JPH0543357Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a repair device for an existing pipe joint.

Conventional technology and its problems In existing pipes such as gas pipes buried underground, the seal part of the pipe joint usually consists of a mortar-filled part on the outside of the joint and a fibrous filling part on the inside. It consists of As the inner fibrous filling portion of the seal portion ages, it dries and shrinks, reducing or eliminating its sealing function and requiring repair.

Conventionally, as a repair device for such pipe joints, a rubber packer part installed in a pipe construction machine that is towed inside an existing pipe is inflated under remote control, sealing the pipe joint part and removing the fibers inside the pipe joint part. A structure has been proposed in which a sealing agent is injected into the wet filling part to restore it to the wet state at the time of construction. However, conventional repair devices have the disadvantage that during the injection operation of the sealant, air pockets tend to cause local injection defects, resulting in a lack of reliability in repair.

The present invention was made with the aim of eliminating these conventional problems.

Means for Solving the Problems The present invention consists of a construction machine that is movable in the axial direction of the existing pipe, a pipe joint sealing part that is equipped with the construction machine and can be expanded and contracted in the radial direction of the pipe, and the same. In a repair device for an existing pipe joint that is equipped with a construction machine and is equipped with an inlet for injecting sealant into the pipe joint, there is a An erected string for forming an exhaust passage is installed, and the string is held between the packer part and the inner surface of the pipe when the pipe joint part is sealed by expanding the packer part, and is bitten by the outer surface of the packer part. The present invention relates to an apparatus for repairing an existing pipe joint, characterized in that the present invention is configured to form an exhaust passage along the string between the packer part and the inner surface of the pipe.

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

In Figures 1 to 4, reference numeral 1 indicates a construction machine installed inside the existing pipe a, and the construction machine 1 is supported at the center of the pipe by spring shoes 2, 2 provided at both the front and rear ends. The construction machine 1 is moved in the axial direction of the pipe by pushing a rubber hose 3 attached to the rear end of the construction machine 1. The construction machine 1 may be moved within the pipe by a rope pulling operation instead of the pushing operation using the rubber hose 3.

Rubber packer parts 4a and 4b are provided at the front and rear parts of the body part 1a of the construction machine 1 with an interval of 5,
Inside the packer parts 4a and 4b, there is a first air passage 6 formed in the body part 1a and a second air passage in the rubber hose 3.
The air passages 7 are connected to a pressurized air supply section (not shown) installed on the ground. Furthermore, a sealing agent injection port 8 is provided at the lower end of the body portion 1a so as to be opened at the above-mentioned interval, and the injection port 8 has the following characteristics:
A first liquid passage 9 and a rubber hose 3 formed in the body portion 1a
It is connected to a sealant supply section (not shown) installed on the ground through a second liquid passage 10 within the tank. As the sealant, ethylene glycol and other epoxy resin adhesives can be used as usual.

Further, cylindrical self-aligning metal fittings 11, 11 are fitted freely in the direction around the axis at both the front and rear ends of the body portion 1a, and an elastic material such as rubber is inserted between the top ends of the self-aligning metal fittings 11, 11. A string 12 made of aluminum is installed.

The self-aligning metal fitting 11 is, for example, cylindrical, has a weight 11a (see FIG. 4) at the bottom, and is constantly connected to the string 1.
Automatically align so that 2 is located at the top.

When repairing a joint part b of a pipe a (see Fig. 2) using the device of the present invention, the construction machine 1 is moved inside the pipe by a pushing operation with a rubber hose 3, as shown in Fig. It is aligned with part b. For this alignment, various known means such as a position detector (not shown) provided in the construction machine 1 and a television camera vehicle are applied.

After the alignment with the joint part b is completed, the packer parts 4a and 4b are expanded by supplying pressurized air, as shown in FIG. 2, and the joint part b is sealed at both front and rear ends. In this sealed state, an annular gap c based on the interval 5 is formed between the packer parts 4a and 4b, and the inner end surface of the fibrous filling part _b1 of the joint part b faces this annular gap c. In addition, as shown in FIG. 3, the string 12 is
4b and the inner surface of the tube, the string (ni) bites into the outer surface of the packer parts 4a, 4b, and an exhaust passage d is formed along the bited string 12. It plays the role of communicating the gap c with the outside air.

In the state shown in FIG. 2, the body 1a of the construction machine 1
When the sealant is injected from the injection port 8 which is opened downward at the lower end, the sealant is gradually injected and filled from the lower part upwards into the annular gap c and the surrounding fibrous filling part _b1 , and the air is The above exhaust passage 12
It is expelled to the outside through

Therefore, in the annular gap c and the fibrous filling part _b1 ,
Finally, the sealing agent is compacted and filled without generating any air pockets, and the sealing agent can be injected and filled into the fibrous filling portion _b1 with sufficient reliability over the entire circumference.

After the sealant injection and filling operation is completed, the packer portions 4a and 4b are contracted to prepare for the next operation. In this case, the sealant in the annular gap c remains in the pipe as a residue. This residue usually flows and solidifies in a thinly spread state, so there is no particular problem, but depending on the case, it may be post-treated using the construction machine 1 to spread it thinly.

Effects According to the repair device of the present invention, the sealant can be injected into the pipe joint while exhausting the air, so there is no risk of air pockets forming, and the reliability of pipe joint repair using the pipe construction machine can be improved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an embodiment of the present invention and one usage situation, when the packer part is contracted, Fig. 2 is a longitudinal cross-sectional view when the packer part is expanded, and Fig. 3 is A of Fig. 2. 4 is a cross-sectional view taken along line A. FIG. 4 is a cross-sectional view showing how the self-aligning metal fittings are attached. In the figure, 1 is the construction machine, 2 is the spring shoe, 3 is the rubber hose, 4a and 4b are the patch car parts,
5 is the interval, 6, 7 is the air passage, 8 is the injection port, 9,
10 is a liquid passage, 11 is a self-aligning metal fitting, and 12 is a string.

Claims (1)

[Scope of claim for utility model registration] A construction machine that can move within the existing pipe in the direction of the pipe axis,
An existing pipe joint part equipped with a pipe fitting sealing packer part that is provided on the construction machine and can be expanded and contracted in the radial direction of the pipe, and an injection port for injecting a sealant into the pipe joint part, which is provided on the construction machine. In this repair device, a string for forming an exhaust passage is installed between both ends of the construction machine on the outside of the patcher part, and when the pipe fitting part is sealed by expanding the patcher part, the string It is characterized by being configured to be held between the trouser portion and the inner surface of the tube and to bite into the outer surface of the trouser portion to form an exhaust passage along the string between the trouser portion and the inner surface of the tube. Repair equipment for existing pipe joints. A string for forming an exhaust passage is installed between both ends of the construction machine via self-aligning metal fittings that are fitted freely around the shaft at both ends of the construction machine in the axial direction of the pipe. A repair device according to claim 1 of the utility model registration claim.