Support pillar and method for embedding heat exchanger

Abstract

To reduce an installation cost of an underground heat exchanger.SOLUTION: A heat exchanger 13 is arranged within an area surrounded by a web part 21 and two flange parts 22, 23 of a steel material 12, and has an elongated shape extending substantially in a vertical direction. A plurality of fixing parts 14a to 14c is arranged spaced apart approximately in the vertical direction within the area surrounded by the web part 21 and the two flange parts 22, 23 of the steel material 12, and fixes the heat exchanger 13 to the steel material 12. A protective part 15 is arranged within the area surrounded by the web part 21 and the two flange parts 22, 23 of the steel material 12, and protects a lower end part of the heat exchanger 13.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a column having a heat exchanger used in a ground heat exchange system and a method for burying the heat exchanger using the same.

Background Art

[0002] Patent Document 1 discloses a ground heat exchanger of a ground heat utilization heat pump system that can be constructed within a soil-cement continuous wall constructed for soil retention to a predetermined depth in the ground. Patent Document 2 discloses a ground heat exchanger using a temporary underground continuous wall.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to further reduce the installation cost of a ground heat exchanger.

Means for Solving the Problems

[0005] The column is a long column that is inserted in a substantially vertical direction into the hole drilled in the ground before the soil-cement formed by mixing the earth and sand generated by the drilling and cement hardens in the hole drilled in the ground in a substantially vertical direction. The column has a web portion and two flange portions, and is a long steel material extending in a substantially vertical direction, a long heat exchanger disposed within a range surrounded by the web portion and the two flange portions of the steel material and extending in a substantially vertical direction, a plurality of fixing portions disposed within the range surrounded by the web portion and the two flange portions of the steel material, arranged at intervals in a substantially vertical direction, for fixing the heat exchanger to the steel material, and a protection portion disposed within the range surrounded by the web portion and the two flange portions of the steel material for protecting the lower end portion of the heat exchanger. The heat exchanger is long and extends in a substantially vertical direction, and has two pipe portions through which a heat medium can flow inside, and a connecting portion that is bent approximately 180 degrees and connects the two pipe portions so that the heat medium can flow at the lower end portion. The fixing portion has a web portion and a flange portion. The web portion of the fixing portion is disposed substantially parallel to the flange portion of the steel material and passes between the two pipe portions of the heat exchanger. The flange portion of the fixing portion is disposed substantially parallel to the web portion of the steel material and on the side opposite to the web portion of the steel material with respect to the two pipe portions of the heat exchanger. The web portion of the fixing portion has a through hole through which a binding band for fixing the two pipe portions of the heat exchanger to the flange portion of the fixing portion passes. The method for embedding a heat exchanger includes a drilling step of drilling a hole extending in a substantially vertical direction in the ground, and a soil-cement forming step of mixing earth and sand generated by the drilling and cement to form soil-cement in the hole drilled in the drilling step in parallel with the drilling step, and a column inserting step of inserting the column extending in a substantially vertical direction into the hole drilled in the drilling step before the soil-cement formed in the soil-cement forming step hardens.

Advantages of the Invention

[0006] According to the column and the method for embedding a heat exchanger, the installation cost of the heat exchanger can be reduced.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0008] Referring to FIG. 1, the support column 10 will be described. The support column 10 is a steel support column in the Soil Mixing Wall (SMW) method. It is inserted in a substantially vertical direction in a hole excavated in the ground before the soil cement formed by mixing the earth and sand generated by excavation and cement hardens. The support column 10 has, for example, a steel material 12, a heat exchanger 13, fixing parts 14a to 14c, and a protection part 15.

[0009] The steel material 12 is in a long shape extending in the ±Z direction (substantially vertical direction). The heat exchanger 13 is in a long shape extending in the ±Z direction, and a heat medium flows inside. The fixing parts 14a to 14c fix the heat exchanger 13 to the steel material 12. The fixing parts 14a to 14c are arranged at intervals in the ±Z direction. The interval between the fixing parts 14a to 14c is, for example, 2000 mm (millimeters). The protection part 15 protects the lower end portion of the heat exchanger 13.

[0010] Referring to FIG. 2, the steel material 12 will be further described. The steel material 12 is, for example, an H-shaped steel, and has a web portion 21, and flange portions 22 and 23. The web portion 21 is disposed substantially perpendicular to the ±Y direction. The flange portions 22 and 23 are disposed substantially perpendicular to the ±X direction. The heat exchanger 13, the fixing portions 14a to 14c, and the protection portion 15 are disposed within a range 24 surrounded by the web portion 21 and the flange portions 22 and 23.

[0011] Referring to FIGS. 3 and 4, the heat exchanger 13 will be further described. The heat exchanger 13 is, for example, a pipe folded at the lower end portion, and has pipe portions 31 and 32, and a connecting portion 33. The pipe portions 31 and 32 are long pipes extending in the ±Z direction. The connecting portion 33 is a pipe bent approximately 180 degrees, and connects the lower end portion of the pipe portion 31 and the lower end portion of the pipe portion 32 so that a heat medium flowing through the pipe portions 31 and 32 can pass through. The connecting portion 33 has a through hole 34. The through hole 34 is for attaching an annular portion 58 (see FIGS. 7 and 8) described later.

[0012] Referring to FIGS. 5 and 6, the fixing portion 14a will be further described. Note that the fixing portions 14b and 14c are the same as the fixing portion 14a, and thus the description thereof will be omitted. The fixing portion 14a is, for example, an I-shaped steel, and has a web portion 41, and flange portions 42 and 43.

[0013] The web portion 41 is disposed substantially perpendicular to the ±X direction. The pipe portions 31 and 32 of the heat exchanger 13 are disposed on opposite sides of each other with the web portion 41 interposed therebetween. That is, the web portion 41 passes between the pipe portion 31 and the pipe portion 32 of the heat exchanger 13. The flange portions 42 and 43 are disposed substantially perpendicular to the ±Y direction. The flange portion 42 is fixed to the web portion 21 of the steel material 12. The flange portion 43 is disposed on the side opposite to the web portion 21 of the steel material 12 with respect to the pipe portions 31 and 32 of the heat exchanger 13.

[0014] The web part 41 has a through-hole 44. The through-hole 44 is for passing the binding band 45. The binding band 45 passes through the through-hole 44 and is bound around the pipe parts 31 and 32 of the heat exchanger 13 and the flange part 43, thereby fixing the pipe parts 31 and 32 of the heat exchanger 13 to the flange part 43. Since the pipe parts 31 and 32 are fixed to the flange part 43 using the binding band 45, the pipe parts 31 and 32 can be firmly fixed. As a result, even if the interval between the fixing parts 14a to 14c is wide, the pipe parts 31 and 32 can be firmly held, and the cost can be suppressed.

[0015] With reference to FIGS. 7 and 8, the protection part 15 will be further described. The protection part 15 has, for example, a cover part 51, a rod part 57, and a ring part 58.

[0016] The cover part 51 is, for example, a bent steel plate and defines a protection space 56. The protection space 56 protects the connection part 33 of the heat exchanger 13. The cover part 51 has, for example, a parallel part 52, an inclined part 53, and side parts 54 and 55.

[0017] The parallel part 52 is, for example, in the shape of a rectangular plate and is arranged substantially perpendicular to the ±Y direction. The inclined part 53 is, for example, in the shape of a rectangular plate, is adjacent to the -Z side of the parallel part 52, and is arranged inclined in the +Y direction with respect to the ±Y direction. The inclined part 53 has its -Z side end in contact with the web part 21 of the steel material 12. Thus, when the support column 10 is inserted into the soil cement, the soil cement is pushed away in a direction away from the web part 21, forming a space into which the heat exchanger 13 can be inserted. Therefore, it is only necessary to secure a protection space 56 of a minimum size, and it is not necessary to cover the entire heat exchanger 13, so the cost can be suppressed. The side part 54 is, for example, in the shape of a trapezoidal plate, is adjacent to the -X side of the parallel part 52 and the inclined part 53, and is arranged substantially perpendicular to the ±X direction. The side part 54 is, for example, in the shape of a trapezoidal plate, is adjacent to the +X side of the parallel part 52 and the inclined part 53, and is arranged substantially perpendicular to the ±X direction.

[0018] The rod portion 57 is, for example, a bolt and is elongated extending in the ±X directions within the protection space 56. The rod portion 57 is inserted through through-holes provided in the side portions 54 and 55, for example, and fixed to the cover portion 51.

[0019] The ring portion 58 is, for example, a shackle and fixes the connection portion 33 of the heat exchanger 13 to the rod portion 57. For example, the ring portion 58 is attached to the connection portion 33 by inserting the ring portion 58 through a through-hole 34 provided in the connection portion 33 of the heat exchanger 13, and further, by inserting the rod portion 57 through the ring portion 58, the connection portion 33 is fixed to the rod portion 57 via the ring portion 58.

[0020] Referring to FIG. 9, the heat exchanger embedding process 60 will be described. In the heat exchanger embedding process 60, the heat exchanger 13 is buried and installed in the ground. The heat exchanger embedding process 60 includes, for example, a drilling step 61, a soil cement forming step 62, a support inserting step 63, and a soil cement hardening step 64.

[0021] In the drilling step 61, a hole extending in a substantially vertical direction is drilled in the ground. In the soil cement forming step 62, in parallel with the drilling step 61, within the hole drilled in the drilling step 61, soil and sand generated by the drilling and cement are mixed to form soil cement. In the support inserting step 63, before the soil cement formed in the soil cement forming step 62 hardens, the support 10 is inserted into the hole drilled in the drilling step 61. In the soil cement hardening step 64, the soil cement is hardened to create a pile or wall in which the heat exchanger 13 is buried.

[0022] When the support column 10 is inserted into the hole in the soil cement forming step 62, the heat exchanger 13 is inserted into the hole together with the steel material 12. Although the hole is filled with soil cement, since the inclined portion 53 of the protection part 15 pushes the soil cement away from the web part 21, a space for the heat exchanger 13 to enter is formed. The soil cement pushed away from the web part 21 by the inclined portion 53 is pushed out of the range 24 as it is, so it is not necessary to protect the entire heat exchanger 13, and only the lower end portion needs to be protected, and the protection member can be saved.

[0023] Also, instead of providing an inclined portion at the lower end portion of the entire range 24, since the protection part 15 is provided only at the lower end portion of the heat exchanger 13 located within the range 24, the protection part 15 can be made smaller and the cost can be suppressed. Specifically, the horizontal cross-sectional area of the protection space 56 defined by the protection part 15 may be about 5 times or more and 10 times or less the horizontal cross-sectional area of the heat exchanger 13. For example, when the outer diameters of the pipe parts 31 and 32 of the heat exchanger 13 are 34 mm, the horizontal cross-sectional area of the heat exchanger 13 is about 1820 mm 2 is. On the other hand, if the horizontal cross-sectional area of the protection space 56 is, for example, 150 mm × 75 mm = 11250 mm 2 it becomes about 6.2 times the horizontal cross-sectional area of the heat exchanger 13.

[0024] After securing a space into which the heat exchanger 13 can be inserted by the protection part 15 in the support column insertion step 63, since the soil cement has fluidity until the soil cement hardens in the soil cement hardening step 64, the soil cement enters the secured space and adheres to the heat exchanger 13. Therefore, heat exchange between the heat exchanger 13 and the ground is not hindered.

[0025] The embodiments described above are examples for facilitating the understanding of the present invention. The present invention is not limited thereto, and includes those that are variously modified, changed, added, or removed without departing from the scope defined by the appended claims. This can be easily understood by those skilled in the art from the above description.

[0026] The construction methods of the ground heat exchanger, which is essential for a closed-loop ground heat utilization system, mainly include a method of constructing the ground heat exchanger in a dedicated ground heat exchange well and a method of constructing the ground heat exchanger concurrently with the building pile foundation. In order to reduce the construction period and cost, by constructing the ground heat exchanger concurrently with the steel pipe columns of the SMW method (soil mixing wall method) constructed during the building excavation work, a dedicated ground heat exchange well is no longer required, and it is no longer limited to the building's foundation structure. In order to lay the ground heat exchanger in the steel pipe columns in advance, I-shaped fittings and lower-end protection materials are prepared in the steel pipe columns in advance. The number of I-shaped fittings shall be the minimum required for the ground heat exchanger, and the interval shall be 2000 mm or less at maximum. The lower-end protection material shall be of the minimum shape that matches the shape of the ground heat exchanger, and the lower-end support shall be about 1000 mm. A heat preservation cylinder is provided at the upper end for protection. By simplifying the installation of the ground heat exchanger with a binding band for the I-shaped fitting and a shackle for the lower-end protection material, the labor cost and construction period can be reduced. The installation time of the ground heat exchanger can be rationalized by performing it in sequence during the erection of the steel pipe columns. The lower-end protection material serves both to prevent damage to the lower end of the ground heat exchanger when the steel pipe column is dropped and to prevent floating due to the difference in specific gravity between the SMW soil cement and the ground heat exchanger.

Explanation of Signs

[0027] 10 Column, 12 Steel material, 21, 41 Web part, 22, 23, 42, 43 Flange part, 24 Range, 13 Heat exchanger, 31, 32 Pipe part, 33 Connection part, 34, 44 Through hole, 14a~14c Fixing part, 45 Binding band, 15 Protection part, 51 Cover part, 52 Parallel part, 53 Inclined part, 54, 55 Side part, 56 Protection space, 57 Rod part, 58 Ring part, 60 Heat exchanger embedding process, 61 Hole drilling process, 62 Soil cement forming process, 63 Column insertion process, 64 Soil cement hardening process.

Claims

1. A long column that is inserted in a substantially vertical direction into a hole drilled in the ground, before the soil cement formed by mixing the earth and sand generated by the drilling and cement hardens, the column comprising: a long steel material having a web portion and two flange portions and extending in a substantially vertical direction; a long heat exchanger disposed within a range surrounded by the web portion and the two flange portions of the steel material and extending in a substantially vertical direction; a plurality of fixing portions that are arranged at intervals in a substantially vertical direction within the range surrounded by the web portion and the two flange portions of the steel material and fix the heat exchanger to the steel material; a protection portion that is disposed within the range surrounded by the web portion and the two flange portions of the steel material and protects a lower end portion of the heat exchanger; and comprising; the heat exchanger: is long and extends in a substantially vertical direction, and has two pipe portions through which a heat medium can flow inside; is bent approximately 180 degrees, and has a connecting portion that connects the two pipe portions so that the heat medium can flow at a lower end portion; and has; the fixing portion has a web portion and a flange portion; the web portion of the fixing portion is disposed substantially parallel to the flange portion of the steel material, passes between the two pipe portions of the heat exchanger, the flange portion of the fixing portion is disposed substantially parallel to the web portion of the steel material and on the side opposite to the web portion of the steel material with respect to the two pipe portions of the heat exchanger; the web portion of the fixing portion has a through hole through which a binding band that fixes the two pipe portions of the heat exchanger to the flange portion of the fixing portion passes; a column.

2. The protection portion: comprises a cover portion that is fixed to the web portion of the steel material and defines a protection space for protecting the connecting portion of the heat exchanger; a long bar portion that is fixed to the cover portion and extends in a substantially horizontal direction within the protection space; and a ring portion that fixes the connecting portion of the heat exchanger to the bar portion; and has; the column according to Claim 1.

3. When the column is inserted into the hole, the cover portion pushes back the soil cement in a direction away from the web portion of the steel material; the column according to Claim 2.

4. The horizontal cross-sectional area of the protection space defined by the protection portion is 5 times or more and 10 times or less the horizontal cross-sectional area of the heat exchanger; the column according to Claim 2 or 3.

5. A hole drilling step of drilling a hole extending in a substantially vertical direction in the ground; In parallel with the hole boring process, a soil-cement forming process for forming soil-cement by mixing the earth and sand generated by excavation and cement in the hole excavated in the hole boring process; Before the soil-cement formed in the soil-cement forming process hardens, a column inserting process of inserting a column according to any one of claims 1 to 3 extending in a substantially vertical direction into the hole excavated in the hole boring process Comprising Heat exchanger embedding method.

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