JPS6059033B2 - Conduit lining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a flowable sealant to be applied to a large-diameter pipe by running an object inserted into a conduit into which one or more small-diameter pipes are branched from a proper location of a large-diameter pipe. The present invention relates to a method of lining the inner surface of all conduits including branched small-diameter pipes in the form of a cylindrical membrane.

Conventionally, the method of lining a single pipe involves inserting a fluid sealant 4 between a pair of running objects (pigs) 3 and 3 in the front and back, as shown in Fig. 7A and 7B, and lining them from behind. There are known methods in which a moving object 6 is caused to travel within the conduit P_ by the fluid pressure F or a traction wire W, or the entire conduit P_ is filled with a fluid sealant 5 in advance and a traveling object 6 is caused to travel within the pipe. .

However, when this method is applied to the lining of a conduit where a small diameter pipe is j-branched into a large diameter pipe, the following problems arise. The pipes are lined separately, so cutting and separating the branch parts,
In particular, in the case of underground pipes, soil excavation work and restoration work require a great deal of effort.

The problem is that the small diameter pipe P_
When lining from the , side, the diameter of the small-diameter running object 7 does not match the large-diameter pipe P_, so when it moves to the large-diameter pipe P_, the running stops even if the running fluid pressure is applied to the large-diameter pipe P2 side. If the pipe is lined from the large diameter pipe P2 side, the sealant 8 will enter the branch of the small diameter pipe P1 and cause blockage.

Therefore, when there are a large number of branched small-diameter pipes, a work method with extremely poor workability is forced as described above. The conduit lining method according to the present invention was developed in view of this problem, and involves running a small-diameter traveling object corresponding to the small-diameter pipe in the small-diameter pipe until it reaches the inside of the large-diameter pipe, thereby coating the inner surface of the pipe. a step of lining the large-diameter pipe; a step of lining the inner surface of the large-diameter pipe by running a large-diameter traveling object corresponding to the large-diameter pipe in a state that also serves to discharge the introduced small-diameter traveling object; and a step of lining the inner surface of the large-diameter pipe; It consists of a process of pushing back the excess sealant that has entered the branch part of the small diameter pipe during the process to the large diameter pipe, and a process of transferring this pushed-back excess sealant into the large diameter pipe, and it is possible to separate a single small diameter pipe. In the case of a conduit portion having a range of 1 to 3, the above steps are performed in the order described above.

In other words, not only can small diameter pipes and large diameter pipes be lined as expected, but especially small diameter moving objects that have entered the large diameter pipe at the end of the small diameter pipe lining process can be simultaneously ejected during the next large diameter pipe lining. In addition, the excess sealant that seeped into the branch of the small diameter pipe during this large diameter pipe lining process is removed from the large diameter pipe in the subsequent process. The excess sealant is pushed back to the side to eliminate the blockage at the small-diameter pipe branch, and in the subsequent process, the excess sealant is transferred into the large-diameter pipe and used for lining the large-diameter pipe, or is discharged to the outside. In the end, since the remaining condition inside the pipe is eliminated, it is necessary to cut the branch part as in the conventional method. It is possible to greatly improve work efficiency by omitting extensive and time-consuming work such as soil excavation work in the case of underground pipes and restoration work. Depending on how the amount of sealant is set, it is possible to use excess sealant effectively in the lining and eliminate waste.
This effect is particularly effective when there are many branched small-diameter pipes.

The embodiment of the method of the present invention will be explained in the basic order of steps shown in FIGS. 1 to 4. Small diameter pipe P1 in one conduit P
A fluid sealing agent S1 and a pair of small-diameter running objects 1, 1 sandwiching it from the front and back are inserted into the inside, and they are placed inside the small-diameter pipe P1 and then into the large-diameter pipe P2 while applying fluid pressure for running. The inner surface of the small diameter pipe P1 is lined with the sealant S1 in the form of a cylindrical film by running the pipe until it reaches the point where it reaches the end (Fig. 1).
.

2 In the large diameter pipe P2 of the conduit P, a fluid sealing agent S2 is placed.
and a pair of large-diameter running objects 2, 2 sandwiching it from the front and back, and by running them inside the large-diameter pipe P2 under application of running fluid pressure, a large-diameter pipe can be formed in the small-diameter pipe lining step 1. A pair of small-diameter running objects 1, 1 that have moved into the pipe P2
Then, the inner surface of the large-diameter pipe P2 is lined with the sealant S2 in the form of a cylindrical film while discharging the excess sealant S1'' (second
figure).

In this step, it is desirable to close the open end of the small diameter pipe P1.

The small-diameter and large-diameter traveling objects 1 and 2 in steps 1 and 2 have radii obtained by subtracting the thickness of the lining tube membrane from the inner radius of the small-diameter and large-diameter pipes Pl and P2, respectively.

3. Inside the small diameter pipe P1, a small diameter traveling object 1'' having the same diameter as 1 is moved into the large diameter pipe P2 under fluid pressure, and in the large diameter pipe lining step 2, the small diameter traveling object 1'' is moved into the large diameter pipe P2, and in the large diameter pipe lining step 2, the small diameter traveling object 1'' having the same diameter as 1 is moved into the large diameter pipe P2. The excess sealant S2'' that had entered the pipe is pushed back toward the large diameter pipe P2 (Fig. 3).

4. The large-diameter running object 2'' is run under fluid pressure inside the large-diameter pipe P2, and the pushed-back excess sealant transferred into the large-diameter pipe P2 and the small-diameter running object 1 in the surplus sealant push-back step of 3 are removed. '' is transferred through the large-diameter pipe P2 (Fig. 4).

Also in this step, it is desirable to close the open end of the small diameter pipe P1.

The large-diameter traveling object 2'' in step 4 has a smaller diameter (at least during its travel) than the large-diameter traveling object 2 in step 2, in order to avoid the lining sealant from entering the small-diameter pipe as much as possible. It is desirable to keep it as

In addition, by doing so, especially in step 4, the pushed-back excess sealant S2'' can be consumed for lining the large diameter pipe P2 on the lower side of the traveling object. Alternatively, this may be done by adjusting the running back pressure. To enumerate useful modifications of the above basic process, (a) In steps 1 and 2, instead of using a pair of running objects 1, 1, 2, and 2, sealants Sl and S2'' are applied inside the pipe, respectively. After the entire area is filled, lining may be performed by running one running object 1, 2. (B) In the step 2, a pair of running objects 2, 2 in front and back
Alternatively, the traveling of the single traveling object 2 referred to in (a) may be carried out by towing as in FIG. 7.

(c) The pushing back of the excess sealant ■'' in step 3 and the transfer of the pushed-back excess sealant S2'' in step 4 can be carried out simply by fluid pressure feeding without using the running objects 1'' and 2''. You can also do it with

The above basic process was for a range of conduit P having a single small diameter pipe P1.
Here are a few practical construction methods for the conduit P range in which there are a large number of pipes.

In order to make the explanation easier to understand, on the drawings,
The small diameter pipe lining step 1 is represented by 8, the large diameter pipe lining step 2 is represented by 8, the surplus sealant pushing back step 3 is represented by C, and the pushing back surplus sealant transfer step 4 is represented by O.

Also, [1], [■], [■] are attached to the part surrounded by the broken line.
Symbols such as , etc. indicate the roughly divided time order.

Regarding the relationship between 4 and 8, there are two main types: A and A in Figure 5.

In FIG. 5A, 8 is performed on each of the plurality of small diameter pipes P1, and then 8 is performed on the large diameter pipe P2 all at once.

8 for the small-diameter pipe P1 group may be performed simultaneously, in parallel with a time difference, or in an order in which one is completed and then moved to the next. The opening in Figure 5 is circled with [1], which states that 6 is performed on one small diameter pipe P1, and then 8 is performed on the large diameter pipe P2 in the range that includes the small diameter pipe P1.
The combinations 8→8] are performed sequentially as [■] and [■].

Regarding the relationship between 6 and O, there are two main types: A and Q in Figure 6.

In FIG. 6A, after C is performed on each of the plurality of small diameter pipes P1, O is performed on the large diameter pipes P2 all at once.

O for the small diameter pipe P1 group may be performed simultaneously, in parallel with a time difference, or in any order such as finishing one and moving on to the next. The opening in Figure 6 is circled with [1] that indicates that O is performed on one small-diameter pipe P1, and then 0 is performed on the large-diameter pipe P2 in the range that includes the small-diameter pipe P1.
The combinations of C→0] are sequentially performed as [old, ■].

Now, the relationship between 8 and O is as follows: Figure 5 E Figure 6 Figure 5 B → Figure 6 mouth Figure 5 mouth → Figure 6 A Figure 5 mouth → Figure 6 mouth There are four combinations, and any one can be selected arbitrarily, but the first and fourth combinations are more practical.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the conduit lining method according to the present invention, and FIGS. 1 to 4 are schematic sectional views sequentially showing basic construction procedures. Figure 5 A and Figure 6 A and Figure 6 are model diagrams of practical construction procedures. Figure 7 (A) is a schematic cross-sectional view showing a general lining method for a single pipe, and Figure 8 (A) is a schematic cross-sectional view showing the general lining method for a single pipe. It is a schematic cross-sectional view pointing out.P...
・Conduit, P1...Small diameter pipe, P2...Large diameter pipe, ・S2''...Excess sealant, 1,1''...
...Small diameter running object, 2,2''...Large diameter running object.

Claims (1)

[Scope of Claims] 1. The inner surface of the conduit P is lined with a fluid sealant in the form of a cylindrical film by running an object inserted into the conduit P into which the small diameter pipe P_1 is branched from the appropriate location of the large diameter pipe P_2. The method includes moving a small-diameter traveling object 1 corresponding to the small-diameter pipe P_1 into the small-diameter pipe P_2 until it reaches and moves into the large-diameter pipe P_2.
A process of running inside the large diameter pipe P_1 and lining its inner surface, and running the large diameter running object 2 corresponding to the large diameter pipe P_2 inside the large diameter pipe P_2 while also discharging the introduced small diameter running object 1. The process of lining the inner surface of the large-diameter pipe P_1 and the process of lining the large-diameter pipe P_1 remove excess sealant S_2' that has penetrated into the branch part of the small-diameter pipe P_1.
The process of pushing back to the side and this pushing back excess sealant S
A conduit consisting of a combination of steps of transferring __2' in a large diameter pipe P_2, and in the case of a conduit P portion having a single small diameter pipe P_1, each of the above steps is performed in the order described above. Lining method. 2. The conduit lining method according to claim 1, wherein the excess sealant is pushed back by running a small-diameter traveling object 1' inside the small-diameter pipe P_1. 3. The method according to claim 1 or 2, wherein the pushed-back excess sealant S_2' is transferred by running a large-diameter traveling object 2' inside the large-diameter pipe P_2. Conduit lining method. 4. A patent claim in which the pushing-back excess sealant S_2' is transferred by running the large-diameter traveling object 2' in a state with a much smaller diameter than the large-diameter traveling object 2 in the large-diameter pipe lining process. The conduit lining method according to item 3.