KR19990079841A - Dual steel pipe - Google Patents

Abstract

The present invention relates to a double steel pipe for keeping warm / cold, and the inner tube (4) made of a steel pipe to which a fluid of a constant temperature is transferred, and the outer peripheral surface of the inner tube (4) is wrapped in a certain thickness to prevent heat conduction of the inner tube (4) Insulating material (6) provided so as to be fixed to the upper and lower sides of the outer peripheral surface of the heat insulating material (6) and the insulating member provided to be wrapped to prevent heat loss on the outer peripheral surface of the clamp member (8) 16 and a plurality of pipe supports 18 provided on one side of the outer circumferential surface of the clamp member 8 to induce movement of the inner pipe 4 during thermal expansion of the inner pipe 4 and one side of the pipe support 18. In contact with the inner circumferential surface, and forms a double steel pipe (2) consisting of a steel pipe appearance (30), the double steel pipe (2) and the pipe end connecting member 40 required for the construction of the double steel pipe (2) and Wall passing member 60, characterized in that provided with a fixing member (90) do. Such a double steel pipe can be easily transferred to the fluid at a constant temperature while preventing heat loss, and can be directly buried without installing a joint hole when the pipe is buried. Other facilities, that is, a pipe end connecting member, a wall passing member, and a fixing member It is easily installed, so the use range of double steel pipe is widened, construction period is shortened, construction cost is reduced, and heat loss is very low, so energy use efficiency is high, which reduces the operating cost.

Description

Double Steel Pipe for Insulation / Insulation

The present invention relates to a warm keeping / cooling dual steel pipe, and more particularly, to a warming / cooling double steel pipe used when transporting a fluid at a constant temperature, that is, high or low temperature over a long distance. It is about.

In general, the thermal insulation / cooling method of the steel pipe currently used is to construct the inner pipe (steel pipe) according to the piping route, and the method of thermal insulation / cooling construction with insulation or insulation material in the field and the double insulation pipe used for district heating Polyurethane foam is used between a steel pipe and a high-density polyethylene pipe which is an external appearance.

However, among the thermal insulation / cooling methods of the inner pipe, the field insulation method must be installed on the ground, and if it is inevitable to be installed underground, it is necessary to dig up the ground to make a cavity and construct a pipe in the cavity. Joint space is larger than necessary due to the securing of work space, increase construction cost, delay of construction period, as well as auxiliary equipment such as exhaust equipment, lamp installation for the future maintenance, the insulation of the inner pipe only as insulation 1 Because of the thermal insulation, the heat loss through the insulation increases after some use, resulting in a large energy loss. In addition, since the service life of the pipe is shorter than 10 years, the maintenance cost is increased due to frequent maintenance, and there are many problems in that a thermal expansion fixing device for fixing the movement of the pipe due to thermal expansion and contraction of the inner pipe must be installed as a separate structure.

In addition, the district heating double insulation tube has a narrow usage range because its temperature range is -10 ℃ ~ 120 ℃, and only the primary insulation is made of polyurethane foam to increase the heat loss due to the thermal conduction of the insulation. In the case of a lot of problems caused by moisture infiltration, there was a hassle to install a thermal expansion fixing device as a separate structure.

The present invention has been made to solve the problems of the prior art as described above, the use temperature range can be used at cryogenic temperatures up to 600 ℃, can be directly buried without installing a joint hole when laying the pipe, and easy to install other equipment It is provided with a heat insulating material and a heat insulating material that can be installed easily, and maintains the space between the inner tube and the exterior as a vacuum layer to minimize heat loss, thereby providing a double steel pipe for thermal insulation / cold storage to increase energy use efficiency. have.

The technical configuration of the present invention for achieving the above object is an inner tube made of a steel pipe to which a fluid of a constant temperature is transferred, the outer peripheral surface of the inner tube is provided with a predetermined thickness to prevent heat conduction of the inner tube, and the heat insulating material The clamp member is fixed to the upper and lower outer peripheral surface, the insulating member is wrapped on the outer peripheral surface of the clamp member to prevent heat loss, and one side of the outer peripheral surface of the clamp member is provided to induce the movement of the inner tube during thermal expansion of the inner tube A plurality of pipe supports and one side of the pipe support are in contact with the inner circumferential surface thereof, characterized in that a double steel pipe formed of a steel pipe appearance is formed.

In addition, the space between the insulating material and the appearance of the double steel pipe is characterized in that the vacuum layer is formed to prevent heat conduction due to convection phenomenon to obtain the warming and cooling effect.

One end of the double steel pipe is provided with an inner tube and the outer end of the pipe connection member consisting of the outer, the one end of the tube end connection member is the air introduced into the vacuum layer after the installation of the pipe to maintain the vacuum layer of the double steel pipe A vent provided to pull out, and one side of the exterior spaced from the vent and the outlet provided to discharge water introduced between the inner tube and the outer tube of the double steel pipe that may occur during piping construction, and the thermal expansion of the inner tube on the outer peripheral surface of the inner tube Or a bellows tube provided to absorb the amount of expansion or contraction generated during contraction to maintain the vacuum layer at a constant vacuum pressure, and to prevent heat loss of a constant temperature fluid flowing through the inner tube on the inner side and the inner side of the bellows tube. Specially formed tube end connection member made of a heat insulating material wrapped around the outer peripheral surface of the inner tube Gong.

When the underground buried pipe of the double steel pipe when passing through the manhole wall or concrete wall during the ground construction is provided with a heat insulating / cold insulating wall passing member consisting of an inner pipe connected to one end of the double steel pipe, the outer side of the passage member A vent provided to extract the air introduced into the vacuum layer after the installation of the pipe so that the vacuum layer of the double steel pipe is maintained, and one side of the exterior spaced from the vent pipe discharges water introduced between the inner pipe and the exterior of the double steel pipe during piping construction. A discharge port provided to allow the outer peripheral surface of the exterior spaced apart from the vent and the discharge port to be in direct contact with the wall through the wall, and one end of the sleeve prevents damage to the wall by the minute thermal expansion of the exterior. Appearance is provided to completely block the exterior and the sleeve to prevent the ingress of water or foreign matter A bellows pipe provided with an absorbing part, one side of which is inserted into the outer surface, and provided on an outer circumferential surface of the inner tube, the vacuum layer being maintained at a constant vacuum pressure by absorbing the amount of expansion or contraction generated during thermal expansion or contraction of the inner tube; The inner side of the bellows tube and the inner side of the exterior is characterized in that the wall passing member made of a heat insulating material is provided on the outer peripheral surface of the inner tube to prevent heat loss of the fluid of a constant temperature flowing through the inner tube.

An expansion pipe or an expansion force generated when the inner tube of the double steel pipe is expanded or contracted is provided with a fixing member installed between the inner pipe and the exterior so as to act as a thermal expansion / shrinkage compensation device. The outer plate is spaced apart from the outer circumferential surface of the inner tube and the inner circumferential surface of the outer surface, and one side of the outer plate and the front and rear surfaces of the outer plate are fixed to the inner circumferential surface of the outer surface while pressing one side of the outer plate. A plurality of exterior brackets provided to be fixed to each other, an insulating material provided to block heat conduction on the front and rear surfaces of the exterior plate, and an inner tube plate provided on one surface of the insulating material and configured to have the same shape as the insulating material; Front and back sides of the inner tube plate, one side is fixed to the outer peripheral surface of the inner tube while the inner tube play A plurality of inner tube brackets provided to press and fix the fixing member, and a fixing member made of a heat insulating material wrapped around the outer circumferential surface of the inner tube to block heat conduction of the inner tube between the inner tube brackets to support thermal expansion or contracting force. ) Is formed.

Figure 1 is a half cross-sectional view showing one double steel pipe for keeping warm / cold according to the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is an enlarged view illustrating main parts of the part “B” of FIG. 2; FIG.

Figure 4 is a half sectional view showing a pipe end connection member provided in a double steel pipe according to the present invention;

Figure 5 is a half sectional view showing a wall passing member provided at the time of passing the wall of the double steel pipe according to the present invention.

6 is a view showing a thermal expansion fixing member provided in the double steel pipe according to the present invention

7 is a cross-sectional view taken along the line C-C of FIG.

8 is a cross-sectional view taken along the line D-D of FIG.

Explanation of symbols on the main parts of the drawings

2: double steel pipe 4: inner pipe

6: insulation material 8: clamp member

10: fastening part 12: bolt

14: nut 16: insulation

18: Piping support 20: Lug

22: fastening pin 24: roller

26: vacuum layer 28: leak detection unit

30: Appearance 40: Tube end connection member

42: interior 44: bellows pipe

46a and 46b: ring plate 48 and 50: insulation

52: Appearance 54a: Ventilation

54b: outlet 60: passing member

62: inner tube 64: bellows tube

66a, 66b, 66c: ring plate 68, 70: insulation

72: appearance 74a: vent

74b: outlet 76: sleeve

78: elastic stretch absorbing portion 80: elastic ring

82: water stopper 90: anchor

92: inner tube 94: insulation

96: exterior plate 98: insulation

100: inner tube plate 102: inner tube bracket

104: exterior bracket 106: exterior

120: wall

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a half cross-sectional view showing a heat insulating / cold insulating double steel pipe according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a part “B” of FIG. 2. It is an enlarged view.

As shown, the double steel pipe (2) for delivering a constant temperature fluid to the destination while preventing heat loss has an inner tube (4) of the steel pipe through which the fluid of a constant temperature flows, the outer peripheral surface of the inner tube (4) It is wrapped with a predetermined thickness is provided with a heat insulating material 6 to prevent heat conduction of the inner tube 4, the clamp member 8 is provided on the outer peripheral surface of the heat insulating material 6, the lower side is fastened.

Fastening parts 10 are formed at both ends of the clamp member 8, respectively, and bolts 12 are inserted into the fastening parts 10 to be fastened by nuts 14 to fix the clamp members 8. Let's do it.

In addition, the outer peripheral surface of the clamp member 8 is provided with a heat insulating material 16 to prevent heat loss, and the four-way piping support 18 spaced at an angle of 90 degrees on the outer peripheral surface of the clamp member 8. Is provided to smoothly induce the movement of the inner tube 4 during thermal expansion of the inner tube 4 by the fluid of a constant temperature flowing in the inner tube 4, one side of the pipe support 18 is made of a steel pipe (30) It is provided to contact the inner peripheral surface of the.

The pipe support 18 smoothly induces the movement of the inner tube 4 during thermal expansion by a fluid having a constant temperature flowing in the inner tube 4 to maintain a constant distance between the inner tube 4 and the exterior 30 to be described later. The lug 20 is maintained on one side of the outer peripheral surface of the clamp member 8 in order to maintain the vacuum layer 26 at a predetermined interval and to protect the heat insulating material 16 provided on the outer peripheral surface of the inner tube 4 from the weight of the inner tube 4. One end of the lug 20 is fixed by welding, and the front end of the lug 20 is rotatably hinged by a fastening pin 22, and one side of the lug 20 is in contact with the inner circumferential surface of the outer case 30 during thermal expansion of the inner tube 4. The roller 24 is provided.

In addition, the shape of the pipe support 18 may be selectively used among four directions spaced at an angle of 90 degrees and three directions spaced at an angle of 120 degrees according to the diameter and weight of the inner tube 4.

On the other hand, the embedding of the double steel pipe (2) is coated with asphalt or polyethylene on the surface of the exterior 30 to prevent any corrosion in the soil by chemical corrosion or potential difference can be used semi-permanently.

In the space portion between the heat insulating material 16 and the exterior 30 of the double steel pipe 2, a vacuum layer 26 is formed to prevent heat conduction due to convection and to obtain a perfect warming and cooling effect. One side of the vacuum layer 26 is provided with a leak detection unit 28 to detect the leakage of the fluid flowing in the inner tube (4) to easily detect the damage of the inner tube (4).

The vacuum layer 26 is a space formed at regular intervals by the pipe support 18 provided between the heat insulating material 16 and the exterior 30, and in order to minimize the heat loss in the vacuum layer 26 or less 1 mbar or less It is formed by vacuum.

4 is a half sectional view showing a pipe end connecting member provided at the end portion of the double steel pipe according to the present invention. As shown in the drawing, a valve or other facility is installed in the inner pipe 4 of the double steel pipe 2. Insulating pipe is provided with a heat insulating / cold insulating tube end connecting member 40 consisting of an inner pipe 42 and the outer 52 at one end of the double steel pipe (2) at the end of the double steel pipe (2) hardly possible to install Thus, the inner tube 4 and the inner tube 42, the outer 30 and the outer 52 are welded to each other and installed.

In order to maintain the vacuum layer 26 of the double steel pipe 2 on one side of the outer surface 52 of the pipe end connecting member 40, a general vacuum pump (not shown) to remove the air introduced into the vacuum layer 26 after installation of the pipe. A vent (54a) connected to the suction port of the si) is welded and provided on the bottom surface of the exterior (52) on the opposite side of the vent (54a) during the construction of the inner tube (4) and the exterior (30) of the double steel pipe (2). A discharge port 54b for discharging water which may flow in between is provided by welding.

In addition, the outer peripheral surface of the inner tube 42 of the tube end connecting member 40 absorbs the amount of expansion or contraction generated during thermal expansion or contraction of the inner tube 4 and 42 to protect the vacuum layer 26 at a constant vacuum pressure. The bellows pipe 44 is provided. Both ends of the bellows pipe 44 are provided with ring plates 46a and 46b for fixing the bellows pipe 44 to the inner pipe 42 and the outer shell 52, respectively. The ring plate 46a provided in the bellows pipe 44 and the outer circumferential surface of the inner pipe 42 are welded and fixed, and the other end of the ring plate 46b of the bellows pipe 44 and the outer circumferential surface of the bellows pipe 44 It is welded to one end and fixed.

In addition, inside the bellows pipe 44 and the inside of the exterior 52, the heat insulating members 48 and 50, which are intended to prevent heat loss of the fluid at a constant temperature flowing through the inner pipe 42, are wrapped around the outer circumferential surface of the inner pipe 42. It is provided.

5 is a half sectional view showing a wall passing member provided when the wall passes through the double steel pipe according to the present invention. As shown, in the case of the underground buried pipe of the double steel pipe 2, the manhole wall 120 is shown. ) Or in the case of ground construction, when passing through the general concrete wall 120, the inner pipe having a heat insulating / cold-walled wall passing member 60 consisting of an inner tube 62 and the exterior 72 at one end of the double steel pipe (2) (4) and the inner tube 62, the exterior 30 and the exterior 72 are connected to each other by welding.

On one side of the outer surface 72 of the passage member 60, a vent hole 74a for extracting air introduced into the vacuum layer 26 is welded after the pipe is installed so that the vacuum layer 26 of the double steel pipe 2 is maintained. The outlet 74b is provided on the bottom of the exterior 72 spaced apart from the vent 74a to discharge water that may flow between the inner tube 4 and the exterior 30 of the double steel pipe 2 during the piping construction. Is provided by welding.

In addition, the outer circumferential surface of the exterior 72 spaced a predetermined distance from the vent 74a and the outlet 74b is provided with a sleeve 76 through the wall 120 to be in direct contact with the wall 120, the sleeve At one end of the 76, the thermal expansion of the microscopic appearance 72 is directly transmitted to the wall 120 to completely block the exterior 72 and the sleeve 76 to prevent damage to the wall 120 generated. 120) The outer and outer elastic absorbing portion 78 to completely block the water or other foreign matter that can be introduced into the sleeve 76 is provided to protrude.

Meanwhile, an elastic force is applied to the sleeve 76 between the sleeve 76 and the exterior 72, and a plurality of elastic rings 80 interposed to prevent deformation and breakage of the sleeve 76 are provided at a predetermined distance apart from each other. On the outer circumferential surface side of the sleeve 76, a ring-shaped water stopper 82 is provided to block water flowing in, such as a capillary phenomenon, into a minute gap between the sleeve 76 and the wall 120.

In addition, the bellows pipe 64 provided with the most inserted into the exterior 72 is provided on the outer circumferential surface of the inner tube 62 and is fixed. On one side of the bellows pipe 64 in contact with both ends of the bellows pipe 64 and one end of the facade 72, a ring plate for fixing the bellows pipe 64 to the inner pipe 62 and the facade 72, respectively. 66a, 66b and 66c are provided, the ring plate 66a provided at one end of the bellows pipe 64 is welded and fixed to one end of the bellows pipe 64 and one outer circumferential surface of the inner pipe 62, and the other end thereof. The ring plate 66c provided in the bellows tube 64 protects the thermal insulation material 68 between the inner tube 62 and the bellows tube 64 and moves the inner tube 62 during thermal expansion or contraction of the inner tube 62. ) Weld only to the inner surface, and the outer peripheral surface of the inner tube 62 has a slight gap to facilitate the movement of the inner tube 62, and the ring plate 66b on one side of the bellows tube 64 of the bellows tube 64 The outer peripheral surface is welded to one side and one end of the exterior (72) is fixed.

In addition, the bellows pipe 64 performs the same function as the bellows pipe 44 of the pipe end connecting member 40 described above to protect the vacuum layer 26 of the double steel pipe 2 to be maintained at a constant vacuum pressure. do.

In addition, inside the bellows pipe 64 and the inside of the exterior 72, thermal insulation materials 68 and 70 which protect the temperature of the fluid having a constant temperature flowing through the inner pipe 62 from the outside temperature to prevent heat loss are provided with the inner pipe ( 62) is wrapped around the outer peripheral surface.

The thermal insulation material 68 and 70 serve the same purpose and role as the thermal insulation material 16 of FIG. 2 and the thermal insulation material 48 and 50 of FIG. 4.

6 is a view illustrating a thermal expansion fixing member provided in the double steel pipe according to the present invention, FIG. 7 is a cross-sectional view taken along the line C-C of FIG. 6, and FIG. 8 is a cross-sectional view taken along the line D-D of FIG.

As shown in the figure, the inner tube 92 and the outer tube which allow the inner tube 4 of the double steel pipe 2 to act as a thermal expansion and contraction compensator (not shown). An inner tube 4 and an inner tube 92, an outer tube 30, and an outer tube 106 are welded to the double steel tube 2 to the fixing member 90 formed of 106.

An inner tube 92 penetrates to an inner portion of the outer side 106 of the fixing member 90, is spaced a predetermined distance from an outer circumferential surface of the inner tube 92, and has a diameter smaller than that of the outer side 106. Its upper and lower ends are provided with an exterior plate 96 cut into a predetermined size so as to facilitate the operation during the vacuum treatment operation or the foreign matter drainage operation, the front and rear sides of the exterior plate 96 has an appearance ( One side is welded and fixed to the inner circumferential surface of the 106 is provided with a plurality of exterior brackets 104 for pressing and fixing the exterior plate 96 in front and rear.

The exterior bracket 104 is installed at a position shifted by 45 degrees from a vertical position of the exterior 106, and the remaining exterior bracket 104 is installed at 90-degree intervals from the initial installation position.

In addition, the front and rear surfaces of the exterior plate 96 are provided with the same shape as the shape of the inner tube plate 100 to be described later to the heat insulating material 98 to block the heat conduction, one side of the heat insulating material 98 An inner tube plate 100 having the same shape as the heat insulating material 98 is provided.

In addition, a plurality of inner tube brackets for pressing the inner tube plate 100 on the front and rear sides of the inner tube plate 100 by pressing and fixing the inner tube plate 100 at the front and rear surfaces thereof while the one side is welded and fixed to the outer circumferential surface of the inner tube 92 ( 102 is provided.

The inner tube bracket 102 is installed at a position offset from the outer bracket 104 by 45 degrees, that is, a vertical or horizontal position of the outer tube 106 or the inner tube 92, and the remaining inner tube bracket 102 is used for the outer tube. Like the bracket 104 is installed spaced at intervals of 90 degrees.

In addition, the heat insulating material 98 is the temperature of the fluid of a certain temperature flowing in the inner tube 92 is transmitted to the inner tube plate 100 through the inner tube bracket 102, the transferred temperature is the exterior plate 96 Blocks the heat transmitted to the exterior bracket 104 through the outside, and the expansion and contraction force generated during thermal expansion or contraction of the inner tube (4,92), and the weight and inner tube of the inner tube (4,92) 92, it has a compressive strength greater than the frictional force generated by the weight of the fluid flowing in.

Then, between the inner tube bracket 102 is provided with a heat insulating material 94 wrapped around the outer peripheral surface of the inner tube 92 to block the heat conduction of the inner tube 92 to prevent heat loss.

Thermal insulation / cold storage double steel pipe (2) according to the present invention configured as described above is attached to the outer peripheral surface of the inner pipe (4) made of steel pipe, the thermal conductivity is low, and the thermal insulation material 6 with little temperature deformation through a predetermined adhesive material The upper and lower outer peripheral surfaces of the heat insulator 6 are formed with fastening portions 10 protruding from both ends thereof, and a lug 20 is welded and fixed to one side thereof, and fastening pins are formed at the ends of the lugs 20. 22 is provided with a clamp member (8) having a roller (24) rotatably hinged through the fastening member (10) to fasten the fastening portion (10) of the clamp member (8) with a bolt (12) and a nut (14). Fix it. At this time, the maximum diameter of the pipe support 18 is provided to be smaller than a predetermined diameter, that is, approximately 10 mm smaller than the inner diameter of the outer appearance (30).

The insulating member 16 is attached to the outer circumferential surface of the clamp member 8 by a predetermined band knot, and the roller 24 of the pipe support 18 provided in the clamp member 8 is The heat insulating material 16 is protruded to the outside.

On the other hand, the space portion formed between the exterior 30 and the heat insulating material 16 to vacuum the vacuum layer 26 to minimize the heat loss due to convection phenomenon to less than 1 mbar, leaks on one side of the vacuum layer 26 formed as described above Install a leak detection unit 28 made of a detection line.

Then, when the double steel pipe (2) configured as described above is completed, the double steel pipe (2) is to supply the fluid of a constant temperature flowing in the inner pipe (4) to the final transfer destination, where the fluid is the inner pipe (4) ), The heat loss of the fluid through the pipe support 18 is primarily prevented by the heat insulating material 6 provided on the outer circumferential surface of the inner tube 4, and is provided on the outer circumferential surface of the clamp member 8. The heat insulating material 16 prevents heat loss of the fluid flowing in the inner tube 4 secondary. In addition, the vacuum layer 26 formed between the heat insulating material 16 and the exterior 30 prevents heat conduction due to convection and thereby prevents heat loss of the fluid flowing in the inner tube 4 in a third manner. 2) has the perfect warmth and coldness effect.

When the thermal expansion of the inner tube 4 occurs due to the temperature of the fluid flowing in the inner tube 4 of the double steel tube 2, the roller 24 of the pipe support 18 having one end fixed to the clamp member 8 is Since the thermal expansion force of the inner tube 4 is applied to the inner circumferential surface of the outer shell 30 with a very small friction force, the vacuum layer 26 between the outer shell 30 and the heat insulating material 16 at regular intervals. It can be maintained. In addition, the heat insulating material 16 provided on the outer circumferential surface of the inner tube 4 is protected from sagging or deformation caused by the weight of the inner tube 4.

In addition, in the installation of the valve or other facilities in the inner pipe (4) of the double steel pipe (2) in the pipe made of double steel pipe (2) it is hardly possible to install a pipe end connecting member 40 to the double steel pipe (2) One end of the connection is to install a valve or other equipment, the pipe end connecting member 40 is welded to the inner pipe 42 of the inner pipe 4 and the pipe end connecting member 40 of the double steel pipe (2) and , And the outer surface 52 of the pipe end connecting member 40 and the outer surface 30 of the double steel pipe (2) by welding.

Then, when air is introduced into the vacuum layer 26 of the double steel pipe (2) at the time of installation, by connecting the vacuum pump suction port to the vent (54a) provided on one side of the outer surface 52 of the pipe end connecting member 40 The air introduced into the vacuum layer 26 is drawn out, and when water is introduced between the inner tube 4 and the outer tube 30 of the double steel pipe 2 during the piping construction, the water is discharged through the outlet 54b. do.

Thus, between the inner tube 42 and the outer tube 52 of the tube end connecting member 40 is the same vacuum as the vacuum layer 26 of the double steel pipe (2).

In addition, when the thermal expansion or contraction of the inner tube (4,42) is the expansion force or contraction force acts in the axial direction, at this time the bellows pipe 44 provided in the tube end connecting member 40 absorbs the amount of expansion or contraction The vacuum layer 26 of the double steel pipe 2 is kept at a constant vacuum pressure. This is because the amount of thermal expansion and contraction of the inner tubes 4 and 42 is large due to the fluid flowing in the inner tubes 4 and 42, and the outer surfaces 30 and 52 are blocked by the heat insulating material 16 and 50 and the vacuum layer 26. The thermal expansion or shrinkage is relatively small compared to the inner tube (4, 42), because both ends of the bellows pipe 44 is fixed to the inner tube 42 and the outer shell 52, respectively, expansion of the inner tube (4, 42) In addition, the amount of expansion or contraction acting in the axial direction during contraction is transmitted to the bellows tube 44 fixed to one side of the outer circumferential surface of the inner tube 42 as it is. Accordingly, one side of the bellows pipe 44 is moved along the inner pipes 4 and 42, but the other side of the bellows pipe 44 is fixed to the exterior 52 so that the bellows of the middle portion of the bellows pipe 44 is fixed to the inner pipes 4 and 42. It expands or contracts by the amount of movement. Thus, the vacuum layer 26 of the double steel pipe 2 because the bellows pipe 44 is compensated for each other as the bellows pipe 44 moves in the axial direction to compensate for the difference between the amount of expansion or shrinkage between the inner pipes 4 and 42 and the outer pipes 30 and 52. Maintains a constant vacuum pressure.

On the other hand, when the underground pipes of the double steel pipe (2) when passing through the manhole wall 120 or the general concrete wall 120 during the ground construction, the wall passing member 60 is installed at one end of the double steel pipe (2) The wall passing member 60 welds the inner pipe 4 of the double steel pipe 2 and the inner pipe 62 of the wall passing member 60, and the exterior 72 of the wall passing member 60 and the double wall. The exterior 30 of the steel pipe 2 is welded and installed.

At the time of installation of the wall passing member 60, first, the wall passing member 60 is welded and installed on one end of the double steel pipe 2 as described above, and the exterior 72 of the wall passing member 60 is installed. The manhole wall 120 or the general concrete wall 120 is installed in the sleeve 76 provided on the outer circumference, and the water stopper 82 provided in the sleeve 76 is positioned inside the wall 120. The outer side of the sleeve 120, the elastic stretch absorbing portion 78 of the sleeve 76 is in close contact with the construction.

Then, the sleeve 76 is pressed while being pressed against the wall 120 to prevent the minute thermal expansion of the double steel pipe 2 from being transmitted to the wall 120 to prevent damage to the wall 120 and the sleeve 76. Since the elastic stretch absorbing portion 78 of the outer shell is welded between the outer shell 72 and the sleeve 76, water or other foreign matter is prevented from entering the wall 120 during construction.

In addition, the elastic ring 80 provided inside the sleeve 76 prevents deformation and breakage of the sleeve 76 while adding elastic force to the sleeve 76, and water provided on an outer circumferential surface of the sleeve 76. The stopper 82 prevents leakage of the inside of the wall 120 by blocking water flowing in, such as a capillary phenomenon, into a minute gap between the sleeve 76 and the wall 120 at the time of construction or after construction of the wall passing member 60. do.

In addition, after constructing the wall passing member 60 as described above, the air inlet 74a protruding air introduced into the vacuum layer 26 of the double steel pipe 2 to the exterior 72 of the wall passing member 60. The vacuum suction pump is connected to and taken out, and when water is introduced between the inner tube 4 and the exterior 30 of the double steel pipe 2 during the piping construction, the water is discharged through the outlet 74b.

And, the bellows pipe 64 of the wall passing member 60 is the bellows pipe of the pipe end connecting member 40 described above the amount of expansion or contraction acting in the axial direction during thermal expansion or contraction of the inner pipe (4, 62). As shown in (44), the bellows pipe 64 is moved in the axial direction, and the vacuum layer of the double steel pipe 2 is compensated by mutually compensating the difference between the amount of expansion or contraction between the inner pipes 4 and 62 and the outer pipes 30 and 72. (26) Protection to maintain constant vacuum pressure.

In particular, when the underground buried of the double steel pipe (2) is coated with asphalt or polyethylene on the exterior 30 of the double steel pipe (2) to prevent any chemical corrosion or potential corrosion in any soil to be used semi-permanently. .

On the other hand, the fixing member 90 provided with the inner tube 4 and the inner tube 92, the exterior 30 and the exterior 106 welded to one side of the double steel pipe 2 is the inner tube (4) of the double steel pipe (2) ) Causes the expansion force or contraction force generated at the time of expansion or contraction to act on the thermal expansion / contraction compensation device (not shown). It is provided that both sides of the exterior plate 96 are provided with an insulating material 98 having a compressive strength greater than the expansion force or contraction force acting in the axial direction of the inner tube 4,92 when the inner tube 4,92 is expanded or contracted. Pressed by the inner tube plate 100 to be fixed, the inner tube bracket 102 for fixing the inner tube plate 100 is welded and fixed to the outer peripheral surface of the inner tube 92, the outer plate 96 Since the external bracket 104 for fixing the inner tube 104 is welded and fixed to the inner circumferential surface of the outer tube 106, the inner tube bracket 102 moves along the inner tube 4 and 92 when the inner tube 4 or 92 expands or contracts. In this case, the movement of the inner tube bracket 102 is prevented by the heat insulating material 98 and the outer bracket 104 interposed between the outer plate 96 and the inner tube plate 100, thereby preventing the inner tube. Movement of (4,92) is also blocked. Thus, the amount of expansion or contraction acting in the axial direction of the inner tubes 4,92 is acted on the side of the thermal expansion / contraction compensation device, and the thermal expansion force or contraction force is supported by the fixing member 90, and this support force is embedded Piping is offset by earth pressure.

Therefore, the double steel pipe 2 is transported while preventing the heat loss of the fluid of a constant temperature flowing in the inner pipe 4, the pipe end connecting member 40, the wall passing member 60, By the fixing member 90, the use range of the double steel pipe 2 is widened, and the construction period and the construction cost are reduced.

As described above, the thermal insulation / cold insulation double steel pipe of the present invention can easily transport the fluid of a constant temperature while preventing heat loss, the operating temperature range of the fluid flowing in the double steel pipe can be used from cryogenic to 600 ℃ When laying the pipe, it can be directly buried without installing the joint hole, and other equipment required for the construction of double steel pipe, that is, the pipe end connection member, wall passing member, and fixing member can be easily installed in the double steel pipe. The use range of steel pipe is widened, construction period is shortened, construction cost is reduced, and heat loss is very low, so the energy use efficiency is high.

Claims (8)

An inner tube 4 made of a steel pipe to which a fluid of a constant temperature is transferred, an inner heat insulating material 6 wrapped around the inner circumferential surface of the inner pipe 4 with a predetermined thickness to prevent thermal conduction of the inner pipe 4, and the heat insulating material 6 Clamp member 8 fixed to the upper and lower sides of the outer circumferential surface of the c), the insulating member 16 wrapped around the clamp member 8 to prevent heat loss, and the outer circumferential surface of the clamp member 8 On one side, a plurality of pipe supports 18 provided to induce movement of the inner pipe 4 during thermal expansion of the inner pipe 4, and one side of the pipe support 18 in contact with the inner circumferential surface of the outer pipe 30, Thermal insulation / cold storage double steel pipe, characterized in that formed a double steel pipe (2) consisting of. The method of claim 1, In the space portion between the heat insulating material 16 and the exterior 30 of the double steel pipe (2) and the vacuum layer 26 formed to prevent heat conduction due to convection phenomenon to obtain the warming and cooling effect, and the vacuum layer 26 On one side of the inner pipe (4) to detect the leakage of the fluid flowing in the inner pipe (4) is characterized in that the leakage detecting unit 28 is provided with a heat leakage / cold insulation double steel pipe. The method of claim 1, The pipe support 18 of the double steel pipe 2 induces the movement of the inner tube 4 during thermal expansion of the inner tube 4 to maintain a constant gap between the inner tube 4 and the outer tube 30 so that the vacuum layer 26 The lug 20 fixed to one side of the outer circumferential surface of the clamp member 8 and rotatably hinged to one end of the lug 20 by the fastening pin 22 so as to be maintained at regular intervals is provided on the inner circumferential surface of the exterior 30. Thermal insulation / cold storage double steel pipe, characterized in that the roller 24 is in contact with. The method of claim 1, One end of the double steel pipe (2) is provided with a heat insulating / cold insulating tube end connection member 40 consisting of an inner pipe 42 and the exterior 52, on one side of the exterior 52 of the pipe end connection member 40 A vent 54a provided to draw out the air introduced into the vacuum layer 26 after the pipe is installed so that the vacuum layer 26 of the double steel pipe 2 is maintained, and the exterior 52 spaced apart from the vent 54a. One side of the discharge pipe 54b provided to discharge the water introduced between the inner tube 4 and the outer tube 30 of the double steel pipe (2) during the construction of the pipe, and the inner pipe (4,42) on the outer peripheral surface of the inner pipe (42) Of the bellows pipe 44 provided to absorb the amount of expansion or shrinkage generated during thermal expansion or contraction) and to maintain the vacuum layer 26 at a constant vacuum pressure. The inner side is wrapped around the outer circumferential surface of the inner tube 42 to prevent heat loss of the fluid of a constant temperature flowing through the inner tube 42 Thermal insulation / cold storage double steel pipe, characterized in that the tube end connection member 40 made of a heat insulating material (48, 50) formed. The method of claim 1, When the underground pipe of the double steel pipe (2) when passing through the manhole wall 120 or the concrete wall 120 during the ground construction consists of an inner tube 62 and the exterior 72 connected to one end of the double steel pipe (2) It is provided with a heat insulating / cold wall passing member 60, the vacuum layer 26 after the installation of the pipe so that the vacuum layer 26 of the double steel pipe 2 is maintained on one side of the appearance 72 of the passing member 60. One side of the vent (74a) and the vent 72 (a) spaced apart from the vent (74a) provided to withdraw the air introduced into the inlet between the inner tube (4) and the exterior (30) of the double steel pipe (2) during piping construction The outlet 74b provided to discharge the purified water and the outer circumferential surface of the exterior 72 spaced a predetermined distance from the vent 74a and the outlet 74b penetrate the wall 120 to directly contact the wall 120. The sleeve 76 and the one end of the sleeve 76 to prevent damage to the wall 120, to prevent the inflow of water or foreign matter An outer elastic absorbing unit 78 provided to completely block the exterior 72 and the sleeve 76, and one side of the exterior 72 is inserted into the exterior 72 to be provided on the outer circumferential surface of the inner tube 62. A bellows tube 64 provided to absorb the amount of expansion or contraction generated during thermal expansion or contraction of the 62 and the vacuum layer 26 is maintained at a constant vacuum pressure, and the inside and the exterior of the bellows tube 64. ) Is formed inside the wall passing member 60 made of a heat insulating material (68, 70) wrapped around the outer circumferential surface of the inner tube 62 to prevent heat loss of the fluid at a constant temperature flowing through the inner tube (62) Double steel pipe for thermal insulation / cold insulation. The method of claim 5, An elastic ring 80 interposed between the sleeve 76 and the exterior 72 to add elastic force to the sleeve 76, and a sleeve 76 and a wall 120 at one side of the outer circumferential surface of the sleeve 76. Thermal insulation / cold storage double steel pipe, characterized in that the water stopper 82 is provided to block the water flowing into the fine gap therebetween. The method of claim 1, The inner tube 4 of the double steel pipe 2 is provided with a fixing member 90 is installed between the inner tube 92 and the exterior 106 so that the expansion force or contraction force generated when the inner tube 4 is expanded or contracted to act as a thermal expansion and contraction compensation device side. However, the inner tube 92 penetrates to the center portion of the inner side of the outer side 106 of the fixing member 90, and is spaced apart from the outer circumferential surface of the inner tube 92 and the inner circumferential surface of the outer side 106, and one side thereof is cut out. The exterior plate 96 and the front and rear sides of the exterior plate 96 are fixed to the inner circumferential surface of the exterior 106 while one side thereof is fixed to the exterior plate 96 by pressing. The exterior bracket 104 and the front and rear surfaces of the exterior plate 96 are provided with a heat insulating material 98 provided to block heat conduction, and are provided on one surface of the heat insulating material 98 to have the same shape as the heat insulating material 98. Inner tube plate 100 made of, before and after the inner tube plate 100 One side is fixed to the outer circumferential surface of the inner tube 92, while the inner tube bracket 102 is provided between the plurality of inner tube brackets 102 provided to press and fix the inner tube plate 100, and the inner tube 92 between the inner tube brackets 102. Thermal insulation / cold storage double steel pipe, characterized in that the fixing member 90 is formed to support the thermal expansion force or contraction force is made of a heat insulating material 94 is wrapped around the outer peripheral surface of the inner tube (92) to block the heat conduction. The method of claim 7, wherein The heat insulating material 98 of the fixing member 90 blocks the heat conduction, the expansion force and contraction force generated when the thermal expansion or contraction of the inner tube (4,92), and the self-weight and inner tube (4,92) of the inner tube (4,92) Thermal insulation / cold storage double steel pipe, characterized in that the compressive strength greater than the frictional force generated by the weight of the fluid flowing in the.