JPH077389Y2 - Protective pit for gas shutoff valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a waterproof structure of a manhole-shaped protective pit for protecting a gas shutoff valve provided in a gas pipe buried underground. is there.

[Conventional technology]

Since most of the gas conduits are buried under the road, the pipes, shut-off valves, etc. can be maintained safely against the influence of internal and external forces due to the load of vehicles traveling on the road surface, earthquakes, temperature changes, etc. We must secure a stable supply. In particular, the shutoff valve plays an important role such as shutting off the gas and adjusting the gas flow rate. In recent years, a shutoff valve with increased operability has been installed in the gas main and this valve is stored in the protective pit. The plumbing technique that is used is known.

In order to install a gas cutoff valve in the gas conduit and store this valve in the protective pit, compact the ground below the valve installation with a rammer etc., and locate the protective pit made of reinforced concrete on which the valve is stored. In addition, gas pipes are connected to both sides of the valve to seal the gas pipe insertion portion of the pit. A valve operating section provided above the valve is provided above the pit so that the lid is opened for operation.

[Problems to be solved by the device]

By the way, in the above-mentioned conventional protective pit, constituent members mainly made of reinforced concrete are sequentially stacked from the bottom, a metal inner lid and an upper lid are provided on the upper portion, and gas pipe insertion support portions extending to both sides from the valve are airtightly constructed. hand,
Airtightness is maintained at the beginning of construction. However, due to ground subsidence, strain due to expansion and contraction due to temperature changes of gas pipes, vertical subsidence of the protective pit due to vehicle load passing over the protective pit, horizontal lateral displacement, and effects of other underground construction, Water may leak from the outer circumference into the protective pit, and water may accumulate in the pit, causing rusting of the valve body and deterioration of valve operability. It has been found that a large amount of water leaks into the protective pit at the lower position of the protective pit and tends to accumulate.

The present invention has been made in consideration of the above circumstances, and even if there is water leakage in the protective pit, the valve is soaked in water to prevent rusting and deterioration of operability, etc. The purpose is to provide a protective pit for the valve.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a gas cutoff valve 2 in the middle of a gas pipe 1 buried in the ground, and an insertion portion of the gas pipe 1 connected to the gas cutoff valve 2. In the protective pit 3 which is provided with a sheath pipe 22 in which a resin layer 23 and an O-ring 24 are disposed in the sheath pipe 22 for waterproofing, the gas shut-off valve 2 is housed in the protective pit 3. Along the inner wall surface of the pit 3, a waterproof sheet 21 for preventing water and the like from entering from outside is airtightly stretched with the inner wall surface of the pit 3 at a predetermined distance, and the outer peripheral surface of the sheath pipe 22. Further, it is characterized in that it is airtightly stretched at a predetermined distance from the inner wall surface of the pit 3.

[Action]

According to the present invention having the above-mentioned configuration, even if the watertightness of the protective pit is impaired and the water tries to enter the pit from the outside, the water is prevented from entering the pit by the waterproof sheet and the water is prevented. There is no accumulation in the pit, and there is no rusting of the valve body or deterioration of operability. In addition, since the waterproof sheet is stretched airtightly with the inner wall surface of the pit and the outer peripheral surface of the sheath tube at a predetermined distance, after the waterproof sheet is stretched, the protective pit is damaged and water leaks. Even if it comes to do so, it is possible to prevent water from entering the protective pit without damaging the waterproof sheet, and also to prevent dew condensation on the inner surface of the waterproof sheet.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 is a diameter of 100 mm buried underground
A gas pipe called a main gas pipe of ~ 750 mm, which is a gas transport pipe supplied with a low or medium gas pressure, and a shutoff valve 2 is arranged in the middle of this gas pipe 1. 2 is housed in a protective pit 3 for protection.

The protective pit 3 is composed of a reinforced concrete bottom 4, a body block 5, a straight wall 6, a slab block 7, a taper block 8, an adjusting block 9, and an inner lid block 10 in order from bottom to top.
, The inner lid 11 made of a removable metal on the inner lid block 10, the resin adjustment stand 12 and the resin mortar 13 made of epoxy resin mortar, and the inner lid block 10 and the resin adjustment stand via the frame fixing bolts 14. 12, an upper lid frame 15 made of metal fixed to the resin mortar 13 and an upper lid 15 made of removable metal are provided on the upper lid frame 15.

The bottom plate 4 is supported by the ground stone 17 on the solidified foundation via the foundation pile 18, and supports the bottom surface of the shutoff valve 2 on the upper surface thereof. A fitting groove is formed on the upper surface of the outer circumference of the bottom plate 4.

The main body block 5 is formed so as to be placed on the outer peripheral surface of the bottom plate 4 and surrounds the periphery of the shutoff valve 2.
A fitting protrusion that fits in the fitting groove is formed, and an impregnating adhesive is applied and bonded. The body block 5 is provided with tube insertion holes 5a, 5a through which the gauze tube 1 is inserted. A bottom sheet 19 made of a rubber plate is stretched on the bottom plate 4,
A rubber plate 20 is laid on the bottom waterproof sheet 19, and the shutoff valve 2 is placed on the rubber plate 20. Bottom tarpaulin 19
Around the periphery of the main body block 5, the straight wall 6, and the slab block 7, a side waterproof sheet 21 is airtightly stretched by an adhesive with a predetermined distance from the inner peripheral surface. The lower end of is glued airtight.

In addition, a sheath pipe is provided on the outer peripheral portion of the gas pipe 1 inside the pipe insertion hole 5a.
22 is provided and the urethane resin layer 23 is filled therein, and an O-ring 24 is provided outside the urethane resin layer 23. Also on the outer peripheral surface of the sheath tube 22, the side waterproof sheet 21
Is airtightly stretched with an adhesive while maintaining a predetermined distance from the inner peripheral surface of the main body block 5.

By having such a configuration, the protective pit 3
Not only when installing a new gas pipe 1 in the ground,
The existing underground gas pipe 1 can also be equipped with the shut-off valve 2 and easily housed and protected in a hermetically sealed manner. Moreover, the part where water easily enters from the outside into the pit,
That is, the waterproof sheets 19, 21 are airtightly stretched around the main body block 5, the straight wall 6, the inner peripheral surface of the slab block 7, particularly around the gas pipe 18 inserted into the pipe insertion holes 5a, 5a. Since the urethane resin layer 23, the O-ring 24, etc. are provided, the intrusion of water from the outside is reliably prevented, and the shutoff valve 2 can be protected.

[Effect of device]

As described above, according to the protection pit of the gas cutoff valve of the present invention, water or the like can be prevented from entering from the outside along the inner wall surface of the pit 3 accommodating the gas cutoff valve 2 in the protection pit 3. A waterproof sheet 21 for prevention is airtightly stretched from the inner wall surface of the pit 3 with a predetermined distance, and the sheath pipe 22 is also provided.
The outer peripheral surface of the pit 3 is also airtightly stretched with a predetermined distance from the inner wall surface of the pit 3, preventing water from entering the protective pit 3, damage to the waterproof sheet 21, and condensation on the inner surface of the waterproof sheet 21. Thus, the shutoff valve 2 can be protected.

Further, the waterproof sheet 21 can be easily installed even in the existing protective pit 3, and even if water or the like enters inside the protective pit 3, it is blocked by the waterproof sheet 21 and enters the gas shutoff valve 2 position. There is nothing to do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional side view of the entire protective pit, FIG. 2 is a half sectional plan view of the same, FIG. 3 is an enlarged side sectional view of part A of FIG. 1, and FIG. It is an expanded sectional view of the figure B section. 1 ... Gas pipe, 2 ... Shut-off valve, 3 ... Protective pit, 4 ... Bottom plate, 5 ... Main body block, 6 ... Straight wall, 7
…… Slab block, 8 …… taper block, 9 …… adjustment block, 10 …… inner lid block, 11 …… inner lid, 12 ……
Resin adjustment stand, 13 …… Resin mortar, 14 …… Frame fixing bolt, 15 …… Top lid frame, 16 …… Top lid, 17 …… Grindstone, 18…
… Foundation pile, 19 …… Bottom tarpaulin, 20 …… Rubber plate, 21…
… Side waterproof sheet, 22 …… sheath tube, 23 …… urethane resin layer, 24 …… O-ring.

Claims (1)

[Scope of utility model registration request] 1. A gas cutoff valve (2) is provided in the middle of a gas pipe (1) buried in the ground, and the gas pipe (1) is connected to the gas cutoff valve (2). Sheath tube (2
2), the resin layer (23) and the O-ring (24) are disposed in the sheath pipe (22) to waterproof the pit (3). , Gas shutoff valves (2)
The pit (3) is provided with a waterproof sheet (21) that prevents water and the like from entering from the outside along the inner wall surface of the pit (3) that houses the
Airtightly stretched with a predetermined distance from the inner wall surface of
A protective pit for a gas cutoff valve, which is also provided on the outer peripheral surface of the sheath pipe (22) in an airtight manner at a predetermined distance from the inner wall surface of the pit (3).