JP2571978Y2 - Sealing plug - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing plug for sealing a lubricant injection port formed in a pipe for a propulsion method.

[0002]

2. Description of the Related Art A lubricant is injected from the inside of a pipe to the outside of the pipe in order to reduce friction between the pipe and a ground for the propulsion method which is laid under the ground and is buried under the ground. That is being done. For this reason, a lubrication inlet is formed in the propulsion method pipe through the pipe wall, and a sealing plug is usually attached to this. As a repairing method when water leaks at the mounting portion during the propulsion work with the plug attached to the inlet, it is common to apply resin, cement, or the like to the water leaking portion.

[0003]

In such a state, when the earth cover is deep and underground water pressure is applied, a water passage is formed before the applied resin or cement is hardened, so that a stoppage is caused. There is a problem that water is often not available.

The present invention solves such a problem.
Provided is a sealing plug that can reduce the water pressure applied to a resin or cement applied to a leaked portion and prevent a water passage from being formed before the applied resin or cement hardens. The purpose is to:

[0005]

In order to solve the above-mentioned problems, the present invention provides a plug for sealing an opening formed in a pipe wall of a pipe for a propulsion method. A hole, an O-ring provided on the inner surface in the circumferential direction of the through hole, and a water stop screw inserted into the through hole and screwed into the through hole from the inside of the pipe via a screw portion formed at a base end portion. A stopper is provided, and the water stopper is pressed against the O-ring to seal the through hole.

[0006]

According to the above construction, if water leaks between the injection port of the lubricant or the like of the propulsion method pipe and the sealing plug that seals the injection port during the propulsion work, resin or cement is injected into the water leakage portion. When the water stopcock screwed into the through hole of the plug body is removed and groundwater flows into the through hole of the plug body, the water pressure applied to the leaked part coated with resin or cement etc. decreases, Before the hardened resin or cement hardens, there is no longer a possibility that a water passage is formed and the water cannot be stopped. When the curing is completed in the water stopped state, a water stopcock is attached to the through hole to stop the whole water.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes an iron pipe of a propulsion method pipe, 2 denotes a mortar provided on the iron pipe 1, and an opening formed in the mortar 2 corresponding to a hole formed in a pipe wall of the iron pipe 1. A socket 4 having a screw portion 3 on an inner peripheral surface to which a nipple of a supply pipe for supplying lubricant to the outside is attached is attached, and a lubricant injection port 5 is formed inside the socket 4.

Reference numeral 6 denotes a lubricant injection port 5 mounted on the socket 4.
A plug having a frusto-conical shape whose tip is slightly smaller in diameter than the inner diameter of the socket 4 and whose base is slightly larger in diameter than the inner diameter of the socket 4. A screw portion 8 screwed to the screw portion 3 of the sket 4 is formed. When the plug body 7 is screwed into the screw portion 3 of the socket 4 from the tip end thereof, the plug body 7 is aligned with the socket 4 at a portion having the same diameter as the inner diameter of the screw portion 3 of thesket 4, and the lubricant inlet 5 is securely sealed.
The sealing plug 6 has a through hole 9 at the center of the plug body 7, and an O-ring 10 is provided on the inner periphery in the circumferential direction of the through hole 9.

Reference numeral 11 denotes a water stopcock which is inserted into the through hole 9 from the inside of the pipe, and a screw portion 13 screwed into a screw portion 12 formed at the base of the through hole 9 of the plug body 7 at the base end thereof. Is formed. When the water stopcock 11 is inserted into the through hole 9 and its screw portion 13 is screwed into the screw portion 12 of the through hole 9 and fixed, the water stopcock 11 is pressed against the O-ring 10 of the through hole 9. In this state, the through-hole 9 is sealed.

As shown in FIG. 1, during propulsion work with the sealing plug 6 attached to the socket 4, water leaks from between the threaded portion 8 of the plug body 7 and the threaded portion 3 of the socket 4. In this case, as shown in FIG. 2, a water-stopping material 14 such as resin or cement is applied to the leaked portion, and the water stopcock 11 is removed from the through hole 9. Then, the groundwater flows into the through hole 9 of the plug body 7 as shown by the arrow, and the threaded portions 3 and 8
Water pressure on In this state, water leakage from the screw portions 3 and 8 is stopped by the water stopping material 14 such as resin or cement. After the water-stopping material 14 has hardened, the water stopcock 11 is attached to the through hole 9,
Stop the whole water. Therefore, before the applied resin, cement, or the like hardens, a path through which water passes is formed in the water leak portion, and the water leak portion is reliably repaired.

[0011]

[Effects of the Invention] As described above, according to the present invention, since the sealing plug has a structure in which the through hole is provided in the plug body, if water leaks from the periphery of the plug body during propulsion work, By applying resin, cement, etc. to this leaked part and removing the water stopcock attached to the through hole, the groundwater flows into the through hole of the plug body, and the water pressure applied to the leak part around the plug body is reduced. As a result, the passage of water in this portion before the applied resin or cement hardens is eliminated. Since the curing is completed in this state, the water stop by the resin or cement is ensured. Thereafter, by installing a water stopcock in the through hole, the entire water stoppage is achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sealing plug according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a plug repair state by the sealing plug.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron pipe 2 Mortar 4 Socket 5 Lubricant inlet 6 Sealing plug 7 Plug main body 9 Through hole 10 O-ring 11 Water stopcock 14 Waterproof material such as resin and cement

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16L 55/00 F16L 55/10-55/11 E21D 9/06 301 E21D 9/06 311

Claims (1)

(57) [Scope of request for utility model registration] 1. A plug for sealing an opening formed in a pipe wall of a pipe for a propulsion method, wherein a through hole is provided at the center of the plug body so as to communicate with the inside and outside of the pipe. An O-ring is provided, and is further screwed into the through-hole from the inside of the tube via a screw portion formed at the base end portion, which is inserted into the through-hole, and is pressed against the O-ring to form the through-hole. A sealing plug provided with a water stopcock for sealing.