JPH0221476B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is applicable when the wall thickness of a buried pipe such as a drainage pipe installed underground becomes thinner due to erosion or corrosion, or when a part of the buried pipe is damaged or cracked. The present invention relates to a repair method for buried pipes that can be adopted in

For example, when a fume pipe is used as a buried pipe for discharging wastewater for dyeing woolen fabrics, as shown in Fig. 9, the inner surface 1a of the buried pipe 1 that comes into contact with the air layer is exposed to toxic gases such as hydrogen sulfide generated from the wastewater W. In some cases, the wall thickness t ₁ of the pipe wall is less than half the original wall thickness t ₀ , and repair is required.

However, if the diameter of the above-mentioned type of buried pipe is small, such as a buried pipe for discharging dyed wastewater with a diameter of about 600 mm, it is impossible for workers to enter the pipe, so a particularly devised repair method must be adopted. There is a need.

The method of the present invention was developed by focusing on the fact that buried pipes generally have two or more manhole openings connected to them, and it is possible for workers to use these manhole openings to enter the buried pipe. The aim is to partially or completely repair the buried pipe without having to repair it.

That is, the method of the present invention involves inserting a tube group formed by connecting tube bodies into a buried pipe, and filling the space formed between the buried pipe and the tube group with a filler material, such as a concrete-based or synthetic resin-based material. The above-mentioned space is filled by loading the filler material, and a new flow path is constructed by the internal passage of the tube group, and the feeding of the individual tubes constituting the tube group is - The purpose is to use the manhole opening that communicates with the buried pipe to connect and guide the cable for inserting the pipe group into the buried pipe, and to perform these operations easily and quickly.

Embodiments of the method of the present invention will be described below with reference to the drawings. In this embodiment, as is clear from FIGS. 1 to 3, a buried pipe 1 installed under a road 2 is used.
The manhole openings 3 and 4 opened at two locations on the road surface are communicated by this, and below each manhole opening 3 and 4 there is a vertical shaft 3 with a larger diameter than these.
This is for the case where a and 4a are provided.

When carrying out the method of the present invention, one manhole opening 4 is used for feeding the pipe body 11, and the other manhole opening 3 is used for guiding the cable body 21.

That is, as shown in FIG. 1, pulleys 3 are installed at the top of the other manhole opening 3 and at the bottom of the shaft 3a.
1 and 32, one end of the cable (for example, wire) 21 wrapped around these pulleys 31 and 32 is connected to a winch 41 installed on the road surface, and the other end is passed through the buried pipe 1 and connected to one manhole opening. 4 to the bottom of the vertical shaft 4a. At this time, the cable body 21 is attached to the guide frame 61 installed in the appropriate position of the buried pipe 1.
It is inserted into the leading frame 51 which is slid inside the buried pipe 1.

Then, as shown by the imaginary line in the figure, the pipe body 11 is lowered into the shaft 4a through the manhole opening 4.
is connected to the leading frame 51 in a predetermined manner at the bottom of the shaft 4a as shown by the solid line in the figure, and the cable body 21 is further connected to this tube body 11. In the illustrated example, the circular frame 62 shown in FIG. 5 is applied to the end face of the socket 11a of the tube body 11 as shown in FIG. 62 with the cable body 21 connected to the center thereof. Circular frame 62 used at this time
As shown in FIG. 5, this has an integral outer ring 621 and an inner ring 622, and cutouts 621a and 622a are formed in the outer ring 621 and the inner ring 622, respectively. When using the circular frame 62 having such a configuration, when connecting the end of the cable 21 to the inner ring 622, the end of the cable 21 inserted through the tube 11 must cross the notches 621a, 622a. The engagement member, which is fixed in advance to the end of the cable body 21, is brought to the inner ring 622.
By being engaged with the outer surface of 22, the tube body 11
The cable body 21 can be easily and quickly connected to the rear end of the cable. Furthermore, if the circular frame 62 is provided with an annular protrusion 623 integrally with its outer ring 621 as shown in FIG. This has the advantage that not only can this be done easily, but also that the strength of the circular frame 62 is increased. In addition, lead frame 5
A worker enters the shaft 4a and performs the work of connecting the pipe body 11 to the pipe body 1, fixing the pipe body 11 and the circular frame 62, and connecting the cable body 21 to the circular frame 62. The shaft 4a has a diameter of about 900 mm that allows people to enter and exit even if the buried pipe 1 is of a small diameter of only about 600 mm, so it is not possible to carry out the above work inside the shaft 4a. It's not that difficult.

After completing the above work, by starting the winch 41, the rope body 21 is moved as shown by arrow A in FIG.
is pulled, and the pipe body 11 connected to the leading frame 51 is inserted into the buried pipe 1. Furthermore, a new tube body 11 is suspended from the manhole opening 4 and connected to the tube body 11 connected to the leading frame 51 to form a tube group 110. In this case, the circular frame 6
2 is removed from the tube body 11 connected to the leading frame 51, and then fixed to the newly fed tube body 11 in the state shown in FIG. 6, that is, on the rear end surface of the tube group 110 in the insertion direction. . Moreover, the inner ring 622 of this circular frame 62 is provided with a cable body 21 inserted into the tube body group 110.
The ends of the two are connected in the same manner as described above. Moreover, the pipe bodies 11 and 11 are connected to one pipe body 1.
The insertion port 11 of the other tube body 11 is inserted into the socket 11a of the first tube body 11.
In this case, as shown in FIG. 7, if the socket 11a is covered with a sealing packing 81 made of neoprene or the like, the connection part will be sealed liquid-tight, and furthermore, the socket 11a and If the space between the insertion port 11b and the curable or non-curable sealing material 91 is filled, the liquid-tight sealing property will be further improved. Furthermore, if the receiving port 11a is sanded at a suitable location, the bonding strength of the sealing material 91 will be increased. Note that if a non-hardening bond or the like is used as the sealing material 91, even if the pipe bodies 11, 11 are bent at the connecting portion, the sealing performance will not deteriorate due to peeling of the sealing material 91, so that the buried pipe will not be damaged. There is an advantage that even if there is a meandering portion, the liquid-tight sealing performance does not deteriorate at the connection portion of the tube body 11 inserted into the meandering portion.

Next, from the state shown in FIG. 2, start the winch 41 and pull the cable 21 in the direction of arrow A.
1 and the tube body group 110 are inserted into the buried pipe 1 by a predetermined distance. In this case, since the leading frame 51 and the two tube bodies 11 are pushed from behind by the circular frame 62, there is an advantage that no force in the detachment direction is applied to the connecting portion between the tube bodies 11. After that, a new pipe body 11 is lowered from the manhole mouth 4 to the shaft 4a, and this pipe body 11 is connected to the pipe body inserted into the buried pipe 1 to form a pipe body group 110, and then the cable body 2
1 and inserting the tube group 110 into the buried pipe 1, as shown in FIG.
A tube group 110 having a length suitable for the repaired location is inserted into the repaired location. When repeating the above operations, it is naturally necessary to replace the circular frame 62 as well.

After that, as shown in Fig. 4, the buried pipe 1 and the pipe body group 1 are
A filler 200 is loaded into the space between the tube group 110 and the tube body 10 to integrate the two, thereby making the internal passage 111 of the tube body group 110 a new flow path. After completing this work, the pulleys 31, 32, winch 41, circular frame 62, guide frame 61, leading frame 51 and cable body 2 shown in FIG.
Eliminate 1. Note that the filler can be a fluidized unhardened concrete-based filler or an unhardened synthetic resin-based filler, and if the buried pipe 1 is a humid pipe, an unhardened concrete-based filler can be used. is desired. In addition, when repairing the entire length of the buried pipe 1 between the two shafts 3a and 4a, after inserting the tube group 110 into the buried pipe 1 according to the above procedure until the leading frame 51 hits the guide frame 61. , leading frame 5
1 and the guide frame 61 may be removed, a tube body may be inserted into the buried pipe 1 from the side of the shaft 3a, and this tube body may be connected to the tube body group 110. In this case, when a part of the pipe connected to the pipe group 110 protrudes from the buried pipe 1 into the shaft 4a, it is preferable to cut that part.

In the above, a reinforced plastic tube such as FRP can be preferably used for the tube body 11, but it may be made of other materials. Further, as shown in FIG. 8, a plurality of self-sliding protrusions 11c are integrally provided at appropriate locations on the outer circumferential surface of the tubular body 11, and these protrusions 11c are explained in FIGS. 1 to 3. Choroid body 2
If the cable body 11 is made to slide against the bottom or side surface of the buried pipe 1 when it is pulled, the cable body will be more stable than when the pipe body 11 without the protrusion 11c is pulled into the buried pipe 1. This has the advantage that the pulling force of 21 is small and the work can be carried out smoothly.

A suitable material for the tube 11 is a slippery material such as ultra-high molecular weight polyethylene. In order to obtain the same effect, a wheel such as a carrier roller may be attached to the tube body 11 instead of the projection C.

As is clear from the above description, according to the method of the present invention, it is possible to target not only buried pipes with a diameter large enough for a worker to enter, but also buried pipes with a small diameter that a worker cannot enter. Even if there is a problem, the repair can be carried out easily. In particular, according to the method of the present invention, when the tube group is inserted into the buried pipe by pulling the cable, the tube group is pushed by the circular frame, so that the tube group can be inserted into the buried pipe. In addition to being less likely to cause problems if the connecting parts of the individual tube bodies that form are pulled apart, the notches formed in the inner and outer rings of the circular frame are used to connect the ends of the cable to the circular frame. Since it is possible to connect the circular frame to the inner ring of the rope, it is possible to connect the circular frame and the cable body easily and quickly even in narrow shafts, which has the effect of improving repair work efficiency. be. Note that the method of the present invention can be applied not only when the buried pipe is eroded or corroded, but also when a part of the pipe is damaged or cracked.

[Brief explanation of drawings]

Figures 1 to 3 are cross-sectional views for explaining the working procedure of the embodiment of the method of the present invention, Figure 4 is an enlarged cross-sectional view showing the case where the repair is completed, Figure 5 is a front view of the circular frame, and Figure 5 is a front view of the circular frame. Fig. 6 is a partial cross-sectional view showing a case where a circular frame is fixed to a pipe body, Fig. 7 is a cross-sectional view showing a connecting part of the pipe body, and Fig. 8 is a perspective view showing an example of the pipe body.
FIG. 9 is a sectional view showing an example of a buried pipe to be repaired. 1... Buried pipe, 3, 4... Manhole opening, 11
... tube body, 21 ... cord body, 110 ... tube body group, 2
00...Filler, 62...Circular frame, 621...Outer ring, 622...Inner ring, 621a...Outer ring notch,
622a...Inner ring notch.

Claims (1)

[Scope of Claims] 1. Hanging down a pipe from one of two manhole mouths communicated by a buried pipe, and inserting the suspended pipe into the buried pipe. The cables guided through the other manhole opening and the above-mentioned buried pipe are pulled to form a group of pipe bodies, and the above-mentioned pipe group is inserted into the buried pipe. In a buried pipe repair method in which filler is loaded into the space between a group of tube bodies inserted into a buried pipe, when the group of tube bodies is pulled by a cord and inserted into the buried pipe, A circular frame integrally having an inner ring and an outer ring with cutouts formed in the inner ring and outer ring is fixed to the rear end face in the insertion direction, and the above-mentioned cable body is inserted through the tube group. A method for repairing a buried pipe, comprising: connecting the end portion to the inner ring of the circular frame.