JP4949359B2 - Underground temperature stratified thermal storage tank - Google Patents

Description

  The present invention relates to an underground stratified thermal storage tank with high thermal storage efficiency in a thermal storage system using a thermal storage medium such as water.

  Conventionally, a heat storage tank using water as a heat storage medium often uses an underground pit of a building in order to build it at a low cost. The underground pit generally has a water depth of 2 m or less and has a structure in which high-temperature water and low-temperature water can be easily mixed (connected fully mixed heat storage water tank), so heat storage performance must be lowered. When high heat storage performance is required, a temperature stratification type heat storage water tank is used. However, in order to reliably form a temperature stratification, a considerable water depth (generally 6m or more for a single type, 3m or more for a connected type) ) Is required and the depth of the underground pit tank is exceeded due to the structural requirements of the building, so the amount of underground excavation should be increased and an underground pit tank larger than the required depth should be constructed, or an independent high water depth heat storage such as a stainless steel panel tank Since it is necessary to install an aquarium, its construction is expensive. Moreover, when a certain amount of capacity is required as a heat storage water tank, since the water depth is shallow, a considerable area in plan is required. In addition, the depth of the underground pit tank as well as the panel tank installed on the ground is not affected by the outside air because it is easily affected by the outside air temperature, causing a large loss of thermal energy and increasing the running cost. Thus, heat insulation work is required, and the production cost of the heat storage tank increases.

As a technique for constructing a temperature stratified heat storage water tank at a low cost, there is one disclosed in JP-A-8-4350. This uses the hollow part of the foundation pile as a heat storage tank. Drill a hole in the ground in advance, insert a pre-made steel pipe pile with a bottom cover into the excavated pile hole, and fill the annular space between the hole wall of the pile hole and the outer periphery of the pre-made steel pipe pile with grout material. However, due to the looseness of the ground due to excavation of the pile hole, high bearing capacity is not obtained and the range of use as a foundation pile is limited. Is required, and the construction cost becomes high.
JP-A-8-4350

  An object of this invention is to solve the problem which the said conventional thermal storage water tank has.

The underground buried thermal stratification type thermal storage tank according to claim 1 is an underground buried thermal stratification type thermal storage tank constructed by adding a plurality of steel pipe piles or steel pipe tanks, and the bottom of the steel pipe piles or the steel pipe tanks. A protrusion is attached in advance to the inner surface of the lid mounting portion, and a pressure relief hole is opened in the side wall portion of the steel pipe pile or the steel pipe water tank below the bottom lid mounting portion, and is inscribed in the steel pipe pile or the steel pipe water tank. a disc-shaped drop lid, the steel pipe pile or steel pipe water tank buried-and installed after the formation of the bottom cover to secure the surroundings, the above steel pipe pile or steel pipe tank tip, the steel pipe pile or steel pipe than the inner diameter of the water tank are arranged among intubation smaller in diameter and the distal end is closed, after rotating pressed the steel pipe pile or steel pipe water tank to a predetermined position, the steel pipe pile after having extended inner intubation by joint Or a steel pipe tank By connecting the steel pipe added, characterized in that securing the depth of the heat storage tank.

The underground buried thermal stratification type thermal storage tank according to claim 2 has a protrusion attached in advance to the inner surface of the bottom lid attachment part of a large-diameter steel pipe water tank with excavating teeth attached to the tip, and is below the bottom lid attachment part. A pressure relief hole is opened in the side wall of the steel pipe water tank on the side, a disk-shaped drop lid inscribed in the steel pipe water tank is formed, and a bottom cover is formed by fixing the periphery to the tip or middle of the steel pipe water tank. the sealed provided bottom cover, store water and then, the steel pipe water tank embedded and installed by rotating pressed into the ground by adding a rotational force and a downward force while excluding sand entering the interior, the steel tube internal water injection pipes and water intake pipes installed in the manufacturing aquarium intubation inner diameter a and the tip is closed than the inner diameter of the steel pipe water tank is arranged inside said steel pipe water tank, the steel pipe water tank and the The gap with the intubation tube is filled with a heat insulating material containing air or gas. Cage, water injection piping-water intake pipes installed inside said intubation, a underground temperature stratified heat storage water tank constructed by replenishing the plurality of steel pipe water tank, the winged steel pipe aquarium tip , than the inner diameter of the vaned steel pipe water tank are arranged among intubation smaller in diameter and the distal end is closed, after rotating pressed the steel pipe water tank with the blade to a predetermined position, and extending the inner intubation by joint The above- mentioned bladed steel pipe water tank and the additional steel pipe are connected to ensure the water depth of the heat storage water tank.

Underground temperature stratified heat storage tank according to claim 3, wherein the corrosion protection in the invention of claim 1 or 2, at least one of the inner and outer surfaces of the steel pipe water tank, vinyl chloride, polyethylene, urethane, epoxy or the like It is characterized by being coated.

According to the configuration of the present application, the above problem can be solved as follows. The steel pipe water tank in which the excavation blades are welded to the bottom of the present invention can be buried in the ground by rotary press-fitting, so there is no need for underground excavation, construction time can be shortened, and construction cost is low. When the rotary press-fit steel pipe pile as the foundation pile supporting the building of the present invention is used as an underground buried thermal stratification type heat storage water tank, the construction cost is further reduced and a high bearing capacity is obtained as the foundation pile. Since there is no need to dig a hole in advance in the underground storage of a heat storage tank consisting of a steel pipe tank and a rotary press-fit steel pipe pile with a drilling blade attached to the bottom tip of the present invention, drilling earth and mud are generated. Without the processing cost, the construction cost becomes low. Moreover, if it is rotated reversely to the time of embedding, it can be easily removed, so that it can be recycled. Compared to the case where a rotary press-fit steel pipe pile is used as a heat storage tank, a steel pipe water tank having a drilling blade or a drilling tooth at the bottom end of the present invention does not require a structural support force, so the thickness of the steel pipe may be thin, It is also possible to use stainless steel having a low strength but high corrosion resistance. Furthermore, since a large-diameter steel pipe can be embedded, a large-capacity heat storage water tank can be manufactured at low cost. The steel pipe water tank having the excavating teeth at the bottom end of the present invention needs to eliminate the earth and sand entering the inside, but the rotational proof stress may be smaller than the case where the steel pipe with the excavating blade is press-fitted without draining. Therefore, the thickness of the steel pipe may be further reduced. Furthermore, it is possible to embed a steel pipe having a larger diameter. The temperature stratified heat storage tank of the present invention is deeply buried in the ground, is not affected by outside air deep in the ground, and its surroundings are covered with earth and sand, and since a heat insulation effect can be expected, there is little loss of thermal energy, The cost required for insulation is low. The heat storage water tank consisting of a steel pipe water tank and a rotary press-fit steel pipe pile with a drilling blade or drilling tooth attached to the bottom tip of the present invention can be deeply buried in the ground, and therefore stores a large amount of water with a small installation area in a plane. be able to. For example, when constructing a heat storage tank of 1000 m ³ , a connected temperature stratification type heat storage tank requires a plane installation area of about 330 m ² at a water depth of 3 m, but it is made of a steel pipe with blades welded to the bottom of the present invention. The heat storage tank has a diameter of 2 m and an effective water depth of 20 m and a capacity of 60 m ³ , so it is sufficient to construct about 16 temperature stratified heat storage tanks, and a temperature stratified heat storage tank with a pitch of 3 to 4 m. Even if it is buried in the ground, it suffices to occupy about half of the plane exclusive area. The underground stratified thermal storage tank in the present invention uses part or all of a rotary press-fit steel pipe pile as a foundation pile for supporting a building as a thermal storage tank, and is located outside the building or between the foundation piles of the building. The steel heat storage water tank is arranged and can be connected and used, so it is possible to store a large amount of water as a heat storage medium by effectively using the underground, and the upper space can also be used effectively for other purposes. can do.

The following effects can be obtained by the configuration of the present invention.
(1) An underground buried temperature stratified heat storage water tank with high heat storage performance can be constructed at low cost.
(2) If a rotary press-fit steel pipe pile as a foundation pile supporting a building is used as a thermal storage tank, an underground buried thermal stratified thermal storage tank can be constructed at a lower cost.
(3) An underground buried thermal stratification type thermal storage water tank with high heat storage performance can be constructed with a small area in a plane, and since the entire thermal storage tank is buried underground, the upper space can be used effectively.
(4) Since the rotational press-fit steel pipe pile has a high bearing capacity, it does not impair the original performance of the building as a foundation pile.
(5) The underground buried thermal stratified thermal storage water tank is buried in the ground by rotary press-fitting, so there is no need to excavate holes in advance, and no treatment of excavated sediment / drilling mud is required.
(6) Since it is buried deep underground, a heat insulation effect can be expected, the thermal energy loss of the heat storage tank can be reduced, and the cost for heat insulation can be reduced.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an example in which a rotary press-fit steel pipe pile 1 as a foundation pile supporting a building is used as a temperature stratified heat storage tank. The diameter of the rotary press-fit steel pipe pile 1 when supporting the vertical force is about 1.2 to 1.5 m, and the steel pipe pile when supporting the horizontal force may have a larger diameter. Excavation blades 3 are provided below the rotary press-fit steel pipe pile 1.

  FIG. 2 shows a rotary press-fit steel pipe pile 1. If this rotary press-fit steel pipe pile 1 is a single pipe, the water storage tank can be deficient in the water storage tank by adding by circumferential welding or the like at the site. The outer surface of the rotary press-fit steel pipe pile 1 may be coated with polyethylene, urethane or the like, and if inner surface corrosion is required, the inner surface may be coated with hard vinyl chloride or epoxy. Good.

  As shown in FIG. 2A, the lower end of the rotary press-fit steel pipe pile 1 is notched in a spiral shape, and the start end and the end end of the spiral notch are connected via a stepped portion. And the excavation blade | wing 3 is fixed concentrically with respect to the rotation press-fit steel pipe pile 1 along the lower end surface of the rotary press-fit steel pipe pile 1 cut out helically.

  As shown in FIG. 3, the excavation blade 3 is formed by partially cutting a disk-shaped (ring-shaped) steel plate in the radial direction, and an excavation blade 32 is fixed to the starting end cut surface 31 of the excavation blade 3 by welding. ing. The excavation blade 3 is formed so as to gradually spiral from the starting end cutting surface 31 while being separated from the lower end portion of the rotary press-fit steel pipe pile 1 and to circulate about one turn to the terminal cutting surface 33.

  The opening angle 34 between the start end cut surface 31 and the end cut surface 33 of the excavation blade 3 is about 45 degrees in the example of FIG. 3, but can be set in the range of 10 degrees to 90 degrees. In addition, when the rotary blade 2 is extended and the opening angle 34 is set to a position of 0 degree, the virtual end cut surface 33a and the start end cut surface 31 indicated by broken lines are parallel to each other.

  An open end hole 4 is opened at the center of the excavation blade 3. 2 and 3, the diameter D of the open end hole 4 is set to about 0.6 times the inner diameter of the rotary press-fit steel pipe pile 1, but the diameter of the open end hole 4 of the present invention is that of the rotary press-fit steel pipe pile 1. Any diameter may be used as long as it is equal to or smaller than the inner diameter, and the open end hole 4 may not be provided in the rotary press-fit steel pipe pile 1.

  The excavation blade 3 having the opening angle 34 and the open end hole 4 as described above ensures excellent penetration of the rotary press-fit steel pipe pile 1 and contributes to cost reduction by improving construction efficiency. Further, the excavation blade 3 having the above-described shape can adjust the invasion of soil into the pipe between about 1.5 times the pipe diameter and about half the pipe length, and the inside of the rotary press-fit steel pipe pile 1 Effective use of space becomes possible. 1 and 2, the excavation blade is shown as a spiral blade, but the shape of the excavation blade and its installation position are not limited as long as it is suitable for rotary press-fitting. Good.

In the process of rotationally press-fitting the rotary press-fit steel pipe pile 1, a part of the earth and sand excavated by the excavation blades 3 is discharged around the rotary press-fit steel pipe pile 1, and the rotary press-fit steel pipe pile 1 is rotated and consolidated on its outer periphery. Is done. Further, a part of the excavated earth and sand enters the pile from the inner opening 4 of the excavating blade 3. Although depending on the ground and soil conditions, the infiltration of earth and sand is in the range indicated by 5 in FIG. 1 (approximately 40 to 50% of the entire pile length). By closing the soil infiltration top with a lid and using the bottom lid 7 of the heat storage tank, the water depth of the heat storage tank is in the range indicated by 6 in FIG. 1 (generally 50-60% of the total pile length). When it is desired to secure a deeper water depth, it may be ensured by removing earth and sand that has entered the pile. On the upper part of the rotary press-fit steel pipe pile 1, a footing 2 as a lower structure of the building is constructed. A water injection pipe 9 and a water intake pipe 10 are installed inside the steel pipe pile heat storage water tank. In order to efficiently store and recover heat from water as a heat medium having formed a temperature stratification, one end of the pipe of the heat storage tank is disposed near the bottom of the heat storage tank and the other is disposed near the high water level of the heat storage tank.

  FIG. 4 shows an example in which a steel pipe water tank with excavation blades is rotationally press-fitted into the ground and embedded to construct a temperature stratified heat storage water tank. A blade 3 for excavation is attached to one end of a large-diameter steel pipe used as a steel pipe water tank 8. The shape and installation position of the excavation blade 3 may be anything including a spiral blade as shown in FIGS. 2 and 3 as long as it is suitable for rotary press-fitting. A rotational force and a downward biasing force are applied to the steel pipe water tank 8, and the ground is excavated with the excavation blade 3 at the tip while being rotatively pressed and buried in the ground. Build a stratified thermal storage tank. When the water depth of the heat storage tank is insufficient with a single pipe, it is handled by joining the steel pipe by in-situ circumferential welding in the same way as the construction of the steel pipe pile. As in the case of using a rotary press-fit steel pipe pile as a foundation pile supporting a building as a temperature stratified heat storage water tank, a water injection pipe 9 and a water intake pipe 10 are installed inside the heat storage water tank.

  Similarly, FIG. 6 shows an example in which a temperature stratified heat storage tank is constructed by rotating and embedding a steel pipe tank with excavated teeth into the ground. FIG. 11 shows an example of a construction method in which a steel pipe water tank with excavating teeth is rotationally press-fitted into the ground. A large-diameter steel pipe 8 having excavating teeth 23 at the bottom end is inserted into a hammer grab. While being excluded at 25, the casing jack 24 is rotated and oscillated and press-fitted into the ground. The rotation of the steel pipe may be a full turn continuous rotation instead of rotational swinging.

  FIGS. 13-16 shows the Example of the construction method of the bottom cover of a steel pipe pile and a steel pipe water tank. FIG. 13 shows that a steel ring 26 as a projection is welded in advance to the inner surface of the bottom lid mounting portion of the steel pipe pile and the steel pipe water tank, and the steel pipe pile and the steel pipe water tank are internally embedded after installation and installation of the steel pipe pile and the steel pipe water tank. In this example, the disk-shaped drop lid 7 in contact is engaged with the steel wheel 26 and the periphery is welded 27 to form the bottom lid.

  FIG. 14 is an example of an embodiment in which the bottom lid 7 is formed after the rotary press-fitting when the soil does not penetrate so much into the steel pipe pile and the steel pipe water tank. In the example of FIG. 14, the steel wheel 26 is welded in advance to the upper part of the soil intrusion position (bottom lid formation position) on the inner periphery of the steel pipe pile and the steel pipe water tank. Next, after the rotary press-fitting of the steel pipe pile and the steel pipe water tank, after dropping the drop lid 7 inscribed in the steel pipe, cinder concrete 35 having a waterproof joint at the joint with the steel pipe is placed. Then, after sealing the joint portion 36, a waterproof coating 37 is applied to form the bottom lid 7.

  The example of FIG. 15 shows an example in which the bottom cover 7 is attached in advance at predetermined positions on the inner surfaces of the steel pipe pile and the steel pipe water tank. In this embodiment, when the penetration resistance is large due to hard ground or the like, an air vent hole 29 is formed to remove the air compressed in the space below the bottom cover 7 by the soil 38 entering from the tip, thereby reducing the penetration resistance. It is preferable to do so.

  FIGS. 15A and 15B show an example in which an air vent hole 29 is provided in the bottom lid 7 and the formation of the bottom lid 7 is completed by closing the air vent hole 29 with a plate 30 after the rotary press-fitting of the steel pipe pile and the steel pipe water tank. It is. FIG. 15C shows an example in which the air vent hole 29 is opened in the steel pipe pile just below the bottom cover 7 and the side wall of the steel pipe water tank. In this case, it is not necessary to block the air vent hole 29 after the rotational press-fitting.

  FIG. 16 is an example of an embodiment in which the bottom lid 7 is formed after the rotary press-fitting when the soil enters the steel pipe pile and the steel pipe water tank to some extent. In the example of FIG. 16, a ring-shaped reinforcing bar 26a for concrete fixing is previously welded to the upper part of the soil intrusion position (bottom lid forming position) on the inner periphery of the steel pipe. Next, concrete 28 is poured into the steel pipe pile and the steel pipe water tank after the rotary press-fitting, and cinder concrete 35 having a waterproof joint at the joint with the steel pipe is placed. Thereafter, the bottom cover 7 is formed in the same process as the above example of FIG. Even when the groundwater level is shallower than the bottom lid formation position, the bottom lid 7 can be formed by placing underwater concrete.

  Moreover, FIG. 17 is the example which has arrange | positioned the intubation 39 inside the steel pipe pile and the steel pipe water tank. The outer diameter of the inner intubation 39 is set smaller than the inner diameter of the steel pipe, and the distal end of the inner intubation 39 is closed by a cap or the like. The gap between the steel pipe and the inner tube 39 is filled with a heat insulating material 40 containing air or gas. Two pipes 41 and 42 are disposed inside the inner intubation 39, and water or other heat medium is circulated inside the inner intubation 39. FIG. 17 shows an example of a cold water heat storage operation or a hot water heat storage recovery (radiation) operation, in which the pipe 41 is a water injection pipe and the pipe 42 is a water pipe. When the heat storage operation is switched, the pipe 42 becomes a water injection pipe and the pipe 41 is switched to a water intake pipe [not shown].

  Moreover, FIG. 18 is an example which extends the temperature stratification type | mold thermal storage water tank by adding the steel pipe of the steel pipe pile and the steel pipe water tank, and the internal insertion pipe 39, when the water depth of a heat storage tank is insufficient with a single pipe.

  In the heat storage water tank installation operation of FIG. 18, first, a small-diameter inner tube 39 whose tip is closed is inserted inside the bladed steel pipe 43 at the tip. A gap between the bladed steel tube 43 and the inner tube 39 is filled with a heat insulating material 40 containing gas, and the inner tube 39 is fixed in the bladed steel tube 43 by using a jig or the like as necessary.

  Next, the bladed steel pipe 43 is rotationally press-fitted to a predetermined position, the additional steel pipe 44 is suspended, and the bladed steel pipe 43 and the additional steel pipe 44 are joined. An inner intubation 39 is also fixed inside the additional steel pipe 44, and a heat insulating material 40 containing gas is also filled in the gap between the additional steel pipe 44 and the inner intubation 39. Here, the joints 39 are joined by a joint 45 having excellent water tightness, flexibility and stretchability, and the joint between the bladed steel pipe 43 and the additional steel pipe 44 is performed by on-site circumferential welding or the like. .

  After the joining of the bladed steel pipe 43 and the extension steel pipe 44 is completed, the integrated bladed steel pipe 43 and the extension steel pipe 44 are rotationally press-fitted. The heat storage tank can be extended to a desired length by repeating the above-described addition work as necessary. Then, after completion of the rotary press-fitting, the two pipes 41 and 42 are arranged inside the inner intubation 39 to complete the heat storage water tank. Here, FIG. 18B is an example of the cold water heat storage operation or the hot water heat storage recovery (radiation) operation, in which the pipe 41 is a water injection pipe and the pipe 42 is a water supply pipe. When switching during operation or during hot water heat storage operation, the pipe 42 becomes a water injection pipe, and the pipe 41 is switched to a water intake pipe [not shown].

  Note that the above installation work is merely an example, and is not limited to the illustrated example. For example, the extension steel pipe 44 and the inner insertion pipe 39 may be suspended at the same time and joined to each other without fixing the inner insertion pipe 39 to the extension steel pipe 44 in advance. Further, the inner tube 39 is fixed only with a jig, and after the embedment of the bladed steel tube 43 and the additional steel tube 44 is completed, the gap between the steel tubes 43, 44 and the inner tube 39 is closed, and a heat insulating layer is formed by air. It may be formed [both are not shown].

1, 4, and 6 show an operation state at the time of storing cold water and recovering heat of hot water in an underground buried thermal stratification type thermal storage tank constructed by rotary press-fit steel pipe piles and rotary press-fit steel pipe water tanks. Yes. Furthermore, FIG. 5 shows the driving | running state at the time of the heat | fever recovery of cold water and the thermal storage of the warm water in the underground buried temperature stratification type thermal storage water tank constructed with the rotary press-fit steel pipe water tank with the excavation blade. In this case, the water injection pipe 9 and the water intake pipe are opposite to the operation states of FIGS. 1 and 4. The same applies to the underground buried thermal stratification type thermal storage tank constructed by a rotary press-fit steel pipe pile and a rotary press-fit steel pipe water tank with excavating teeth.

  7-10 is the schematic of an example which simplified the air-conditioning system in the case of connecting and using two or more underground temperature stratification type thermal storage water tanks by this invention in parallel. The cold water or hot water produced by the heat source device 11 is circulated between the underground storage temperature stratified heat storage water tank by operating the heat storage pump 13 during heat storage. During the air conditioning, the cold / hot water pump 14 is operated and circulated to the load side. At the time of heat storage recovery, the heat storage recovery primary pump 15 and the heat storage recovery secondary pump 16 are operated to circulate cold water or hot water in the underground buried temperature stratified water tank to the heat exchanger 12, and at the same time, the cold water or hot water on the load side is also heated. Heat is recovered by circulating heat through the exchanger 12.

  In the heat storage circulation system of the heat source apparatus 11 to the underground buried temperature stratified heat storage water tank 8, in order to efficiently use the temperature stratified heat storage water tank, switching valves 17a and 17b for cold water operation and hot water operation are provided. Similarly, the cold water operation / warm water operation switching valves 18a and 18b are also provided in the heat storage and recovery circulation system of the underground stratified thermal storage water tank 8 to the heat exchanger 12. During air conditioning, the heat source system and the heat storage / recovery circulation system are used together to perform air conditioning. Therefore, each cold water or hot water joins at the water supply header 19 and is supplied to the load-side air conditioner 20 to be used for heat and then returned. Branches at the water header 21 and returns to each system.

  During the cold water heat storage operation, the switching valve 17b is opened as shown in FIG. 7, and the heat transfer water in the upper part of the heat storage water tank is taken in by the water pipe 10 and sent to the heat source unit 11 as shown in FIGS. The cold water cooled by the heat source unit 11 is poured into the lower part of the heat storage water tank through the water injection pipe 9. The water as the heat medium in the heat storage water tank forms a temperature stratification by the tank shape, is gradually cooled from the bottom, and the heat storage is completed when the water in the upper part of the heat storage water tank is cooled to a predetermined temperature.

  At the time of the cold water heat storage recovery (radiation) operation, the switching valve 18b is opened as shown in FIG. 8, the cold water in the lower part of the heat storage water tank 8 is taken in by the water pipe 10 as shown in FIG. , The load-side air conditioning is performed, and the cold water heated by the heat exchanger 12 is returned to the upper part of the heat storage water tank 8 through the water injection pipe 9. Water as a heat medium in the heat storage water tank forms a temperature stratification according to the tank shape, and cold water having a constant temperature can always be supplied from the bottom thereof, and heat storage and recovery can be efficiently performed. In the heat storage water tank 8, the temperature gradually rises from the top due to the return cold water, the temperature rises to the cold water at the bottom of the heat storage water tank 8, and the heat storage recovery is completed when the predetermined temperature of cold water cannot be taken out.

  At the time of the hot water heat storage operation, the switching valve 17a is opened as shown in FIG. 9, and water as a heat medium is taken from the lower part of the heat storage water tank 8 through the water pipe 10 as shown in FIG. The hot water heated and heated by the heat source device 11 is poured into the upper part of the heat storage water tank 8 through the water injection pipe 9. The water as the heat medium in the heat storage water tank 8 forms a temperature stratification according to the tank shape, is gradually heated from the top of the heat storage water tank 8, and the heat is stored when the temperature is raised to a predetermined temperature to the bottom of the heat storage water tank 8. Complete.

During the heat storage and recovery (heat radiation) operation of the hot water, the switching valve 18a is opened as shown in FIG. 10, the water in the upper part of the heat storage water tank 8 is taken in the water pipe 10 as shown in FIGS. It is sent to the exchanger 12 to perform air conditioning on the load side, and the hot water deprived of heat by the heat exchanger 12 is returned to the lower part of the heat storage tank 8 by the water injection pipe 9. Water as a heat medium in the heat storage water tank forms a temperature stratification according to the tank shape, and it is possible to always supply hot water at a constant temperature from the upper part, and heat storage and recovery can be efficiently performed. In the heat storage water tank 8, the temperature gradually decreases from the bottom due to the return hot water, the temperature decreases to the hot water at the top of the heat storage water tank 8, and the heat storage recovery is completed when hot water at a predetermined temperature cannot be taken out.

  FIG. 11 shows an example of an underground buried thermal stratification type thermal storage tank in which a plurality of steel pipe thermal storage tanks installed between piles in a building and a rotary press-fit steel pipe pile as a foundation pile supporting the building are connected and used as a thermal storage tank. Is shown. FIG. 11A is a plan view, and FIG. 11B is a cross-sectional view. In a space surrounded by four footings 2, a steel pipe heat storage water tank 8 buried in the ground by a rotary press-fitting method is installed. A total of four of the rotary press-fit steel pipe piles connected to the four footings 2 are used as the heat storage tank 1. What is used as a heat storage water tank has its upper end protruding above the floor level of the footing 2, the water injection pipe 9 and the water intake pipe 10 are installed, and the rotary press-fit steel pipe pile 22 that is not used as a heat storage water tank is footed at its head. 2 is embedded.

It is a figure which shows an example which used the rotary press-fit steel pipe pile as an underground buried temperature stratification type thermal storage water tank. It is the front view of a rotary press-fit steel pipe pile, and its sectional drawing. It is the top view and perspective view of an excavation blade provided in the rotation press fit steel pipe pile tip. It is a figure which shows an example which used the steel pipe water tank with an excavation blade | blade as an underground buried temperature stratification type thermal storage water tank. It is a figure which shows the driving | running state at the time of the thermal storage collection | recovery of the cold water of a underground embedment temperature stratification type thermal storage tank, and the thermal storage of hot water. It is a figure which shows an example which used the excavation toothed steel pipe water tank as an underground buried temperature stratification type heat storage water tank. It is a figure which shows the driving | running state at the time of thermal storage of cold water. It is a figure which shows the driving | running state at the time of the heat storage collection | recovery of cold water. It is a figure which shows the driving | running state at the time of thermal storage of warm water. It is a figure which shows the driving | running state at the time of the heat storage collection | recovery of warm water. It is the figure which has arrange | positioned the rotary press-fit steel pipe pile and the rotary press-fit steel pipe water tank between the footings of a building. It is a figure which shows an example of the construction method which press-fits the excavation toothed steel pipe water tank. It is a figure which shows an example of the attachment state of the bottom cover of this invention. It is a figure which shows an example of the attachment state of the bottom cover of this invention. It is a figure which shows an example of the attachment state of the bottom cover of this invention. It is a figure which shows an example of the attachment state of the bottom cover of this invention. It is a figure which shows the example which has arrange | positioned the internal intubation inside steel pipe piles. It is a figure which shows the example which extends the temperature stratification type | mold thermal storage water tank by adding steel pipes, such as a steel pipe pile, and an internal intubation.

Explanation of symbols

1 Rotating press-fit steel pipe pile 2 Footing 3 Excavation blade 4 Rotating press-fit steel pipe pile lower end central space (open end hole)
5 Soil infiltration range of rotary press-fit steel pipe piles 6 Storage range of rotary press-fit steel pipe piles 7 Bottom cover 8 Rotary press-fit steel pipe water tank 9 Injection pipe 10 Intake pipe 11 Heat source machine 12 Heat exchanger 13 Heat storage pump 14 Cold / hot water pump 15 Heat storage recovery 1 Secondary pump 16 Heat storage recovery secondary pump 17a Switching valve 17b Switching valve 18a Switching valve 18b Switching valve 19 Water feed header 20 Air conditioner 21 Return water header 22 Rotary press-fit steel pipe pile 23 not used as a heat storage tank 23 Excavation teeth 24 Casing jack 25 Hammer grab 26 Steel wheel 26a Ring-shaped rebar 27 Welding 28 Concrete 29 Air vent hole 30 Plate 31 Start end cut surface 32 Excavation blade 33 End cut surface 33a Virtual end cut surface 34 Opening angle 35 Cinder concrete 36 Seal 37 Waterproof coating 38 Soil 39 Intubation tube 40 Thermal insulation 41 Piping 42 Piping 43 With blades Steel pipe 44 Additional steel pipe 45 Joint

Claims (3)

Underground temperature stratified thermal storage tank constructed by adding a plurality of steel pipe piles or steel pipe tanks,
Protrusion is attached in advance to the inner surface of the bottom lid mounting portion of the steel pipe pile or the steel pipe water tank, and a pressure relief hole is opened in the side wall portion of the steel pipe pile or the steel pipe water tank below the bottom lid mounting portion. A disk-shaped drop lid inscribed in a steel pipe pile or a steel pipe water tank, and after fixing the periphery to form a bottom cover, the steel pipe pile or the steel pipe water tank is buried and installed,
The above steel pipe pile or steel pipe tank tip, are arranged within intubation smaller in diameter and the distal end is closed than the inner diameter of the steel pipe pile or steel pipe water tank,
After rotating pressed the steel pipe pile or steel pipe water tank to a predetermined position, characterized in that on the extended inner intubation by joints to ensure a depth of the heat storage water tank by connecting the steel pipe pile or steel pipe water tank and replenishing steel Underground temperature stratified thermal storage tank. A protrusion is attached in advance to the inner surface of the bottom lid mounting part of a large-diameter steel pipe water tank with excavating teeth attached to the tip, and a pressure relief hole is opened in the side wall part of the steel pipe water tank below the bottom cover mounting part. A disk-shaped drop lid inscribed in the steel pipe water tank, and the bottom is formed by fixing the periphery, and a bottom cover is provided at the tip or middle of the steel pipe water tank so that the water can be stored . While removing the earth and sand that penetrates the water tank , it adds rotational force and downward force and rotates and presses it into the ground, embeds and installs it, and installs water injection and intake pipes inside the steel pipe water tank .
Among intubation smaller in diameter and the distal end than the inner diameter of the steel pipe water tank is closed is arranged inside said steel pipe water tank insulation in the gap between the steel pipe water tank and the intubation containing air or gas The water injection pipe and water intake pipe are installed inside the above intubation,
A underground temperature stratified heat storage water tank constructed by replenishing the plurality of steel pipe water tank, the winged steel pipe tank tip, is smaller in diameter and the distal end than the inner diameter of the steel pipe water tank with the wings closed It is arranged intubation inner being, after rotating pressed the steel pipe water tank with the blade to a predetermined position, the heat storage after having extended inner intubation by joint and connecting the steel pipe water tank winged and shirttail steel Underground temperature stratified thermal storage tank characterized by securing the water depth of the tank. The underground buried thermal stratification type heat storage water tank according to claim 1 or 2 , wherein at least one of an inner surface and an outer surface of the steel pipe water tank is anticorrosive coated with vinyl chloride, polyethylene, urethane, epoxy, or the like.

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