JP4625726B2 - Piping burial structure for heat exchange of underground heat storage system and burial method - Google Patents

Description

  The present invention provides a structure in which a large number of heat exchanging pipes for reciprocating a heat medium of an underground heat storage system are buried in the ground, and a method for burying the ground, which also serves as a countermeasure for ground liquefaction or an increase in support capacity of a building or the like It belongs to the technical field, and more specifically, for heat exchange of large-scale (large-capacity) underground heat storage systems in which a large number of heat exchanging pipes are embedded by effectively utilizing a wide ground improvement body including the lower ground of the structure. The present invention relates to a pipe burying structure and a burying method thereof.

  Conventionally, by utilizing the heat capacity of the ground, for example, waste heat (heat) with little utility value can be stored in the ground during the daytime or summer, and used as a heat source for nighttime or winter heating, or for melting snow in the wintertime. It has been broken. On the other hand, cold energy at night and winter is stored and used for cooling in the daytime and summer, which is used to save energy and reduce environmental impact. For example, the underground heat storage system shown in FIG. 11 embeds a large number of heat exchange pipes a for reciprocating a heat medium in the lower ground of the structure b, and stores and uses hot or cold heat in the ground. Each of the heat exchange pipes a is connected at its end to a water supply pipe c and a return water pipe d, and the water supply pipe c and the return water pipe d are connected to each floor via a heat exchanger e and a heat source machine f. Are connected to a water cooling device (cooling tower) h installed on the roof. In addition, when implementing what is called a cogeneration facility which uses again the thermal energy generated in the time of electric power generation for electric power generation, the said water pipe c and the return water pipe d are connected to a generator and a boiler instead of the heat exchanger e.

  In order to implement the underground heat storage system as illustrated, various heat exchanging pipe embedding structures and methods for embedding and using hot or cold heat in the ground have been developed and put into practical use. For example, the following Patent Document 1 discloses a structure embedded in a closed space formed on a soil cement steel underground continuous wall in which heat exchanging piping is used for ground excavation work of a structure. . Patent Document 2 discloses a structure embedded in a cast-in-place concrete pile in which a heat exchange pipe formed in a spiral shape is embedded, and a method for burying the structure.

JP 2004-101115 A JP 2004-324913 A

  In the underground heat storage system disclosed in Patent Documents 1 and 2, the heat exchanging pipe burying structure and the embedding method do not require excavation of the ground in order to embed the heat exchanging pipe. It can be noticed in that it can reduce the burden. However, the soil cement steel underground continuous wall described in Patent Document 1 is usually constructed in an arrangement that becomes the outer peripheral portion of the structure. For this reason, the heat exchange pipes are installed only on the outer periphery of the lower ground of the structure, and since the applicable range (area) is narrow, the number and position of the heat exchange pipes are limited, and sufficient heat or cold is stored. It is not possible and usage efficiency is bad. Similarly, the heat exchanging pipe embedment structure of Patent Document 2 also has a narrow application range (area) because the number and position of the heat exchanging pipe depends on the number and position of cast-in-place concrete piles. ineffective.

  The object of the present invention is to effectively utilize a ground improvement body constructed on a ground subject to large underground heat storage including the lower ground of the structure, which also serves as a countermeasure for liquefaction of the ground or an increase in support capacity of a building or the like. It is to provide a heat exchange pipe burying structure and a burying method for a necessary and sufficiently large-scale (large capacity) underground heat storage system in which many heat exchange pipes are buried.

  The next object of the present invention is a piping structure for heat exchange of an underground heat storage system of a sufficiently large and large scale (large capacity), and the scale is divided (divided into system blocks) for efficient It is to provide a heat exchanging pipe burying structure and its burying method that can realize an underground heat storage system excellent in usability.

As means for solving the above-mentioned problem, the underground piping structure for heat exchange of the underground heat storage system according to the invention described in claim 1 is :
In a structure in which a number of heat exchange pipes 1 for reciprocating the heat medium of the underground heat storage system are buried in the ground,
Before the ground improvement work is carried out on the ground 4 subject to underground heat storage and the improved body 2 that has been formed is consolidated , a substantially U-shaped heat exchange pipe into the inner side improved body 2 excluding the outermost peripheral part. 1 by repeating the steps of embedding and pushing a 1 ... a number of pipe heat exchanger, characterized in that it is buried into the ground.

The underground heat storage system burial structure for heat exchange according to the invention described in claim 2 is:
In a structure in which a number of heat exchange pipes 1 for reciprocating the heat medium of the underground heat storage system are buried in the ground,
The ground improvement work is in the shape of a wall where the ground improvement work continues on the target ground 4 and the outermost wall-like part is closed in plan view. Before the improvement body 2 is solidified, it is approximately U-shaped. The heat exchanging pipe 1 is pushed into the wall-like improvement body 2 and embedded, and a large number of heat exchanging pipes 1 are buried in the ground.

The underground structure for heat exchange of the underground heat storage system according to the invention described in claim 3 is:
In the structure where many heat exchanging pipes that recirculate the heat medium of the underground heat storage system are buried in the ground,
The ground improvement work is applied to the ground 4 subject to underground heat storage in the shape of a wall that continues in a lattice arrangement in plan view, and the heat exchange pipe 1 having a substantially U shape is formed before the improved body 2 is consolidated. The process of pushing and embedding into the wall-shaped improvement body 2 is repeated, and a large number of heat exchange pipes 1 are buried in the ground.

The invention described in claim 4 is the pipe-buried structure for heat exchange of the underground heat storage system according to claim 2 or 3 ,
A large number of heat exchange pipes 1 are embedded in the inner wall-like improvement body 2 excluding the outermost wall-like portion of the created improvement body 2.

The invention described in claim 5 is the pipe-buried structure for heat exchange of the underground heat storage system according to claim 2 or 3 ,
Among the improved bodies 2 formed in a continuous wall shape, the improved body 2 forming the outermost wall-shaped portion and the meshes defined inside thereof is formed to a depth reaching the hardly water-permeable layer 8. The ground in the outer perimeter is formed in the heat insulating layer 3a by lowering the groundwater level.

The invention described in claim 6 is the pipe-buried structure for heat exchange of the underground heat storage system described in claim 2 or 3 ,
Among the meshes 3 defined by the continuous improvement body 2 formed in a continuous wall shape, the improvement body 2 forming the meshes 3 selected for a plurality of continuous arrangements is formed to a depth reaching the hardly permeable layer 8; The ground in the grid 3 is formed in the heat insulating layers 3b and 3c by lowering the groundwater level, and the improved body 2 divided by the heat insulating layers 3b and 3c and the heat exchanging pipe group 1 embedded therein It is divided into a plurality of system blocks 9, 10 and 11 to 14, and is configured to be able to use the heat exchanging pipe group 1 for each system block for underground heat storage.

The underground heat storage system burying method for heat exchange according to the invention described in claim 7 is:
In a method of burying a large number of heat exchanging pipes 1 for reciprocating the heat medium of the underground heat storage system in the ground,
The ground improvement work on the ground 4 subject to underground heat storage is made into a continuous wall shape, and the outermost wall-like portion is constructed in a closed shape in plan view, and before the improved body 2 is solidified, it is substantially U-shaped. The heat exchanging pipe 1 is pushed into the wall-like improvement body 2 and buried, and a large number of heat exchanging pipes 1 are buried in the ground.

According to the underground heat storage system heat exchanging pipe embedment structure and the embedment method according to claims 1, 2 , 3, and claim 7 , the ground liquefaction countermeasures, or an increase in support capacity of buildings, etc. A large number of heat exchange pipes 1 are buried in the ground 4 of the target ground 4 for the wide underground heat storage including the lower ground of the structure 7, so that a simple and easy method is necessary and efficient. A sufficiently large-scale (large-capacity) heat exchange piping buried structure can be realized.

According to the underground heat storage system burial structure and the burial method of the underground heat storage system according to claims 2 , 3 and 7 , the heat exchange pipe 1 is placed in the ground improvement body 2 formed into a continuous wall shape. Since a large number of burials are buried, a large-scale heat exchanging pipe burial structure of the underground heat storage system can be realized.

In addition, according to the heat exchanging pipe embedded structure of the underground heat storage system according to the first, fourth, and fifth aspects of the present invention, the outermost improved body portion or the wall-shaped portion 2a of the improved body 2 is As the heat insulating wall 2a that blocks the entry / exit of the water, or the formation of the outermost mesh 3 is used as the heat insulating layer 3a, it is possible to efficiently store heat or cold, and to improve the utilization efficiency.

Further, according to the underground heat storage system heat exchanging pipe embedment structure according to the sixth aspect of the present invention, a plurality of contiguous arrangements are selected from among the meshes defined by the improved body formed into a continuous wall shape. Since the formation of the eye is formed into a heat insulation layer and the large-scale heat exchanging piping embedded structure is divided into a plurality of system blocks, one system block is used for heat storage, and the other system block is used for storage of cold heat. It can be used properly for various heat storage systems such as this, and an efficient and easy-to-use underground heat storage system can be realized.

  Repeat the process of constructing the ground improvement work on the target ground 4 for underground heat storage, and pushing and embedding the substantially U-shaped heat exchange pipe 1 into the improved body 2 before the improved body consolidated. A large number of heat exchange pipes 1 are buried in the ground.

Hereinafter, the present invention will be described based on illustrated embodiments.
FIG. 1A shows an embodiment of the invention described in claims 2, 3 and 7 . In particular, in order to prevent ground liquefaction or to increase the support capacity of buildings, etc., the outermost wall-like part in a plan view is closed, and the ground is improved into a wall that is continuous in a grid pattern. The Example of the piping burial | buried structure for heat exchange of the underground thermal storage system where construction was constructed is shown. Reference numeral 3 in the figure indicates a square or unimproved ground strata partitioned by a wall-shaped ground improvement body 2.

  In the embodiment of FIG. 1 (A), the ground improvement work is applied to the target ground 4 for underground heat storage in the shape of a wall that is continuous in a lattice arrangement in plan view, and the created improved body 2 is consolidated. Previously, as shown in detail in FIG. 2, the substantially U-shaped heat exchange pipe 1 is pushed into the improved body 2 so that the upper part of the heat exchange pipe 1 remains on the ground surface. Are repeated, and a large number of heat exchange pipes 1 are embedded in order in a wall-like improved body 2. Here, the target ground 4 for underground heat storage generally refers to the foundation ground directly under the building as shown in FIG. 11, but may be an arbitrary place on the ground in the site.

  The above ground improvement work is usually performed using a conventionally known ground improvement machine 5 shown in FIG. As shown in (b) to (d) of FIG. 3 (B) in order of the important steps of the ground improvement work, it also served the purpose of securing liquefaction countermeasures or the support function of the building (however, it also served the purpose) This is not a necessary condition.) The ground is improved by a well-known deep mixing method or a soil mixing wall method. Improving the soft ground to a depth of about 10m to 20m with the ground improvement machine 5, injecting a stabilizer such as cement milk into the original excavated soil, mixing and stirring, and improving the columnar ground with partly wrapped The body 2 is created for each of the stirring blade shafts 6. It takes time for the stabilizer such as cement milk to harden, and immediately after the ground improvement body 2 is formed, it remains soft for a while. Therefore, at the stage where the ground improvement body 2 is still soft, there are two or more pieces in the columnar ground improvement body 2 in the uncured state formed as described above (or two or more depending on the number of columnar rows). ) Push in the heat exchange pipe 1 and embed it. Incidentally, the pushing of the heat exchanging pipe 1 is not specifically shown, but a reinforcing material is attached to the lower end of the substantially U-shaped heat exchanging pipe 1 and an additional weight is provided on the reinforcing material. For example, a steel material such as an H-shaped steel is placed as an object, and a protective material for preventing deformation of the pipe body is attached, forcibly and quickly. The heat exchanging pipe 1 may be U-shaped as a whole having a forward path and a return path through which the heat medium reciprocates, and may be, for example, a U-shape or an H-shape.

  By repeating the above-described steps, the ground improvement body 2 can be made continuous in a wall shape, and the number of embedded heat exchange pipes 1 can be increased to a row arrangement. Therefore, it is possible to easily realize a large-scale or large-capacity heat exchange pipe embedded structure in which a necessary and sufficient number of heat exchange pipes 1 are embedded in accordance with the scale of ground improvement work.

  Incidentally, as a method of using the large-scale heat exchanging pipe buried structure shown in FIG. 1 (A), in addition to the case of using the entire surface uniformly, as shown in the schematic diagram of FIG. 1 (B), The heat exchanging pipe shown in FIG. 1A is divided into, for example, four areas 15 to 18, and first, underground heat storage is performed in the area 15, and the ground around the heat exchanging pipe 1 and the same heat exchanging pipe 1. When the temperature difference between the two is smaller, the underground heat storage is performed in the region 16 and then the regions 15 to 18 are appropriately used as in the region 17 and the region 18 so that the heat exchange is performed. Efficiency can also be increased.

But the embodiment of the said heat exchanging pipe | burr embedded structure is not restricted to the system shown in FIG. Depending on the shape of the site, the shape of the target ground 4 for underground heat storage, the liquefaction countermeasure of the ground, or the enhancement of the support capacity of the building, etc., the outermost wall-like part is closed in plan view, for example Shaped, triangular (see FIG. 4A), square (see FIG. 4B), honeycomb (see FIG. 4C), circular or elliptical (see FIG. 4D) ) Can be implemented in a wide variety. Alternatively, it can be implemented in an open shape such as a cross-girder shape in plan view, which does not have an outermost closed wall-shaped portion (see FIG. 5).
Furthermore, an extreme example is not limited to the construction how continuous in a wall shape, as shown in FIG. 6, the entire surface improvement of facilities Engineering for continuous improvement body surface (the invention of claim 1 Symbol placement) It can also be implemented. In this case, the heat exchanging pipe 1 is not limited to being embedded in the illustrated matrix arrangement. Depending on the convenience of the underground heat storage system or the use form of the ground, it may be embedded in a grouped arrangement dispersed in several groups.

FIG. 7 shows an embodiment of the invention described in claim 4 . In particular, out of the improved body 2 in which the heat exchanging pipe 1 is formed in a wall shape in which the plan view described above is continuous in a lattice arrangement, the inner wall-shaped improved body 2 excluding the outermost wall-shaped portion is entered. In order, a large number of heat exchange pipes 1 are buried. In the embodiment, the heat exchanging pipe 1 is not embedded in the outermost wall-like portion, and the heat insulating wall 2a is configured. As a result, underground heat storage is performed in the inner wall-shaped improvement body 2 surrounded by the heat insulating wall 2a, so that the underground heat storage can be prevented from entering and exiting due to the groundwater flow or the like (heat loss), and the heat or cold can be efficiently performed. It can store heat well and can improve utilization efficiency.

Based on the same idea, as shown in FIG. 6, when the entire surface is improved, the outermost peripheral portion (for example, one or several columns in thickness) of the improved body 2 that has been created. An embodiment in which a large number of heat exchanging pipes 1 are embedded in the improved body 2 on the inner side except the outermost part and the outermost peripheral portion is a heat insulating layer is also preferable (the invention of claim 1 ).

FIGS. 8A and 8B show an embodiment of the invention described in claim 5 . In particular, among the improved bodies formed in a continuous wall shape, the outermost peripheral wall-shaped portion 2a and the improved body 2b that forms the cells defined inside thereof are shown in FIG. 8B. In addition, a heat exchanging pipe embedded structure constructed as a heat insulating layer 3a is formed to a depth that reaches the hardly permeable layer 8 (for example, a clay layer) and lowers the groundwater level of the ground in the outermost mesh of the same An example is shown. In addition, the code | symbol 7 in FIG. 8 (B) points out the surrounding ground of water permeability (for example, a gravel layer, a sand layer, etc.).
Since the heat exchanging pipe embedment structure of the present embodiment also performs underground heat storage in the inner wall-shaped improvement body 2 surrounded by the heat insulating layer 3a, as in the second embodiment, the underground heat storage is performed in the groundwater flow. It can prevent going in and out by etc., can store heat or cold efficiently, and can improve utilization efficiency. When the hardly water-permeable layer 8 is near the ground surface, it is not necessary to consider the depth for forming the improved body 2, and it is only necessary to lower the groundwater level of the ground in the outermost mesh 3a. . Incidentally, the method for lowering the groundwater level can be carried out by a well-known deep well method (gravity drainage) or a well point method (forced drainage).

FIGS. 9A and 9B show an embodiment of the invention described in claim 6 . In particular, among the meshes defined by the continuous wall-like improvement body 2, for example, the wall-like improvement bodies 2c and 2d forming the grid 3b selected to be arranged continuously in a vertical row are not easily permeable. It is formed to a depth that reaches the layer 8, and the ground in the mesh 3b is formed in the heat insulating layer 3b by lowering the groundwater level. That is, an embodiment in which the heat insulating layer 3b (the improved body 2 and the heat exchanging pipe group 1 embedded therein) is divided into two left and right system blocks 9 and 10 in a large-scale heat exchanging pipe embedding structure is shown. . That is, according to the heat exchanging pipe embedment structure of the present embodiment, the divided two system blocks 9 and 10 are configured to be thermally shut off completely by the heat insulating layer 3b. For heat storage, the system block 10 can realize an efficient and easy-to-use underground heat storage system that is used for cold heat storage. Incidentally, when the ground surface vicinity is the hardly water-permeable layer 8 like the said Example 3, it is not necessary to consider the depth of the said improvement body 2 to produce.

  Further, FIG. 10 shows difficulty in the improvement bodies 2e and 2f forming the meshes 3c selected in a continuous arrangement in addition to the wall-like improvement bodies 2c and 2d that define the grids 3b selected in the vertical row. By constructing to a depth that reaches the water permeable layer 8 and lowering the groundwater level of the ground in the same mesh 3c to form a heat insulation layer, the heat exchanging pipe buried structure is vertically and horizontally arranged in four system blocks 11-14. The embodiment of the structure divided into these is shown. The four system blocks 11 to 14 can be used in various ways. Of course, it is possible to further divide into a plurality of blocks by selecting a plurality of rows of cells 3b that are continuous in the vertical row and a row of cells 3c that are continuous in the horizontal row and forming the above-described heat insulation layer.

  In addition, although the Example of this invention was described above, this invention is not limited to the Example mentioned above at all. The present invention can be implemented in various forms without departing from the gist of the present invention. For example, the heat exchange pipes 1 are embedded in a row arrangement only in the vertical or horizontal direction of the wall-shaped improvement body 2 or at intervals of every other row or every other row of the wall-like improvement body 2 You can also

(A) is a plan view showing an embodiment of a heat exchanging pipe embedding structure and an embedding method according to the inventions of claims 2 , 3 and 7 , and (B) is a heat exchanging pipe embedding structure of (A). It is the schematic diagram which divided into 4 area | regions. It is an elevation view which shows the step which embed | buried the pipe for heat exchange in the ground improvement body. (A) is an elevation view of the ground improvement machine, and (b) to (d) in (B) are process diagrams of the ground improvement work. (A)-(D) are explanatory drawings which show the different planar shape of a wall-shaped improvement body. It is a top view which shows the piping embedded structure for heat exchange of open shape like a cross-beam shape in planar view. It is a top view which shows the piping burying structure for heat exchange which concerns on the invention described in Claim 1 . It is a top view which shows the piping burying structure for heat exchange which concerns on the invention described in Claim 4 . It is a top view which shows the piping burying structure for heat exchange which concerns on the invention described in Claim 5 . It is a top view which shows the piping burying structure for heat exchange which concerns on the invention described in Claim 6 . It is a top view which shows the piping burial | buried structure for different heat exchange which concerns on the invention described in Claim 6 . It is the schematic which showed an example of the conventional underground heat storage system.

Explanation of symbols

1 Heat Exchange Piping 2 Wall-shaped Improvement 3 Hokume (Unmodified Ground Formation)
3a Thermal insulation layer 4 Target ground 9-14 System block

Claims (7)

In the structure where many heat exchanging pipes that recirculate the heat medium of the underground heat storage system are buried in the ground,
Is construction has ground improvement work to target ground underground heat storage, before the improved body was constructed to consolidate, into the inside of the improved body except for the outermost peripheral portion, and press the heat exchange pipe substantially U-shaped The heat exchanging pipe burying structure of the underground heat storage system is characterized in that a large number of heat exchanging pipes are buried in the ground by repeating the embedding process. In the structure where many heat exchanging pipes that recirculate the heat medium of the underground heat storage system are buried in the ground,
The wall shape where the ground improvement work is continued on the target ground for underground heat storage, and the outermost wall part is closed in plan view. The heat exchanging pipe of the underground heat storage system is characterized in that a large number of heat exchanging pipes are buried in the ground by repeating the process of pushing and embedding the replacement pipes into the wall-like improved body. Buried structure. In the structure where many heat exchanging pipes that recirculate the heat medium of the underground heat storage system are buried in the ground,
Ground improvement work is applied to the ground subject to underground heat storage in the shape of a wall that continues in a grid arrangement in plan view, and before the improved body is consolidated, the substantially U-shaped heat exchange pipe is A heat exchanging pipe burying structure for an underground heat storage system, wherein a number of heat exchanging pipes are buried in the ground by repeating the process of being pushed into the improved body and buried. 4. The heat exchanging pipe is embedded in the inner wall-like improvement body excluding the outermost wall-like portion among the created improvement bodies, according to claim 2 or 3 . Piping structure for heat exchange of underground heat storage system. Of the improvements made in a continuous wall shape, the outermost wall-like portion and the improvement forming the meshes defined inside are formed to a depth reaching the hardly permeable layer, The underground structure for heat exchange in an underground heat storage system according to claim 2 or 3 , wherein the ground in the center is formed in a heat insulating layer by lowering the groundwater level. Among the meshes defined by the improvement body formed in a continuous wall shape, the improvement body forming the meshes selected for a plurality of continuous arrangements is formed to a depth reaching the hardly permeable layer, The ground is formed in a heat insulating layer by lowering the groundwater level, and divided into a plurality of system blocks for each of the improved body divided by the heat insulating layer and the heat exchanging piping group embedded therein, and heat exchange is performed for each system block. characterized in that it selectively using use pipe group underground heat storage is configured to be, according to claim 2 or 3 heat exchanging pipe buried structure of the underground heat storage system described. In a method of burying a large number of heat exchange pipes that reciprocate the heat medium of the underground heat storage system into the ground,
The ground improvement work is continued on the ground subject to underground heat storage, and the outermost wall part is closed in a plan view. Before the improved body is solidified, the heat is approximately U-shaped. A method for burying heat exchange pipes in an underground heat storage system, characterized in that a large number of heat exchange pipes are buried in the ground by repeating the process of pushing and burying the replacement pipes into the wall-like improved body. .

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