KR101323272B1 - Cover for protecting end of geothermal heat exchange pipe - Google Patents

Cover for protecting end of geothermal heat exchange pipe Download PDF

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Publication number
KR101323272B1
KR101323272B1 KR1020110090286A KR20110090286A KR101323272B1 KR 101323272 B1 KR101323272 B1 KR 101323272B1 KR 1020110090286 A KR1020110090286 A KR 1020110090286A KR 20110090286 A KR20110090286 A KR 20110090286A KR 101323272 B1 KR101323272 B1 KR 101323272B1
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South Korea
Prior art keywords
heat exchanger
pair
underground heat
opening
cover
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KR1020110090286A
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Korean (ko)
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KR20130026858A (en
Inventor
김봉찬
이석진
강호덕
이주호
김평화
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마천건설 주식회사
롯데건설 주식회사
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Priority to KR1020110090286A priority Critical patent/KR101323272B1/en
Publication of KR20130026858A publication Critical patent/KR20130026858A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Mechanical Engineering (AREA)

Abstract

The present invention relates to a cover which is temporarily installed at the end of the underground heat exchanger to protect the end of the underground heat exchanger from being damaged during the crushing removal work of the upper concrete mixed with impurities, for protecting the end of the underground heat exchanger according to the present invention. The cover may include a spacer provided between the pair of heat exchanger tubes at the end of the underground heat exchanger to maintain the pair of heat exchanger tubes spaced apart from each other; It is made of a material having elasticity and provided in the shape of a sleeve formed with an opening in the longitudinal direction, it is delivered to the pair of heat exchanger tube wrapped around the pair of heat exchanger tube and the spacer inserted to extend the opening Shock absorbers; And a fixing part for fixing the buffer body so as not to be separated while surrounding the pair of heat exchange tubes and the spacer.
According to the present invention, there is provided a spacer for keeping the pair of heat exchanger tubes at the end of the underground heat exchanger spaced apart at regular intervals and a buffer surrounding the end of the underground heat exchanger to effectively remove the end of the underground heat exchanger during the shredding removal of the upper concrete. In addition to being able to protect, the shock absorber is provided with an expandable opening and a fixing part for easily fixing or unfastening the shock absorber to the end of the underground heat exchanger, which is a support pillar for supporting the shock absorber without bending. By including a cover body comprising a so that the installation can be stably adjusted by holding the cover body in the state installed at the end of the underground heat exchanger, the installation and disassembly can be made very easy and quick.

Description

End cover of underground heat exchanger {COVER FOR PROTECTING END OF GEOTHERMAL HEAT EXCHANGE PIPE}

The present invention relates to an end protection cover of an underground heat exchanger, and more particularly, it is possible to effectively protect the end of the underground heat exchanger during the shredding removal work of the upper concrete, the underground which can be installed and dismantled very simply and quickly A protective cover for an end portion of a heat exchanger.

Recent economic growth in China and India has led to a surge in demand for petroleum and an unstable political situation in oil-producing countries, leading to more interest in new energy sources to replace fossil fuels than ever before.

As a new alternative energy source, researches on solar heat, wind power, and geothermal heat are being conducted. These energy sources have the advantage of obtaining energy with little influence on air pollution and climate change, but have a very low energy density. There is also.

In particular, in order to obtain sufficient energy by using wind and solar heat, it is necessary to secure a large installation area, and due to environmental variability such as uneven wind speed or sunshine, energy production is not constant and costs are considerable for maintenance. There is a limit.

Therefore, there is a high interest in geothermal energy, which can always obtain a constant energy, and relatively low cost for maintenance.

In general, a geothermal air-conditioning apparatus using geothermal energy is an underground heat exchanger for cooling refrigerant and connected to the ground heat exchanger, and a heat pump and a heat pump connected to the underground heat exchanger to circulate the refrigerant and transfer the recovered ground heat to a required place. It is composed of a control unit for controlling the.

As such, in order to use geothermal energy, the installation hole must be drilled into the ground and an underground heat exchanger must be inserted into the ground. Therefore, the initial construction time and cost are high.

In order to solve this drawback, in recent years, a method of constructing an underground heat exchanger with other civil structures has been studied. An example of this is a method of constructing an underground heat exchanger when constructing a slurry wall continuously in the ground using a high density stabilizer.

The sequence of construction of the slurry wall and the heat exchanger is as follows.

First, the excavation part is excavated to form an excavation portion, and the excavation portion is filled with a stabilizer so as not to collapse. After installing the underground heat exchanger and the reinforcing bar at the excavation section, the slurry wall is formed by filling and curing concrete at the excavation section while recovering the stabilizer.

At this time, the upper end concrete of the slurry wall is formed, since the strength is lowered while mixing the impurities such as the stabilizer and the suspended solids, the upper concrete is crushed and removed, and then the concrete is poured again.

However, when the upper concrete is crushed and removed as described above, there is a problem that the end of the underground heat exchanger protruding from the upper concrete is damaged by being impacted by the crusher. If the end of the underground heat exchanger is broken, it must be repaired or rebuilt, which is very serious because it takes a lot of time and money.

In order to solve this problem, the end of the ground heat exchanger was cut to a suitable size by wrapping the end of the underground heat exchanger and temporarily fixing it with a tape or a band to prevent the end of the ground heat exchanger. It takes a lot of time to install and dismantle, not only the fixing of the cushioning material is not robust, but also has the disadvantage of very cumbersome work.

In this way, the direct contact between the end of the underground heat exchanger and the crusher can be blocked, but due to the vibration or shock transmitted from the crusher, the pair of heat exchanger tubes at the end of the underground heat exchanger come into contact with and impact each other. There is a limit that damage cannot be completely prevented.

In order to solve the problems as described above, the present invention can mitigate the shock transmitted to the heat exchanger tube while keeping the pair of heat exchanger tubes at the end of the underground heat exchanger end from being damaged by impacting each other, the underground heat exchanger It is an object of the present invention to provide an end protection cover of an underground heat exchanger that can be fixed to an end and can be easily adjusted in its installation position.

In order to solve the problems as described above, the end protection cover of the underground heat exchanger according to the present invention is temporarily installed at the end of the underground heat exchanger, the end of the underground heat exchanger during the shredding removal operation of the upper concrete mixed with impurities A cover that protects from damage, the cover is provided between the pair of heat exchanger tube of the underground heat exchanger end to maintain the pair of heat exchanger tube spaced apart from each other; It is made of a material having elasticity and provided in the shape of a sleeve formed with an opening in the longitudinal direction, it is delivered to the pair of heat exchanger tube wrapped around the pair of heat exchanger tube and the spacer inserted to extend the opening Shock absorbers; And a fixing part for fixing the buffer body so as not to be separated while surrounding the pair of heat exchange tubes and the spacer.

The spacer may include a pair of grooves into which the pair of heat exchange tubes are inserted, respectively, and may be made of an elastic material to mitigate an impact.

The fixing part may include a cover body provided in a sleeve shape having an opening formed along a longitudinal direction corresponding to the shock absorber and fixed to an outer circumferential surface of the shock absorber, and the opening may expand as the opening is expanded; And fastening members installed on both sides of the opening of the cover body to fix the opening so as not to expand so that the cover body can be fixed in a state of pressing the outer circumferential surface of the buffer body.

The fastening member may include: a first fastening member rotatably installed at one side of the opening of the cover body and having a predetermined locking hole; And a second fastening member provided at the other side of the opening of the cover body and having a locking protrusion inserted into and fixed to the locking hole.

The cover body, the support pillar is fixed in the longitudinal direction to the buffer to support the buffer not to bend along the longitudinal direction; And a pair of casings formed of an elastic material so as to be provided at both ends of the support pillar in the width direction, respectively, to form the opening between the ends thereof, and to be bent with respect to the support pillar.

According to the cover for protecting the end of the underground heat exchanger of the present invention, a pair of heat exchanger tube of the underground heat exchanger end is delivered to the heat exchanger tube wrapped around the spacer and the end of the underground heat exchanger to be spaced apart at regular intervals so as not to damage each other. A shock absorber is provided to absorb and mitigate the impact that can be effectively protected at the end of the underground heat exchanger during the shredding removal of the upper concrete.

In addition, the buffer body is formed with an expandable opening for easily inserting a pair of heat exchange tubes, and has an opening corresponding to the opening for simply fixing or releasing the buffer to the end of the underground heat exchanger. By providing a fixing portion formed in a shape surrounding the buffer body, the fixing portion can be installed and dismantled very easily and quickly at the end of the underground heat exchanger.

In addition, since the fixing part includes a cover body including a support column for supporting the buffer body not to bend, the mounting position can be stably adjusted by holding and transporting the cover body in a state of being installed at the end of the underground heat exchanger. Its installation is easier.

1 is a view showing a state in which the end protective cover of the underground heat exchanger according to the preferred embodiment of the present invention is installed at the end of the underground heat exchanger constructed together in the slurry wall,
2 is a perspective view illustrating a state in which an end protective cover of an underground heat exchanger according to a preferred embodiment of the present invention is installed at an end of the underground heat exchanger;
3 is a cross-sectional view of AA shown in FIG.
Figure 4 is an exploded perspective view of the end protective cover of the underground heat exchanger according to a preferred embodiment of the present invention,
FIG. 5 is a flowchart illustrating a method of constructing an underground heat exchanger together when constructing a slurry wall using an end protective cover of the underground heat exchanger according to the preferred embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains (hereinafter, referred to as a person skilled in the art) may easily perform the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

The end protection cover of the underground heat exchanger according to the present invention, when the underground heat exchanger is constructed with a structure such as a slurry wall, is temporarily installed at the end of the underground heat exchanger, the underground heat exchanger during the shredding removal work of the upper concrete mixed with impurities It is a cover which protects the end part from being damaged.

Hereinafter, with reference to the accompanying Figures 1 to 4, the configuration and effect of the end protection cover of the underground heat exchanger according to a preferred embodiment of the present invention will be described in detail.

End protection cover of the underground heat exchanger according to a preferred embodiment of the present invention comprises a spacer 100, the buffer 200 and the fixing part 300.

The spacer 100 is provided between the pair of heat exchange tubes 11 at the ends of the underground heat exchanger 10 to serve to keep the pair of heat exchange tubes 11 spaced apart from each other.

The spacer 100 is made of an elastic material such as a foamed resin so as to alleviate the shock transmitted between the pair of heat exchange tubes 11, in order to stably space the pair of heat exchange tubes (11). As shown in FIG. 2, it is preferable that a pair of grooves 110 into which a pair of heat exchange tubes 11 are inserted are formed.

In addition, the spacer 100 has a cross-sectional shape of a starfish or a star shape, and the thickness of the side wall constituting the groove part 110 is somewhat thin, so that the side wall is elastically deformed with respect to an impact transmitted from the outside. ) Can be properly transported and returned to more effectively mitigate the impact delivered to the heat exchange tube (11).

The buffer 200 effectively absorbs the shock transmitted to the heat exchange tube 11 by surrounding the outer circumferential portions of the pair of heat exchange tube 11 and the spacer 100.

To this end, the buffer 200 is made of an elastic material such as foamed resin, as shown in Figure 4, so that a pair of heat exchange tubes 11 interposed between the spacer 100 is inserted It is provided in the shape of a sleeve formed with an opening 210 along the longitudinal direction.

Therefore, the opening 210 is inserted when the pair of heat exchange tubes 11 having the spacer 100 interposed therein are inserted into the buffer 200, or when the buffer 200 is separated from the pair of heat exchange tubes 11. It will expand and be inserted or removed.

In a preferred embodiment of the present invention, the shock absorber 200 is implemented in a sleeve shape having a ring cross section, but the shape is sufficient to cover the outer circumference of the pair of heat exchange tubes 11 may be somewhat deformed It may be.

In addition, the buffer body 200 may be formed on the inner circumferential surface or the outer circumferential surface and the like concave-convex pattern that can improve the buffering effect.

The fixing part 300 is fixed so that the buffer 200 as described above does not escape in a state wrapped around the pair of heat exchange tubes 11 interposed with the spacer 100, or the buffer 200 is a pair It serves to release the fixing to be separated from the heat exchange tube (11).

To this end, the fixing part 300 is fixed to the outer circumferential surface of the buffer body 200 to cover the cover body 310 and the cover body 310 and the buffer body 200 to serve to hold the buffer 200. It includes a fastening member 320 for fixing the opening 312-1 formed in the cover body 310 so that the inserted heat exchanger tube 11 is not separated.

As shown in FIGS. 2 to 4, the cover body 310 is provided in a sleeve shape in which an opening portion 312-1 is formed along a length direction to correspond to the shape of the buffer body 200. The inner circumferential surface is attached and fixed to the outer circumferential surface of the buffer body 200 so that the 312-1 corresponds to the opening 210 of the buffer body 200, such that the opening 210 and the opening part 312-1 are together. It is provided to be extended.

The cover body 310 is fixed along the longitudinal direction of the buffer body 200 and is made of a hard material or a thick thickness not easily bent to support the support pillar 311 so that the buffer body 200 is not bent along the longitudinal direction. And a pair of casings each made of an elastic material so as to be provided at both ends in the width direction of the support pillar 311 so as to form an open portion 312-1 between the ends thereof and bend relative to the support pillar 311. 312.

The end protective cover of the underground heat exchanger according to the present invention may need to be adjusted up and down after being installed at the end of the underground heat exchanger, and the support column 311 is cushioned at the time of correcting the position of the cover. As the sieve 200 is bent along the longitudinal direction, it is prevented from being moved without being moved.

In particular, the operator who performs the position correcting operation of the cover can easily adjust the installation position of the cover by holding the support pillar 311 of the cover body 310 and applying a force up and down.

In a preferred embodiment of the present invention, the support pillar 311 and the casing 312 is made of the same material, the support pillar 311 is formed to be thick not easily bent, but the implementation manner is not limited thereto. For example, the support pillar 311 may be made of a separate material that is harder than the casing 312, and may be implemented in a form in which the casing 312 is provided in the support pillar 311.

In addition, the end protection cover of the underground heat exchanger according to the preferred embodiment of the present invention has been implemented such that the opening 312-1 is expanded through the elastic deformation of the casing 312, but the implementation manner is not limited thereto. For example, the casing 312 may be provided in the support pillar 311 through a pivoting member such as a hinge, such that the opening 312-1 may be extended by a pivoting operation on the support pillar 311.

Such a cover body 310 also serves to improve the durability of the end protection cover of the underground heat exchanger, and thus used once if necessary, but the cover is not severely damaged from the end of the underground heat exchanger (10) It can also be reused.

The above-described fastening member 320 is provided in a plate shape and implements a function of fixing or releasing the opening 312-1 so as not to be selectively expanded, and one side casing of the opening 312-1 based on the opening 312-1. The first fastening member 321 rotatably installed in the 312 and having a predetermined locking hole 321-1, and the other side of the casing 312 based on the opening 312-1, are provided in the locking hole. And a second fastening body 322 having a locking protrusion 322-1 inserted into or fixed to the 321-1.

That is, when installing the end protection cover of the underground heat exchanger according to the preferred embodiment of the present invention at the end of the underground heat exchanger 10, the opening portion 312-1 and the opening 210 are pressurized to expand the spacer 100. And a pair of heat exchange tubes 11 interposed therebetween are inserted into the shock absorber 200, and then the first fastening body 321 is rotated to engage the second fastening body 322. By inserting and fastening to the locking hole 321-1, the cover can be fixed easily and quickly.

In addition, when dismantling the end protective cover of the underground heat exchanger at the end of the underground heat exchanger 10, the first fastening member 321 is rotated to separate the locking projection 322-1 from the locking hole 321-1. By doing so, the cover can be released easily and quickly.

Here, the first fastening member 321 is made of a tough resin material, but is implemented to be rotatable with respect to the casing 312 without a rotating member such as a separate hinge, but the implementation manner is not limited thereto, and a separate rotating member It may be installed in the casing 312 through.

And in a preferred embodiment of the present invention, the casing 312 is provided with a pair to form a sleeve shape to surround the entire outer peripheral surface of the buffer 200, the number and shape of the provided is not limited thereto. For example, the casing 312 may be provided to surround only a portion of the outer circumferential surface of the shock absorber 200, and may be provided with two or three pairs or more.

On the other hand, although not provided in the preferred embodiment of the present invention, the upper end and the lower end of the fixing part 300 is made of a high-strength material such as metal to improve the durability of the cover brackets surrounding the outer peripheral surface of the upper and lower ends of the fixing part 300 A protection member such as may be further provided.

Hereinafter, referring to FIGS. 1 and 5, a process of safely constructing the underground heat exchanger 10 together with the slurry wall 20 using the end protection cover of the underground heat exchanger according to the preferred embodiment of the present invention will be described in detail. Explain.

First, a predetermined construction surface is excavated, a slurry wall is formed and an excavation portion for embedding the underground heat exchanger 10 is filled, and the excavation portion is filled with a high density stabilizer including bentonite or the like so as not to collapse (s100). ). That is, such an excavation forming process and a stabilizer filling process are performed simultaneously.

Next, a cover according to the present invention is installed at the end of the underground heat exchanger 10 to be embedded (s200). More specifically, after the spacer 100 is interposed between the pair of heat exchange tubes 11 at the ends of the underground heat exchanger 10, the opening 312-1 and the opening 210 are pressurized and expanded. The pair of heat exchange tubes 11 having the spacer 100 interposed therebetween are inserted into the buffer 200.

The first fastening member 321 is rotated so that the locking projection 322-1 of the second fastening member 322 is inserted into the locking hole 321-1 of the first fastening member 321 so as to be caught. 300 is fixed in a state in which the outer peripheral surface of the buffer 200 is pressed.

At this time, when the position of the cover with respect to the end of the underground heat exchanger 10 is necessary to hold the support pillar 311 of the cover body 310 by applying a force to the upper or lower side without the buffer 200 is not bent. The position of the cover can be adjusted easily.

Subsequently, the rebar network 30 for securing the strength of the underground heat exchanger 10 and the slurry wall 20 in which the cover is installed in the excavation part filled with the stabilizer is installed (s300).

Then, while recovering the stabilized liquid from the excavation portion to fill the concrete in the excavation portion at the speed and curing to form a slurry wall (s400).

Next, the upper end concrete 21 formed with low strength while mixing impurities such as a stabilizer and a suspended matter is crushed and removed by a crusher (s500). At this time, the cover installed at the end of the underground heat exchanger 10 blocks the crusher and the heat exchanger tube 11 from contact with each other, absorbs and cushions the shock transmitted from the crusher to the heat exchanger tube 11, and a pair of heat exchanger tubes ( By keeping the 11) spaced apart from each other, the end of the underground heat exchanger 10 is safely protected.

Thereafter, after collecting the cover at the end of the underground heat exchanger 10 (s600), the construction is completed by pouring concrete with high strength onto the surface of the slurry wall 20 (s700).

Here, the work of recovering the cover at the end of the underground heat exchanger 10 may be made as needed, and the concrete is placed on the surface of the slurry wall 20 with the cover installed at the end of the underground heat exchanger 10 as it is. You can also proceed.

As described above, according to the cover for protecting the end of the underground heat exchanger according to the present invention, the underground heat exchanger and the spacer 100 for maintaining a pair of heat exchange tubes 11 at the ends of the underground heat exchanger 10 at regular intervals. Shock absorber 200 is provided to surround the end of the machine 10 to effectively protect the end of the underground heat exchanger 10 during the shredding removal process of the upper concrete, while the shock absorber 200 has an expandable opening 210. ) Is formed and is provided with a fixing part 300 that can simply fix or release the buffer 200 to the end of the underground heat exchanger 10, the fixing part 300 is a buffer 200 By including a cover body 310 including a support pillar 311 to be supported not to bend by holding the cover body 310 in the state installed at the end of the underground heat exchanger 10 to adjust the installation position stably Can be installed and done That can be done very simply and quickly.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, and such modifications and variations belong to the appended claims. will be.

Description of the Related Art [0002]
100: spacer 110: groove portion
200: buffer 210: opening
300: fixed part 310: cover body
311 support pillar 312 casing
312-1: opening 320: fastening member
321: first fastening 321-1: locking hole
322: Second fastening 322-1: Jamming projection
10: underground heat exchanger 11: heat exchanger tube
20: slurry month 21: upper concrete
30: rebar network

Claims (5)

A cover that is temporarily installed at the end of the underground heat exchanger to protect the end of the underground heat exchanger from being damaged during the crushing removal work of the upper concrete mixed with impurities,
A spacer provided between the pair of heat exchanger tubes at the end of the underground heat exchanger to maintain the pair of heat exchanger tubes spaced apart from each other;
It is made of a material having elasticity and provided in the shape of a sleeve formed with an opening in the longitudinal direction, it is delivered to the pair of heat exchanger tube wrapped around the pair of heat exchanger tube and the spacer inserted to extend the opening Shock absorbers; And
And a fixing part for fixing the buffer body so as not to be separated while surrounding the pair of heat exchange tubes and the spacer.
The fixing part may include a cover body provided in a sleeve shape having an opening formed along a longitudinal direction corresponding to the shock absorber and fixed to an outer circumferential surface of the shock absorber, and the opening may expand as the opening is expanded; And
A fastening member which is installed at both sides of the opening of the cover body and fixes the opening so as not to expand so that the cover body can be fixed while pressing the outer circumferential surface of the buffer body. End protection cover. The method of claim 1,
The spacer
And a pair of grooves into which the pair of heat exchange tubes are inserted, respectively, and formed of an elastic material to mitigate an impact. delete The method of claim 1,
The fastening member
A first fastening body rotatably installed at one side of the opening of the cover body and having a predetermined locking hole; And
A second fastening member provided at the other side of the opening of the cover body and having a locking protrusion inserted into and fixed to the locking hole;
End protection cover of the underground heat exchanger comprising a. The method of claim 1,
The cover body
A support pillar fixed to the buffer body in a longitudinal direction to support the buffer body not to bend in the longitudinal direction;
A pair of casings each of which is provided at both ends in the width direction of the support pillar to form the opening between the ends thereof, and is made of an elastic material so as to be bent relative to the support pillar;
Cover for protecting the end of the underground heat exchanger comprising a.
KR1020110090286A 2011-09-06 2011-09-06 Cover for protecting end of geothermal heat exchange pipe KR101323272B1 (en)

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Application Number Priority Date Filing Date Title
KR1020110090286A KR101323272B1 (en) 2011-09-06 2011-09-06 Cover for protecting end of geothermal heat exchange pipe

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KR101323272B1 true KR101323272B1 (en) 2013-10-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101448202B1 (en) 2013-03-08 2014-10-07 박민혜 A Tube For Energy Pile
KR20200124985A (en) * 2019-04-25 2020-11-04 조희남 A weight unit or high depth geothermal pipe using u band and method for constructing high depth geothermal pipe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060106014A (en) * 2005-04-04 2006-10-12 신아산업주식회사 Double pipe to keep the temperatare
JP2011512473A (en) * 2007-12-24 2011-04-21 マン・ディーゼル・アンド・ターボ・エスイー Sealed segment and sealed segment structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060106014A (en) * 2005-04-04 2006-10-12 신아산업주식회사 Double pipe to keep the temperatare
JP2011512473A (en) * 2007-12-24 2011-04-21 マン・ディーゼル・アンド・ターボ・エスイー Sealed segment and sealed segment structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101448202B1 (en) 2013-03-08 2014-10-07 박민혜 A Tube For Energy Pile
KR20200124985A (en) * 2019-04-25 2020-11-04 조희남 A weight unit or high depth geothermal pipe using u band and method for constructing high depth geothermal pipe
KR102260224B1 (en) * 2019-04-25 2021-06-02 조희남 A weight unit or high depth geothermal pipe using u band and method for constructing high depth geothermal pipe

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