JPH04339919A - Water-proof device for pipe inserting section for pit - Google Patents

Abstract

PURPOSE:To prevent heat efficiency from being deteriorated, and prevent water certainly from being infiltrated into a pit by containing a valve or the like set on an underground conduit line, in the pit, and by setting the pipe inserting section of the pit to be of multiple cut-off construction including a thermal insulation layer. CONSTITUTION:The controller of a valve or the like set on an underground conduit line 1 for permitting cool/warmed water to pass is contained in a pit 3, and the pipe inserting section of the pit 3 is set to be of triple cut-off construction. As this primary cut-off, a hole 17 close to the external wall of the pit 3 is filled up with mortar 20, and external sealing is applied to. After that, in the hole 17 close to the internal wall of the pit 3, a urethane resin layer 23, a mortar layer 25, and an epoxy resin layer 26 are multi-formed, and secondary cut-of is applied to. Besides, tertiary cut-off consisting of a thermal insulation sheet 24, an O-ring 32, a sleeve pipe 29, a resin layer 33, and the like is applied to. Then, by permitting the thermal insulation sheet 24 to follow the expansion and contraction of the conduit line 1 due to the passing water of cooling water or warmed water, heat efficiency is prevented from being deteriorated, and by multiple cut-off construction, water is certainly prevented from being infiltrated into the pit 3.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is an underground conduit for district heating and cooling that passes cold and hot water, and a control device such as a valve provided in the conduit is housed in a pit, and the pipe insertion part of the pit has a water-stop structure. This invention relates to a waterproofing device for a pipe insertion part of a pit.

0002

[Prior Art] Conventionally, a control device such as a valve is installed in the middle of an underground pipe that is laid underground and passes cold or warm water for air conditioning and heating, and the pipe itself expands and contracts as the temperature changes. A waterproofing device is known in which the control device is housed and protected in a pit, and the pipe insertion portion of the pit is waterproofed. The waterproofing device generally includes a steel pipe sleeve having a flange on the pit side in a pipe insertion hole opened at the pipe insertion part of the pit, and a mortar waterproof layer is formed between the steel pipe sleeve and the outer circumferential surface of the pipe line. It was something. Furthermore, in the case where the above-mentioned underground pipeline is a gas pipe, the applicant provides a sheath pipe on the outer periphery of the pipeline inside the pit at the pipe insertion part of the pit, and fills the sheath pipe with urethane resin. It is proposed that an O-ring is disposed between the inner circumferential surface of the sheath tube on the end side and the outer circumferential surface of the conduit.

0003

[Problems to be Solved by the Invention] By the way, the temperature of the cold water passed through the underground pipe is about 5°C, and the temperature of the warm water is about 80°C. It will expand and contract by about 10mm in the length direction, and if only the conventional waterproofing device described above is used, the waterproofing device will be damaged and the followability, waterproofness, thermal efficiency, etc. will be insufficient. There was a problem in that water entered the pit and deteriorated the functionality and workability of control devices such as valves. The present invention has been made to solve the above problems.

0004

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an underground conduit for district heating and cooling through which cold and hot water passes, and a control device such as a valve provided in the conduit is housed in a pit. , which waterproofs the pipe insertion part of the pit with a water-stop structure, in which the pipe insertion part has a primary water stopper that fills the hole near the outer wall of the pit with mortar to provide an external seal, and a water stopper that seals the hole near the inner wall of the pit. A secondary water stop is formed by filling and curing multiple urethane resin layers, mortar layers, and epoxy resin layers, and a heat insulating sheet is placed around the outer periphery of the pipe body exposed from the inner wall of the pit to prevent expansion and contraction of the pipe body. A heat insulating layer that cuts off the influence, an annular O-ring surrounding the heat insulating layer, a sheath pipe fixed to the inner wall surface of the pit so as to secretly press and press the O-ring against the outer periphery of the pipe body, and a sheath. It is characterized by providing a tertiary water stop means consisting of a filled and hardened resin layer between the inner surfaces of the pipe and O-ring and the inner wall surface of the pit.

[0005]

[Operations] With the above structure, the present invention performs the following operations. ■ Even if the pipe itself expands and contracts due to temperature changes as cold water or warm water passes through the pipe, the heat insulating sheet can follow the expansion and contraction, and thermal efficiency will not deteriorate. ■
Water attempting to enter the pit from outside the pit through the tube insertion portion is reliably blocked by the primary water stop, secondary water stop, and tertiary water stop, and does not enter the pit. Therefore, control devices such as valves housed in the pit are prevented from being submerged in water and having their functions, workability, etc. deteriorated. ■ The O-ring provides waterproofness and followability, and also facilitates maintenance of the waterproof structure. ■ The outer periphery of the tube is surrounded by a heat insulating sheet, which prevents rapid deterioration of the epoxy resin layer and O-ring.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described in detail with reference to the accompanying drawings. This embodiment is about waterproofing construction when water leakage occurs in the pipe insertion part of the pit of the existing pipe line, or when water leakage is to be prevented. In the figure, reference numeral 1 indicates a conduit laid underground, and this conduit 1 has five
It is used for cooling or heating by passing cold water at around 80°C or warm water at around 80°C, and the pipe itself contracts or expands due to the temperature change caused by the passage of cold water or warm water, causing the length to increase. It expands and contracts by about 10 mm in the direction. A valve 2 is provided in the middle of this conduit 1, and this valve 2 is housed in a pit 3 and protected. The pipe insertion portion 4 of the pit 3 is waterproofed.

The pit 3 is constructed by placing a lower pipe block 5 on a foundation hardened with foundation piles, grist stones, etc.
A pipe block 6 consisting of blocks, a pipe block 7,
Straight wall block 8, slanted wall block 9, adjustment pedestal block 1
0, stack the inner lid frame 11, inner lid block 12, etc. in order,
An epoxy resin-impregnated body is placed at each joint and bonded, and at the same time it is waterproofed and formed into a manhole shape. Then, the inner cover 13 with a cam lever is fitted to the inner cover frame 11 and the inner cover block 12, and the upper cover frame 15 is fixed by a plurality of upper cover frame fixing bolts 14, 14, . . . provided on the inner cover block 12.
is fixed to the upper lid frame 15, and the upper lid 16 is fitted onto the upper lid frame 15. Further, the valve 2 is placed on the lower tube block 5 via a valve holder, an adjustment piece, etc.

The tube block 6 is provided with a tube insertion hole 17 having a diameter slightly larger than the diameter of the tube 1 for passing the tubes 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 of the pit 3 of the steel pipe sleeve 18. Inner surface of steel pipe sleeve 18 and pipe line 1
There is an existing waterproof layer 20 such as a mortar layer between the outer peripheral surface of the
is provided at approximately the thickness of the block 6, and whether to perform waterproofing work if water is leaking from here into the pit 3, or whether to perform leakage prevention work in advance even if water is not leaking, and
Even in the case of new construction, almost the same waterproofing work is carried out.

Approximately half of the thickness of the existing waterproof layer 20 is removed from the inside of the pit 3, and a predetermined hydration-reactive urethane resin 23 is applied to the end surface between the outer periphery of the pipe line 1 and the inner surface of the steel pipe sleeve 18. Apply to thickness. The application of this hydroreactive urethane resin 23 may be omitted in the case of new installation work. The exposed outer peripheral surface of the pipe line 1 in the pit 3 is surrounded by a hard heat insulating sheet 24 such as glass wool, the outer end of which faces into the pipe insertion hole 17. Then, mortar 25 is filled between the outer periphery of the pipe line 1 including the end of the heat insulating sheet 24 and the inner surface of the steel pipe sleeve 18 to perform a primary water stop. Further, the outer circumference of the heat insulating sheet 24 and the steel pipe sleeve 1 are located at the inner end of the pipe insertion hole 17.
Epoxy mortar 26 is applied between the inner surface of the flange 19 of 8 and the inner surface of the tube block 6.

On the other hand, the pipe line 1 and flange 1 in the pit 3
A plurality of anchor bolts 27 are implanted in a circular shape at predetermined intervals in the pipe block 6 located on the outer periphery of the pipe block 9 , and the outer periphery of each anchor bolt 27 and flange 19 is impregnated with epoxy resin for the pipe block 6 . It is bonded and waterproofed by the body 28. The sheath tube 29, which is split into two, is attached to the anchor bolts 27, 27, . . . by being tightened with nuts 30, 30, . After installing the sheath tube 29, the sheath tube 2
The epoxy mortar 31 is filled in the grooves formed in the block 6 at the outer circumferential portion of the block 9 and the outer circumferential portion of the epoxy resin-impregnated body 28 facing the pipe surrounding block 6, thereby providing a secondary water stop. The sheath pipe 29 is in confidential contact with the outer periphery of the conduit 1 via an O-ring 32, and forms a predetermined space 33 with respect to the pit inner wall (flange 19). Resin injection port 34 at the bottom, air vent 3 at the top
5 are provided for each. Then, while pressurizing and injecting the epoxy resin 36 from the resin injection port 34, the air vent port 3
The epoxy resin 36 is pressurized and filled into the space 33 while removing air from the space 33 from the space 33. When the pressurized filling of the epoxy resin 36 is completed, the resin injection port 34 and the air vent port 35 are closed to perform a tertiary water stop and the waterproofing work is completed. In addition,
The degree of secrecy of the O-ring 32 is adjusted by tightening or loosening an O-ring tightening frame 32b inserted through a bolt 32a using a nut 32c.

[0011] In the pipe line 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 line 1 and used for cooling or heating. During this process, the tube itself contracts or expands due to temperature changes caused by the passage of cold or warm water, expanding and contracting by about 10 mm in the length direction and slightly in the circumferential direction.

In response to the contraction of the pipe line 1, especially the heat insulating sheet 24 follows the contraction of the pipe passage 4 of the pit 3.
Airtightness is maintained by the waterproof layer 20, the hydration reaction type urethane resin 23, the epoxy mortar 26, the epoxy resin 36, the O-ring 32, etc., and no gap is created in the tube insertion portion 4 through which water can pass. Therefore, even if water on the outside of the pit 3 tries to enter the pit through the tube insertion part 4, the O-ring 32, the heat insulating sheet 24, the waterproof layer 20, the mortar 25
, the epoxy mortar 26, the epoxy resin 36, etc., preventing it from entering the pit 3, and maintaining good thermal efficiency.

In the sheath pipe 29, the outer periphery of the anchor bolt 27 and flange 19 is bonded and waterproofed to the pipe block 6 with an epoxy resin impregnated member 28, and the outer periphery of the outer periphery of the epoxy resin impregnated member 28 is Waterproofing is achieved by filling the groove formed in the block 6 of the section with epoxy mortar 31, and the flange 19 on the inner surface of the pit 3 and the steel pipe sleeve 18 are in close contact with the outer periphery of the pipe line 1 via an O-ring 32. A space 33 is formed in a confidential state, and this space 33 is filled with epoxy resin 36 under pressure through a resin injection port 34 and an air vent port 35, so that water definitely does not enter from the tube insertion part 4. thwarted. This prevents the valve 2 housed in the pit 3 from being submerged in water, thereby preventing an accident in which its function, workability, etc. are deteriorated.

[0014]

Effects of the Invention As explained above, according to the waterproofing device for a pipe insertion portion of a pit according to the present invention, the following effects can be achieved. ■ Even if the pipe itself expands and contracts due to temperature changes as cold water or warm water passes through the pipe, the heat insulating sheet, in particular, exhibits the ability to follow the expansion and contraction, maintaining airtightness and reducing thermal efficiency. Never. ■ Water that attempts to enter the pit from outside the pit through the tube insertion part is reliably blocked by the primary water stop, secondary water stop, and tertiary water stop, and does not enter the pit. Therefore,
It is possible to prevent an accident in which a control device such as a valve housed in a pit is submerged in water and its function, workability, etc. are deteriorated. (2) By providing an O-ring, waterproofness and followability are exhibited, and the O-ring can be removed to easily maintain the waterproof structure. ■ Since the outer periphery of the tube is surrounded by a heat insulating sheet, the epoxy resin layer and O
Rapid deterioration of the ring can be prevented and the durability of the water-stopping structure can be increased.

[Brief explanation of drawings]

FIG. 1 is a side cross-sectional view of essential parts showing an embodiment of the present invention.

FIG. 2 is a side sectional view of the entire pit in which the present invention is implemented.

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

[Explanation of symbols]

1 Underground conduit 2 Valve 3 Pit 4 Tube insertion part 6 Pipe block 17 Tube insertion hole 18 Steel pipe sleeve 19 Flange 20 Mortar waterproof layer 23 Hydration reaction type urethane resin 24 Hard 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)

[Claims] Claim 1: An underground conduit for district heating and cooling that passes cold and hot water, in which a control device such as a valve installed in the conduit is accommodated in a pit, and the pipe insertion part of the pit is waterproofed to a water-tight structure, For the above tube insertion part, the hole near the outer wall of the pit is filled with mortar to provide an external seal, and the hole near the inner wall of the pit is filled with a urethane resin layer, a mortar layer, and an epoxy resin layer in multiple layers and hardened. In addition, a heat insulating layer that surrounds the outer periphery of the pipe exposed from the inner wall of the pit to prevent the expansion and contraction of the pipe, and a heat insulating layer surrounded by the heat insulating layer. An annular O-ring, a sheath tube that is fixed to the inner wall of the pit so that the O-ring is secretly pressed against the outer periphery of the tube, and a space between the inner surface of the sheath tube and O-ring and the inner wall of the pit is filled and hardened. A waterproofing device for a pipe insertion part of a pit, characterized in that it is provided with a tertiary water-stopping means made of a resin layer.