heat collecting tube with an axis line The method includes a step of inserting a plurality of sets into the excavation hole in a vertical direction and a step of communicating upper ends of the plurality of tubes with header joints.
With this configuration, the plurality of tubes can be arranged at positions where they can be easily attached to the header joint at the opening of the excavation hole.

  The underground heat collecting tube installation jig and the method for installing the underground heat collecting tube of the present invention have an effect of facilitating attachment of a joint near the ground when a plurality of sets of underground heat collecting tubes are embedded.

It is a schematic diagram which shows a part of installation of the underground heat collecting pipe installation jig which concerns on embodiment of this invention, and the heat exchanger which is the application object of the underground heat collecting pipe installation jig of this application. It is a schematic diagram which shows the state which installs underground heat collection pipe | tube installation using the underground heat collection pipe installation jig which concerns on embodiment of this invention, and the underground heat collection pipe | tube installation jig of this application. It is a figure which shows the underground heat collecting pipe installation jig which concerns on embodiment of this invention, (a) is a top view which shows the state which isolate | separated the division body mutually, (b) is a top view which shows the state which connected the division body It is. (A)-(d) It is a schematic diagram which shows the process of installing an underground heat collecting pipe using the underground heat collecting pipe installation jig which concerns on embodiment of this invention. It is a top view which shows the modification of the underground heat collecting pipe installation jig which concerns on embodiment of this invention. It is a top view which shows the modification of the underground heat collecting pipe installation jig which concerns on embodiment of this invention. It is a top view which shows the state which connected the ground pipe for an outward path and the ground pipe for a return path to the underground heat collecting pipe installation jig shown in FIG. 5 via a header joint and an elbow.

  Hereinafter, with reference to the drawings, a heat exchanger including an underground heat collecting pipe to which the present invention is applied and an embodiment of the present invention will be described. In addition, the figure used in the following description is schematic and each dimension is not necessarily the same as an actual thing, It can change suitably.

  As shown in FIG. 1, the heat exchanger 2 to which the underground heat collecting tube installation jig 1 of the present invention is applied is by burying the underground heat collecting tube 3 in the ground G and flowing a heat medium through the pipe. It is a device that exchanges heat between underground heat and a heat medium.

  The heat exchanger 2 includes an underground heat collecting pipe 3 embedded in the ground G as a set of two tubes 3A and 3B connected to a joint 4 having a U-shaped pipe line formed at the tip, The forward ground pipe 5 and the return ground pipe 6 connected to the heat collecting pipe 3 and arranged in the horizontal direction along the ground, and the heat medium received from the forward ground pipe 5 are compressed and expanded again to generate ground heat. And a unit device (not shown) that performs heat exchange.

The underground heat collecting pipe 3 is connected to the outgoing ground pipe 5 and the backward ground pipe 6 and is buried in the ground G. The outgoing heat pipe 3A and the backward pipe 3B exchange heat between the underground heat and the heat medium. I have. The underground heat collecting pipe 3 is formed of a resin material such as polyethylene (PE).
A joint 4 in which a U-shaped pipe is formed is fused between the lower ends 3a and 3b of the pair of underground heat collecting tubes 3, that is, between the lower ends 3a and 3b of the pair of forward tubes 3A and the return tube 3B. ing. The heat medium flows from the forward tube 3A toward the backward tube 3B.

  The outward ground pipe 5 is a pipe for causing the heat medium to flow from the unit device (not shown) toward the outward tubes 3A and 3A. The return path ground pipe 6 is a pipe for collecting and circulating the heat medium from the return path tubes 3B and 3B from a unit device (not shown). The outgoing ground pipe 5 and the backward ground pipe 6 are arranged along the ground.

  A header joint 34 in which a Y-shaped pipe is formed is fused between the upper ends 3c, 3c of the pair of outgoing tubes 3A, 3A and between the upper ends 3d, 3d of the return tubes 3B, 3B. 3A and 3A and return tube 3B and 3B are connected.

The header joint 34 is a joint in which one end side of an elbow-shaped large-diameter pipe 34a branches into a plurality of small-diameter pipes 34b and 34b. Only one of the forward tube 3A and the backward tube 3B is connected to each of the small diameter tubes 34b, 34b of one header joint 34, and the heat medium is branched and sent to the forward tube 3A of the two sets of underground heat collecting tubes 3. The heat medium is collected from the two return tubes 3B.
The forward-ground pipe 5 is connected to the large-diameter pipe 34a of the header joint 34, and the return-ground pipe 6 is connected to the large-diameter pipe 34a of the header joint 34 in which the return pipe 3B is connected to the small-diameter pipes 34b and 34b. It is connected.

  As shown in FIG. 2, the underground heat collecting tube installation jig 1 (hereinafter referred to as “installation jig”) of the present invention is such that the positions in the vicinity of the upper end opening 7t of the excavation hole 7 of the tubes 3A and 3B are not too far apart from each other. The header joint 34 (see FIG. 1) can be easily attached to the upper end portions 3c, 3c (3d, 3d) shown in FIG. 1 of the underground heat collecting pipe 3 inserted into the excavation hole 7 while being roughly determined. To do.

  As shown in FIGS. 3A and 3B, the installation jig 1 has a first insertion hole 10 and a second insertion hole 11 through which a plurality of tubes 3A (3B) and 3A (3B) can be inserted. The pipe holding part 13 and the installation part 14 for engaging the pipe holding part 13 with the upper end opening part 7t of the excavation hole 7 formed in the ground G shown in FIG. 2 are provided.

The tube holding part 13 is a member formed in a plate shape. The 1st penetration hole 10 and the 2nd penetration hole 11 have penetrated between the flat plate surfaces of tube holding part 13 material, and are formed so that it may become parallel to each other by a long hole shape by plane view.
A thermoelectric cable hole 15 is formed between the first insertion hole 10 and the second insertion hole 11.

The installation portion 14 is a portion that projects radially outward from the outer edge 13e of the tube holding portion 13 and engages in the vicinity of the upper end opening 7t of the ground G that forms the excavation hole 7, and is formed in an annular shape. .
In the present embodiment, the tube holding portion 13 and the installation portion 14 are integrally formed (hereinafter, the tube holding portion 13 and the installation portion 14 are collectively referred to as “installation plate P”).

The installation plate P is formed in a substantially disc shape, and an overhanging projection (fixed portion) 20 that projects radially outward is formed on a straight line passing through the center point C of the flat plate surface.
This installation plate P passes through the center in the width direction of the overhanging protrusion 20, the first insertion hole 10 and the second insertion hole 11, and the through direction of the first insertion hole 10 and the second insertion hole 11 (FIG. 3 ( The image can be divided on the virtual plane M extending in the depth direction of the paper in (b). In the present embodiment, the installation plate P is equally divided into two on the virtual plane M1 passing through the central axes O1 and O2 of the first insertion hole 10 and the second insertion hole 11, and the overhanging protrusion 20 is also equal to 2 in plan view. It is divided. Each piece divided on the virtual plane M constitutes divided bodies 21 and 22.

A fitting convex portion 23 is formed on the end surface 21 a of one divided body 21, and a fitting concave portion 24 is formed on the end surface 22 a of the other divided body 22. Thereby, the divided bodies 21 and 22 can be concavo-convexly fitted to each other at the end faces 21a and 22a.
The split projecting protrusion 20 is fitted with the projecting protrusion 20 in a state where the divided bodies 21 and 22 are connected to each other, and has a U-shaped cross-sectional view in which the projecting protrusion 20 is gripped from both sides. Grasping members 25, 25 are used.

Next, a method for installing the heat exchanger 2 using the installation jig 1 will be described.
As shown in FIG. 4A, first, the excavation hole 7 is formed in the ground G in the vertical direction. The excavation hole 7 is formed to a depth of 70 m to 150 m from the ground GS, for example. Then, a cylindrical case tube 27 is inserted into the excavation hole 7. The case tube 27 is made of, for example, concrete, steel, resin, or the like. The case tube 27 is sequentially inserted into the formed excavation hole 7 while excavating the excavation hole 7. In addition, an excavation bit or the like for excavating the ground G is integrally provided at the lower end portion 27b of the case pipe 27, and the case pipe 27 is inserted into the excavation hole 7 at the same time while excavating the ground G with the excavation bit. May be.

  When the case tube 27 is installed in the excavation hole 7 to a predetermined depth, the bobbin 30 in which the long tubes 3A and 3B are wound as a set is placed on the ground G as shown in FIG. Two tubes are installed (in FIG. 4B, a set of two tubes 3A and 3B are arranged in the depth direction of the paper surface). Then, the tubes 3A and 3B are fed out from the bobbins 30 and 30, respectively. A joint 4 in which a U-shaped pipe is formed in advance is connected to the distal ends of the two tubes 3A and 3B. In the present embodiment, two sets of the two tubes 3A, 3B connected by the joint 4 in this way, that is, a total of four tubes 3A, 3B, 3A, 3B are inserted into the case tube 27.

  After the tubes 3A and 3B are inserted for a predetermined length with their axes directed vertically, the installation jig 1 is mounted on the four tubes 3A, 3B, 3A and 3B and installed in the upper end opening 7t of the excavation hole 7. To do. Specifically, as shown in FIGS. 3A and 3B, the two divided bodies 21 and 22 of the installation jig 1 are separated, and the two forward tubes 3A and 3A out of the four are first inserted. The divided bodies 21 and 22 are connected so that the two return tubes 3B and 3B are inserted into the second insertion hole 11 through the hole 10. At this time, the fitting concave portion 24 and the fitting convex portion 23 formed on the end surfaces 21 a and 22 a of the divided bodies 21 and 22 are fitted. Thereby, the position shift in the extending direction of the end faces 21a and 22a is prevented, and the divided bodies 21 and 22 are temporarily fixed. In this state, the gripping members 25 and 25 are fitted to both the protruding protrusions 20 and 20, and the connection of the divided bodies 21 and 22 is securely fixed.

  4C and 4D are views of FIG. 4B viewed from the direction of the arrow L1. As shown in FIG.4 (c), the header coupling 34 is connected to the upper end part of tube 3A, 3A (3B, 3B). Further, on the ground G, the forward ground pipe 5 and the return ground pipe 6 are respectively connected to the large diameter pipes 34a and 34a of the header joint 34, and are connected to a compressor and an expansion valve provided in a unit device (not shown). To do. Here, the forward tubes 3A and 3A connected by the header joint 34 serve as a feeding side for feeding the heat medium from the unit device (not shown) into the ground G, and the return tubes 3B and 3B connected by the header joint 34 are provided. Then, the heat transfer medium from the ground G becomes a recovery side for sending heat to a unit device (not shown).

  After the case tube 27 is pulled out from the ground G as shown in FIG. 4D and removed, the excavation hole 7 is filled with a filler such as silica sand, grout material, cement, etc. Installation in the ground G of No. 3 is completed.

As described above, the installation jig 1 is attached to the tubes 3A and 3B and installed in the excavation hole 7, thereby suppressing the meandering of the tubes 3A and 3B due to the winding rod when the tubes 3A and 3B are inserted. There is an effect that the underground heat collecting tube 3 can be inserted therein.
Further, the installation jig 1 has four tubes 3A, 3A, 3B, 3B that are not displaced from the first insertion hole 10 and the second insertion hole 11, so that the outgoing tubes 3A, 3A are near the upper end opening 7t of the excavation hole 7. There is an effect that the return tubes 3B and 3B can be easily fused to the header joint 34, respectively.

  In the present embodiment, the first insertion hole 10 and the second insertion hole 11 have a configuration in which the central axes O1 and O2 are positioned on the same diameter and are formed in parallel, but the first insertion hole As shown in FIG. 5, 10 and the second insertion hole 11 may be formed in parallel by shifting the central axes O <b> 1 and O <b> 2.

Alternatively, the first insertion hole 10 and the second insertion hole 11 may be formed with an angle in the longitudinal directions L1 and L2 as shown in FIG.
By forming in this way, the header joint 34 and / or the elbow pipe 35 interfere with each other when the header joint 34 and the elbow pipe 35 attached to the forward tube 3A, 3A and the return tube 3B, 3B, respectively. There is an effect that it can be avoided.

Further, the projecting protrusions 20 and 20 of the divided bodies 21 and 22 may be fastened by bolts 40 and nuts 41 as shown in FIG. 5, or by a binding band 42 or the like as shown in FIG. It may be fixed.
Further, the divided bodies 21 and 22 are divided at any position as long as they can be divided so that the overhanging protrusions 20 and 20, the first insertion hole 10 and the second insertion hole 11 can be divided. May be.

Furthermore, the installation portion 14 shown in FIG. 3 is not formed in an annular shape, but protrudes from two or more spaced locations on the outer peripheral portion of the tube holding portion 13 to be securely locked to the ground around the upper end opening 7t. Any shape can be used.
Furthermore, the tube holding portion 13 shown in FIG. 3 may be formed by appropriately forming an opening hole for introducing a filler for filling the excavation hole 7 in a portion other than the first insertion hole 10 and the second insertion hole 11. Good.

  In the above embodiment, the forward tubes 3A and 3A are inserted into the first insertion hole 10 and the return tubes 3B and 3B are inserted into the second insertion hole 11, but the first insertion hole 10 and the second insertion hole 11 are used. In addition, the forward tube 3A and the return tube 3B may be respectively inserted.

  Moreover, in the said embodiment, although the installation jig 1 was installed on the ground G, you may fix to the upper end opening part 7t vicinity. Moreover, the installation jig 1 may be embedded in the ground G as it is, without removing after installing the underground heat collecting pipe 3 and attaching the header joint 34 and the elbow pipe 35.

DESCRIPTION OF SYMBOLS 1 Underground heat collecting tube installation jig 2 Heat exchanger 3 Underground heat collecting tube 3A Outward tube 3B Return tube 7 Excavation hole 10 1st insertion hole 11 2nd insertion hole 13 Pipe holding part 14 Installation part 20 Overhang | projection protrusion (fixing part) )
21, 22 Divided body 34 Header joint G Ground

Claims (4)

A first insertion hole through which a plurality of tubes are inserted side by side when a plurality of sets of underground heat collection tubes with two tubes of the forward path and the return path are installed in the excavation hole formed in the ground with the axis line in the vertical direction And a tube holding part in which a second insertion hole is formed,
An installation part for installing the pipe holding part in the upper end opening of the excavation hole;
An underground heat sampling tube installation jig characterized by comprising:   The tube holding portion includes a plurality of divided bodies that are connectable on a surface that passes through the first insertion hole and the second insertion hole and extends in a penetrating direction of the first insertion hole and the second insertion hole. The underground heat collecting tube installation jig according to claim 1, wherein:   The underground heat collecting tube installation jig according to claim 2, wherein the divided body has a fixing portion that fixes the divided bodies in a state of being connected to each other on the surface. The underground heat collecting pipe installation jig according to any one of claims 1 to 3, wherein each of the first insertion hole and the second insertion hole formed in the underground heat collection pipe installation jig has the ground. A step of installing in the upper end opening of the excavation hole formed in the ground in a state where the tube constituting the middle heat collecting pipe is inserted;
Inserting a plurality of sets of the underground heat collecting pipes into the excavation hole with the axis line in the vertical direction;
And a step of allowing upper ends of the plurality of tubes to communicate with each other through a header joint.

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