JP2023038435A - Underground heat accumulation method - Google Patents
Underground heat accumulation method Download PDFInfo
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- JP2023038435A JP2023038435A JP2021145149A JP2021145149A JP2023038435A JP 2023038435 A JP2023038435 A JP 2023038435A JP 2021145149 A JP2021145149 A JP 2021145149A JP 2021145149 A JP2021145149 A JP 2021145149A JP 2023038435 A JP2023038435 A JP 2023038435A
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- antifreeze
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000009825 accumulation Methods 0.000 title abstract 3
- 238000007710 freezing Methods 0.000 claims abstract description 12
- 230000008014 freezing Effects 0.000 claims abstract description 11
- 230000002528 anti-freeze Effects 0.000 claims description 30
- 239000004576 sand Substances 0.000 claims description 24
- 238000005338 heat storage Methods 0.000 claims description 22
- 230000001681 protective effect Effects 0.000 claims description 17
- 239000002689 soil Substances 0.000 claims description 9
- 230000001629 suppression Effects 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 23
- 230000002265 prevention Effects 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 244000144972 livestock Species 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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Abstract
Description
本開示は、土中蓄熱工法に関する。 The present disclosure relates to an underground heat storage method.
下記特許文献１に記載されているように、地盤の凍上を防止する凍上防止方法が提案されている。 As described in Patent Literature 1 below, a frost heave prevention method for preventing frost heave of the ground has been proposed.
特許文献１では、置換工法、断熱工法、土質改良法、薬剤工法、遮水工法といった凍上防止方法の課題を解決するため、遮水シートを用いた凍上防止方法を提案している。 Patent Document 1 proposes a frost heave prevention method using a seepage control sheet in order to solve the problems of frost heave prevention methods such as a replacement method, a heat insulation method, a soil improvement method, a chemical method, and a seepage control method.
本開示は、遮水シートを用いることなく地盤の凍上を抑制することが可能な土中蓄熱工法を提供することを目的とする。 An object of the present disclosure is to provide an underground heat storage method capable of suppressing ground frost heaving without using a waterproof sheet.
本開示は、土中蓄熱工法であって、不凍液を加温し、凍結抑制領域に埋設されたパイプに加温した不凍液を循環させる。 The present disclosure is an underground heat storage method that heats an antifreeze solution and circulates the heated antifreeze solution through pipes embedded in a freeze suppression area.
本開示によれば、遮水シートを用いることなく地盤の凍上を抑制することが可能な土中蓄熱工法を提供することができる。 Advantageous Effects of Invention According to the present disclosure, it is possible to provide an underground heat storage method capable of suppressing frost heaving of the ground without using a waterproof sheet.
以下、添付図面を参照しながら本実施形態について説明する。説明の理解を容易にするため、各図面において同一の構成要素に対しては可能な限り同一の符号を付して、重複する説明は省略する。 Hereinafter, this embodiment will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same constituent elements in each drawing are denoted by the same reference numerals as much as possible, and overlapping descriptions are omitted.
本実施形態に係る土中蓄熱工法は、凍結抑制領域に埋設されたパイプに加温した不凍液を循環させるものである。例えば、冬期に土壌の凍上が問題となるような地域において、家畜を収容する建物を建てて春に引き渡すような場合、引き渡した後には家畜等が収容されて熱源も稼働するため建物内部の温度が上昇して凍上が問題とならなくなる。この場合でも、引き渡し前には凍上を抑制する必要がある。従来から凍上防止方法は様々なものが提案されているが、本実施形態に係る土中蓄熱工法は一時的な凍上抑制を目的としているため、より簡便な工法であることが求められる。 The underground heat storage method according to the present embodiment circulates heated antifreeze liquid through pipes buried in the freeze suppression area. For example, in an area where soil frost heaving is a problem in winter, if a building to house livestock is built and handed over in the spring, after handing over, livestock, etc. will be housed and the heat source will also be operating, so the temperature inside the building will increase. will rise and frost heave will no longer be a problem. Even in this case, it is necessary to suppress frost heave before delivery. Various frost heave prevention methods have been proposed in the past, but since the soil heat storage method according to the present embodiment is intended to temporarily suppress frost heave, it is required to be a simpler method.
このような背景に鑑みて、本実施形態に係る土中蓄熱工法は、不凍液を加温し、凍結抑制領域に埋設されたパイプに加温した不凍液を循環させるものである。不凍液の加温は公知のボイラーが用いられる。不凍液の循環には公知のポンプが用いられる。ボイラーによって加温された不凍液は、パイプに送り出される。パイプは循環経路を形成しており、凍結抑制領域の凍上を抑制できるように配置されている。 In view of such a background, the underground heat storage method according to the present embodiment heats the antifreeze and circulates the heated antifreeze through pipes embedded in the freeze suppression area. A known boiler is used to heat the antifreeze. A known pump is used to circulate the antifreeze. The antifreeze heated by the boiler is pumped into the pipe. The pipes form a circulation path and are arranged so as to suppress frost heaving in the freeze suppression area.
ボイラーによって加温した不凍液を循環させるのは凍上が懸念される時期になる。一例としては、前年の日平均気温が零度以下となる日を基準として、不凍液の加温循環タイミングを決めることができる。また、ポンプを駆動して不凍液は常時循環させ、不凍液の温度が設定温度よりも低くなると見込まれた場合又は不凍液の温度が設定温度よりも低くなった場合にボイラーを稼働させて加温してもよい。不凍液の温度は、様々な方法によって測定したり推定したりすることができる。例えば、土中の温度を測定し、その測定温度から不凍液の温度を推定することができる。例えば、ボイラーに設置された水温センサで不凍液の温度を測定することができる。例えば、土中の温度測定結果と水温センサにおける温度測定結果とを組み合わせて、不凍液の温度を推定したり測定したりすることができる。 Circulating the antifreeze heated by the boiler is the time when frost heaving is a concern. As an example, the antifreeze liquid heating and circulation timing can be determined based on the day on which the average daily temperature of the previous year is 0°C or lower. In addition, the pump is driven to constantly circulate the antifreeze liquid, and when the temperature of the antifreeze liquid is expected to fall below the set temperature or when the temperature of the antifreeze liquid is lower than the set temperature, the boiler is operated to heat it. good too. Antifreeze temperature can be measured or estimated by a variety of methods. For example, the temperature in the soil can be measured and the antifreeze temperature can be estimated from the measured temperature. For example, a water temperature sensor installed in the boiler can measure the temperature of the antifreeze. For example, it is possible to estimate or measure the temperature of the antifreeze liquid by combining the temperature measurement result of the soil and the temperature measurement result of the water temperature sensor.
図１を参照しながら、本実施形態に係る土中蓄熱工法について説明を続ける。凍結抑制領域である屋内には、表面側から順に、土間表面１０、土砂層１２、保護砂層１４、地盤層１６が設けられている。土間表面１０は、コンクリートの表面層である。土砂層１２は、土砂及び石を含む層である。
The underground heat storage method according to this embodiment will be described with reference to FIG. An
保護砂層１４は、地盤層１６にパイプＰを配置し、その上に２００ｍｍ程度の砂層として形成されている。パイプＰに加温された不凍液が流れると、パイプＰの周辺では土壌の凍結が回避される。図示されているように、凍結領域Ｆは、建物外部では地表面まで達して凍上状態となっている。凍結領域Ｆは、パイプＰの周辺では保護砂層１４に到達しないようになっているが、隣接するパイプＰの間では保護砂層１４内に到達している。保護砂層１４は、凍結領域Ｆが侵入してきても更に土砂層１２及び土間表面１０を持ち上げようとする力を発生させないように、砂の可塑的な性状で分散させている。このような分散性能を発揮させるため、保護砂層１４は、１００ｍｍから３００ｍｍ程度の厚さとすることが好ましい。
The
パイプＰの埋設位置は、土間表面１０から６５０ｍｍ程度となっている。パイプＰの埋設位置は、設置地域の凍結深度に応じて適宜設定される。例えば、標準的な凍結深度が１２００ｍｍとされている地域の場合、異常気象年も考慮して凍結深度を１３００ｍｍと設定し、中間深度の６５０ｍｍをパイプＰの埋設位置とする。地表面近くにパイプＰを埋設すると、熱が土間表面１０から放熱されてしまい熱を帯びた層が薄くなってしまうため、凍結深度に応じた位置にパイプＰを配置することが好ましい。
The buried position of the pipe P is about 650 mm from the
上記説明したように、本実施形態に係る土中蓄熱工法は、不凍液を加温し、凍結抑制領域に埋設されたパイプに加温した不凍液を循環させる。 As described above, the underground heat storage method according to the present embodiment heats the antifreeze and circulates the heated antifreeze through the pipes embedded in the freeze suppression area.
本実施形態に係る土中蓄熱工法では、凍結抑制領域の凍結開始タイミングよりも前に不凍液を循環させる。 In the underground heat storage method according to the present embodiment, the antifreeze is circulated before the freezing start timing of the freeze suppression area.
本実施形態に係る土中蓄熱工法では、凍結開始タイミングは、凍結抑制領域における過去の気温情報から決定される。 In the underground heat storage method according to the present embodiment, the freezing start timing is determined from the past temperature information in the freezing suppression area.
本実施形態に係る土中蓄熱工法では、不凍液の温度が設定温度よりも低くなると見込まれた場合又は不凍液の温度が設定温度よりも低くなった場合に加温する。 In the underground heat storage method according to the present embodiment, heating is performed when the temperature of the antifreeze is expected to be lower than the set temperature or when the temperature of the antifreeze is lower than the set temperature.
本実施形態に係る土中蓄熱工法では、凍結抑制領域の土中に保護砂層を設け、保護砂層内又は保護砂層よりも下層にパイプを埋設する。 In the soil heat storage method according to the present embodiment, a protective sand layer is provided in the soil of the freeze suppression area, and the pipe is buried in the protective sand layer or in a layer below the protective sand layer.
本実施形態に係る土中蓄熱工法では、保護砂層は、少なくとも１００ｍｍの深さを有するように設けられている。 In the underground heat storage method according to this embodiment, the protective sand layer is provided to have a depth of at least 100 mm.
本実施形態に係る土中蓄熱工法では、保護砂層の下端にパイプが埋設されている。 In the underground heat storage method according to this embodiment, a pipe is buried in the lower end of the protective sand layer.
以上、具体例を参照しつつ本実施形態について説明した。しかし、本開示はこれらの具体例に限定されるものではない。これら具体例に、当業者が適宜設計変更を加えたものも、本開示の特徴を備えている限り、本開示の範囲に包含される。前述した各具体例が備える各要素およびその配置、条件、形状などは、例示したものに限定されるわけではなく適宜変更することができる。前述した各具体例が備える各要素は、技術的な矛盾が生じない限り、適宜組み合わせを変えることができる。 The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Design modifications to these specific examples by those skilled in the art are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each specific example described above and its arrangement, conditions, shape, etc. are not limited to those illustrated and can be changed as appropriate. As long as there is no technical contradiction, the combination of the elements included in the specific examples described above can be changed as appropriate.
Ｐ：パイプ
Ｆ：凍結領域
１０：土間表面
１２：土砂層
１４：保護砂層
１６：地盤層
P: Pipe F: Frozen area 10: Dirt surface 12: Sand layer 14: Protective sand layer 16: Ground layer
Claims (7)
不凍液を加温し、
凍結抑制領域に埋設されたパイプに加温した不凍液を循環させる。 An underground heat storage method,
heat the antifreeze,
Heated antifreeze is circulated through the pipes embedded in the antifreeze area.
前記凍結抑制領域の凍結開始タイミングよりも前に不凍液を循環させる。 The underground heat storage method according to claim 1,
The antifreeze liquid is circulated before the freezing start timing of the antifreeze region.
前記凍結開始タイミングは、前記凍結抑制領域における過去の気温情報から決定される。 The underground heat storage method according to claim 2,
The freezing start timing is determined from past temperature information in the anti-freezing region.
不凍液の温度が設定温度よりも低くなると見込まれた場合又は不凍液の温度が設定温度よりも低くなった場合に加温する。 The underground heat storage method according to any one of claims 1 to 3,
When the temperature of the antifreeze is expected to be lower than the set temperature or when the temperature of the antifreeze is lower than the set temperature, it is heated.
前記凍結抑制領域の土中に保護砂層を設け、前記保護砂層内又は前記保護砂層よりも下層に前記パイプを埋設する。 The underground heat storage method according to any one of claims 1 to 4,
A protective sand layer is provided in the soil of the freeze suppression area, and the pipe is buried in the protective sand layer or in a layer below the protective sand layer.
前記保護砂層は、少なくとも１００ｍｍの深さを有するように設けられている。 The underground heat storage method according to claim 5,
Said protective sand layer is provided to have a depth of at least 100 mm.
前記保護砂層の下端に前記パイプが埋設されている。 The underground heat storage method according to claim 5 or 6,
The pipe is embedded in the lower end of the protective sand layer.
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