JP2869550B2 - Pit pipe penetration waterproofing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground pipe for district cooling and heating through which hot and cold water passes, in which a control device such as a valve provided in the pipe is housed in a pit, and a pipe insertion portion of the pit has a water blocking structure. The present invention relates to a waterproof device for a pit tube insertion portion for waterproofing.

[0002]

2. Description of the Related Art Conventionally, a control device such as a valve is provided in an underground pipe which is laid underground and through which cold or warm water for cooling and heating is passed and the pipe itself expands and contracts due to a change in temperature. A waterproof device is known in which this control device is accommodated in a pit for protection, and waterproofing is performed on a pipe insertion portion of the pit. The waterproofing device generally provided a steel pipe sleeve having a flange on the pit side in a pipe insertion hole opened to a pipe insertion portion of a pit, and formed a mortar waterproof layer between the steel pipe sleeve and the outer peripheral surface of the pipe line. Was something. In addition, in the case where the above-mentioned underground pipeline is a gas pipe, the present applicant provides a sheath pipe on the outer periphery of the pipeline inside the pit of the pit pipe insertion part, fills the sheath pipe with urethane resin, and It has been proposed that an O-ring is provided between the inner peripheral surface of the sheath tube on the end side and the outer peripheral surface of the conduit.

[0003]

By the way, the temperature of cold water flowing through the underground pipeline is about 5 ° C. and that of warm water is about 80 ° C. Due to the temperature difference, in the case of a 300 mmφ steel pipe, for example, It expands and contracts by about 10 mm in the length direction, and the construction with the conventional waterproofing device alone breaks the waterproofing device, resulting in insufficient followability, waterproofness, thermal efficiency, and the like. Water invades the pits, deteriorating the functions and workability of a control device such as a valve. The present invention has been made to solve the above problems.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an underground pipe for district cooling and heating through which cold and hot water passes, wherein a control device such as a valve provided in the pipe is housed in a pit. In the case where the pit pipe insertion portion is waterproofed to a waterproof structure, the pipe insertion portion has a primary water stop which fills a hole near the outer wall of the pit with mortar and seals externally, and a hole near the inner wall of the pit. A secondary water stop formed by multiple filling and curing of a urethane resin layer, a mortar layer, and an epoxy resin layer, and a heat insulating sheet surrounding the outer periphery of the pipe exposed from the inner wall of the pit to prevent expansion and contraction of the pipe A heat insulating layer that cuts off the influence, an annular O-ring surrounded around the heat insulating layer, a sheath tube fixed to the inner wall surface of the pit so that the O-ring is pressed tightly against the outer periphery of the tube body and pressed against it, Between the inner surface of the pipe and O-ring and the inner surface of the pit Characterized by comprising subjecting a means tertiary waterproofing consisting filled cured resin layer.

[0005]

According to the above arrangement, the present invention performs the following operations. Even if the pipe itself expands and contracts due to a temperature change caused by the passage of cold or warm water through the pipe, the heat insulating sheet exhibits the followability to the expansion and contraction, and the thermal efficiency does not deteriorate. Water that tries to enter the pit from the outside of the pit through the pipe insertion portion is reliably blocked by the primary, secondary, and tertiary water stops, and does not enter the pit. Therefore, it is possible to prevent a control device such as a valve housed in the pit from being immersed in water and deteriorating functions, workability, and the like. With the O-ring, waterproofness and followability are exhibited, and maintenance of the waterproof structure portion is also easily performed. Since the outer periphery of the tube is surrounded by the heat insulating sheet, rapid deterioration of the epoxy resin layer and the O-ring is prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. This embodiment relates to waterproofing when water leakage occurs in a pipe insertion portion of a pit of an existing pipeline or when leakage is prevented. In the figure, reference numeral 1 denotes a pipeline laid underground.
It is used for cooling or heating by passing cold water at about ℃ or warm water at about 80 ° C. The tube itself shrinks or expands due to the temperature change caused by the passage of cold or warm water, and its length is reduced. It expands and contracts about 10 mm in the direction. A valve 2 is provided in the middle of the pipe 1, and the valve 2 is housed in a pit 3 and protected.
The pipe insertion section 4 of the pit 3 is waterproofed.

In the pit 3, a pipe lower block 5 is placed on a foundation fixed with a foundation pile, grit stone, or the like.
Pipe surrounding block 6 consisting of blocks, upper block 7,
Straight wall block 8, sloping wall block 9, adjustment base block 1
0, the inner lid frame 11, the inner lid block 12 and the like are sequentially stacked,
An epoxy resin impregnated body is arranged and bonded to each joint, and at the same time, is waterproofed and formed into a manhole shape. An inner lid 13 with a cam lever is fitted to the inner lid frame 11 and the inner lid block 12, and the upper lid frame 1 is fixed by a plurality of upper lid frame fixing bolts 14 provided on the inner lid block 12.
The upper cover 16 is fitted to the upper cover frame 15. Further, the valve 2 is mounted on the pipe lower block 5 via a valve receiving base, an adjustment piece and the like.

The pipe surrounding block 6 is provided with a pipe insertion hole 17 having a diameter slightly larger than the diameter of the pipe 1 for inserting the pipes 1 and 1 on both sides of the valve 2.
A steel pipe sleeve 18 is fitted into the pipe insertion hole 17, and a flange 19 is integrally provided on the inner surface side of the pit 3 of the steel pipe sleeve 18. Inner surface of steel pipe sleeve 18 and pipe line 1
Existing waterproof layer 20 such as a mortar layer
Is provided approximately in the thickness of the block 6, and if water leaks into the pit 3 from here, waterproofing is performed, or even if water is not leaking, water leakage preventing construction is performed in advance.
In the case of new construction, almost the same waterproofing work is performed.

The existing waterproof layer 20 is cut off from the inside of the pit 3 by approximately half of its thickness, and a water-reaction type urethane resin 23 is provided on the end face between the outer circumference of the pipe 1 and the inner face of the steel pipe sleeve 18. Apply to thickness. The application of the water-reaction type urethane resin 23 may be omitted in the case of new construction. A hard heat insulating sheet 24 such as glass wool is surrounded by the exposed outer peripheral surface of the pipe line 1 in the pit 3, and the outer end thereof faces the inside of the pipe insertion hole 17. The mortar 25 is filled between the outer circumference of the pipe 1 including the end of the heat insulating sheet 24 and the inner surface of the steel pipe sleeve 18 to perform primary water stoppage. An epoxy mortar 26 is applied between the outer periphery of the heat insulating sheet 24 and the inner surface of the flange 19 of the steel pipe sleeve 18 and the inner surface of the pipe block 6 at the inner end of the pipe insertion hole 17.

On the other hand, the pipeline 1 and the flange 1 in the pit 3
A plurality of anchor bolts 27 are implanted in a circular shape at predetermined intervals in the pipe circumference block 6 located on the outer circumference of the pipe 9, and the outer circumference of each anchor bolt 27 and the flange 19 is impregnated with epoxy resin with respect to the pipe circumference block 6. The body 28 is bonded and waterproofed. A two-piece sheath tube 29 is attached to the anchor bolts 27 by tightening nuts 30, 30,. After the sheath tube 29 is attached, the sheath tube 2
An epoxy mortar 31 is filled in a groove formed in the block 6 on the outer peripheral portion of the block 6 on the outer peripheral portion of the epoxy resin impregnated body 28 at a portion facing the pipe surrounding block 6 and secondary water is stopped.
The sheath tube 29 is in confidential contact with the outer periphery of the pipe line 1 via the O-ring 32 and forms a predetermined space 33 with respect to the inner wall (flange 19) of the pit. Resin injection port 34 at the bottom, air vent 3 at the top
5 are provided. Then, while pressing and injecting the epoxy resin 36 from the resin inlet 34, the air vent 3
The space 33 is filled with the epoxy resin 36 under pressure while evacuating the space 33 from the space 5. When the pressure filling of the epoxy resin 36 is completed, the resin injection port 34 and the air vent 35 are closed, and the tertiary water is stopped to complete the waterproofing work. In addition,
The O-ring 32 adjusts the confidentiality by tightening or loosening the O-ring tightening frame 32b inserted through the bolt 32a with a nut 32c.

In the pipe 1 of the pit 3 which has been waterproofed by such a waterproofing device, cold water of about 5 ° C. or warm water of about 80 ° C. is passed through the pipe 1 to be used for cooling or heating. At this time, the tube itself contracts or expands due to a temperature change caused by passage of cold water or warm water, and slightly expands and contracts by about 10 mm in the length direction and in the circumferential direction.

The heat insulation sheet 24 particularly follows the contraction of the pipe line 1 in the pipe insertion portion 4 of the pit 3.
The waterproof layer 20, the water-reactive urethane resin 23, the epoxy mortar 26, the epoxy resin 36, the O-ring 32, and the like keep the confidentiality, and do not create a gap through which water passes through the tube insertion portion 4. Therefore, even if water outside the pit 3 tries to enter the pit through the pipe insertion part 4, the O-ring 32, the heat insulating sheet 24, the waterproof layer 20, the mortar 2
5, is prevented by the epoxy mortar 26, the epoxy resin 36, and the like, and is prevented from entering the pits 3, thereby maintaining good thermal efficiency.

In the sheath tube 29, the outer peripheral portions of the anchor bolts 27 and the flanges 19 are bonded and waterproofed to the pipe surrounding block 6 with an epoxy resin impregnated body 28, and the outer peripheral portion is formed on the outer periphery of the epoxy resin impregnated body 28. The groove formed in the block 6 is filled with epoxy mortar 31 for waterproofing. Further, the groove 6 is in tight contact with the outer periphery of the pipe 1 via an O-ring 32, and the flange 19 on the inner surface of the pit 3 and the steel pipe sleeve 18 A space 33 in a confidential state is formed, and the space 33 is filled with an epoxy resin 36 under pressure through a resin injection port 34 and an air vent 35, so that water intrusion from the tube insertion portion 4 is ensured. Will be blocked. The valve 2 housed in the pit 3 is prevented from being immersed in water and deteriorating the function, workability and the like.

[0014]

As described above, according to the waterproof device for a pit tube insertion portion of the present invention, the following effects can be obtained. Even if the pipe itself expands and contracts due to temperature changes caused by the passage of cold or warm water through the conduit, the heat insulation sheet will maintain the confidentiality and the thermal efficiency will deteriorate, especially with the heat insulating sheet. There is no. Water that tries to enter the pit from the outside of the pit through the pipe insertion portion is reliably blocked by the primary, secondary, and tertiary water stops, and does not enter the pit. Accordingly, it is possible to prevent an accident in which a control device such as a valve housed in the pit is immersed in water and the function, workability, and the like are deteriorated. By providing the O-ring, waterproofness and followability can be exhibited, and the O-ring can be removed to facilitate maintenance of the waterproof structure. Since the outer periphery of the tube is surrounded by the heat insulating sheet, rapid deterioration of the epoxy resin layer and the O-ring can be prevented by the heat insulating effect, and the durability of the water blocking structure can be increased.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part showing one embodiment of the present invention.

FIG. 2 is a side sectional view of an entire pit embodying the present invention.

FIG. 3 is a plan view of a sheath tube and an O-ring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Underground pipe 2 Valve 3 Pit 4 Pipe insertion part 6 Pipe block 17 Pipe insertion hole 18 Steel pipe sleeve 19 Flange 20 Mortar waterproof layer 23 Hydrolytic urethane resin 24 Hard heat insulation sheet 25 Mortar 26,31 Epoxy mortar 27 Anchor bolt 28 Epoxy resin impregnated body 29 Sheath tube 30 Nut 32 O-ring 33 Space 34 Resin injection port 35 Air vent 36 Epoxy resin

Claims (1)

(57) [Claims] 1. An underground pipe for district cooling and heating through which hot and cold water passes, wherein a control device such as a valve provided in the pipe is housed in a pit, and a pipe insertion portion of the pit is waterproofed to a waterproof structure. The above-mentioned pipe insertion part is filled with mortar in the hole near the outer wall of the pit to provide an external seal, and is filled with urethane resin layer, mortar layer, and epoxy resin layer in the hole near the inner wall of the pit. And a heat insulating layer surrounding the heat insulating sheet around the outer periphery of the pipe body exposed from the inner wall of the pit, thereby preventing the expansion and contraction action of the pipe body, and being surrounded by the heat insulating layer. An annular O-ring, a sheath tube fixed to the inner wall of the pit so that the O-ring is pressed tightly against the outer periphery of the tube, and filled and hardened between the inner surface of the sheath tube and the O-ring and the inner wall surface of the pit Tertiary water stopping means consisting of the resin layer A waterproof device for a pit tube insertion part, characterized in that: