JPS60155080A - Method of repairing underground buried pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing underground pipes.

Buried underground pipes such as sewage pipes, after many years have passed since they were buried,
Local subsidence or uplift of the ground leads to meandering of the pipe. As a result, gaps are created at the joints of the pipes, through which water flows out of the pipes.

In extreme cases, the joints of the pipes may separate, creating a level difference there and obstructing the flow of water. Therefore, in such cases, it is necessary to repair the underground pipe.

In such cases, conventionally the existing pipes buried underground were dug up and replaced with new pipes.

To perform this replacement, the existing pipes had to be dug up over a wide area, and a large amount of earth and sand had to be dug up or backfilled, making it a large-scale construction project.

Not only that, but since the sewer pipes are buried under roads with heavy traffic, digging up a large area of earth and sand would cause traffic congestion. Therefore, there was a need to repair underground pipes more easily.

The inventor focused on this need and searched for a simple repair method. As a result, the inventor did not replace the existing pipe buried underground, but carried a new pipe with a small diameter into the existing pipe, connected the new pipe within the existing pipe, and passed fluid through the new pipe. I came up with an idea to repair it. In this way, the new pipe will have a smaller diameter than the existing pipe, but
It was found that there would be no problem with the flow of the fluid, as the new pipes only need to be thin, and recent synthetic resin pipes allow fluid to flow easily. This invention was completed based on such ideas and knowledge.

This invention involves excavating the ground to expose a part of the existing pipe buried underground, drilling a hole in the exposed part of the existing pipe, and inserting a new pipe with an outer diameter smaller than the inner diameter of the existing pipe into the existing pipe through the hole. The new pipe is brought in, horizontally extending supports are attached to the lower part of the existing pipe at multiple intervals, the new pipe is moved on the supports and placed in the designated position, the new pipe is connected, and the new pipe is inserted into the existing pipe. The present invention relates to a method for repairing underground underground pipes, which is characterized by fixing the underground pipes to the ground, connecting the new pipes to existing branch pipes, and backfilling the existing pipes.

The method of this invention will be explained as follows based on the drawings. FIG. 1 is a partially cut away perspective view showing the steps involved in the method of the invention. FIG. 2 is a cross-sectional view showing another step of the method of the invention.

FIG. 3 is a longitudinal sectional view showing yet another step of the method of the invention. Figure 3 is an enlarged cross-sectional view taken along the line II--IV, partially cut away in Figure 3. FIG. 5 is a sectional view taken along the line ■-v in FIG. 1 to 7 are cross-sectional views of an existing pipe and a new pipe in the method of this invention. FIG. 70 is a partially cutaway perspective view showing yet another step of the method of the invention.

Figures 1/-1j are cross-sectional views of a tube illustrating further steps of the method of the invention.

In Figure 1, / is the ground, 2 is the existing pipe,
The existing pipes have gaps 3 or steps at the joints, which can cause water leaks. In such a state, the ground is dug to expose a part of the existing pipe 2, and a hole j is made in the exposed part of the existing pipe 2. A new pipe 2 having an outer diameter smaller than the inner diameter of the existing pipe 2 is carried into the existing pipe 2 through the hole j. Also,
Inside the existing pipe 2, a number of horizontally extending supports 2 are placed at intervals at the bottom, and rails are placed on top of the supports 2! /
Place the rail,! ? /A trolley on top! ? 2 and carried the new pipe g into the existing pipe 2 onto the trolley I? 2 and place it in the designated position. After that, the new pipes are lowered from the cart 12 and the new pipes 2 are connected to each other.

The new tube has one end left in the same shape as the tube and has an insertion part g/, and the other end is enlarged and has a socket 1.2 that allows the insertion part g/ to be inserted and fixed as is. and
The structure is such that they can be connected one after another. A sealing rubber ring z3 is attached to the outer periphery of the insertion part g/, so that when it is inserted into another new pipe socket 2, it can be connected airtightly. The new pipe g is integrally molded from synthetic resin or resin concrete. Resin concrete is a hardening synthetic resin containing gravel and reinforcing material such as glass fiber.

FIG. 1 shows the implementation of the method of the invention over a fairly long period of time. Since it will last for a long time, the area around hole j is reinforced with concrete, and an iron plate 7.2 is placed around hole j to make it stronger. Moreover, the opening in the ground of hole j can be closed by placing a lid on it.

FIGS. 2A and 2B show a state in which the new pipe j in FIG. 1 is put into the existing pipe, placed on the trolley F, and moved to a predetermined position. The support member 2 is configured such that arms 22 are telescopically inserted into both ends of a tube 2/ having a rectangular cross section, and fixed with screws 23. The center part of the support material 2 is
9! Supported by A rail g/ is fixed near both ends of the support member 2, and the rail! /A trolley on top! - is placed.

A new pipe j is placed on a trolley ♂2, and the new pipe j is carried inside the existing pipe 2 to a predetermined position.

Note that /3 is a lid, which is used to close the hole on the ground/top.

The new pipes 2 that have been carried to a predetermined position are unloaded from the truck and connected to each other within the existing pipes 2, and FIG. 3 shows these steps. For example, in order to connect the new pipe g3 and the pipe, a fixture made of shaped steel 1. is attached to the lower end of the new pipe 1j. s, and a similar shaped steel fixture Δg is secured to the lower end of the new pipe g.
, and then pull the wire rope Z2 with a tensioner tz to bring the new pipes closer to each other and insert the insertion part into the socket to connect them.

FIG. 7 shows the wire rope L! by locking the fixtures 16 and It to the new pipes z3 and ly, respectively. , 2 shows the tensile state in more detail. At the part where the new pipe 2 is connected, a small gap Z is left on the inner side, so the ends of the fixtures z and 5 are locked in this gap to fix the fixture 16. Also, after completing the connection, please insert 3 and t'y into the pipe.
A gap z2 is left between t and t to enable locking of the fixture during subsequent connection. In addition, wire rope 2 shall be stretched, one on each side.

FIG. 5 shows the relationship between the new pipe 1j and the fixture j in FIG. 7. The fixtures g, 5 are made of angle steel, T-beam steel, or channel steel, and have a length approximately equal to the inner diameter of the new pipe z3. Therefore, the fixing tool j can be locked to the new pipe at the lower part of 3, but it can be removed at the center, and this is to be removed after the new pipes are connected.

Fixture 2g is similar to fixtures g and 5, but its length is longer. That is, there is a g in the fixture,
This is because it is fixed to the socket of the new pipe 1y. Further, since the new pipe with a separate socket is often made thin, it is desirable to use a material softer than the shaped steel, such as wood, as the fixture gg. When using a shaped steel as the fixture 11, it is desirable to insert a cushioning material such as cloth or cardboard between the fixture 11 and the new pipe 2da.

Since the existing pipe 2 is meandering or has a step difference, the connected new pipe Δ is located in various directions within the existing pipe 2. Figures G to 2 show how the new pipe is fixed in the existing pipe 2 in such a lopsided state. The first figure shows a case where the new pipe z is located to the upper left of the existing pipe 2. A sleeper or wedge 2j is interposed between the new pipe 2 and the support material 2 to support the new pipe g, and a spacer 2g is inserted above to prevent the new pipe 2 from moving.

In FIG. 2, the new pipe g, which is offset to the upper right, is supported by sleepers or wedges 2j, and a screw-type jack 2g is inserted into the large gap at the lower left to support it. Further, the upper and other spaces are filled with filler such as mortar or resin to prevent the new pipe 2 from moving.

FIG. 2 shows a state in which the length of the support member 2 is reduced because the new pipe z is offset downward. A sleeper or wedge 2.5 is placed on top of the support material 2 to support the new pipe, and a screw type jack 2g is inserted into the large side gap to support it. Further, a wedge 2j is inserted above the new pipe together with a spacer 2g to prevent the new pipe g from moving.

The second figure shows a case where the support member 2 has to be removed because the new pipe 2 is located too far below the existing pipe 2. A sleeper or wedge 2j is placed below the new pipe, and a rib 7g and a holding plate 2 are placed above it to prevent it from moving into the new pipe.

In this way, after fixing the new pipe inside the existing pipe, the existing branch pipe connects to the new pipe in order to flow fluid into the new pipe. ,ru. 7th
In the θ diagram, a hole is made in the wall of the new pipe Z using a hole router, and the existing branch pipe Z2 is connected to it by the new core pipe 3. As a result, fluid from the branch pipe 2 can flow into the new pipe. After being connected to the branch pipe in this way, the connection part is backfilled with earth and sand, asphalt, or concrete Z. The hole will also be backfilled in the same way.

Figure 1 shows a mode in which after connecting a new pipe within the existing pipe 2, the space between the two pipes is filled with air mortar. An air mortar inlet l/ is provided in the wall of the new pipe g, as shown in Fig. 1, and a mortar transport pipe j is connected to this inlet as shown in Fig. 1. Air mortar is sent from j to fill the space between both pipes, and the new pipe 2 is fixed within the existing pipe 2. At this time, in order to facilitate the filling of air mortar,
K may be directly inserted into the gap between the two pipes, and a small hole may be made in the side wall of the pipe g to extract air from the pipe g. Note that 10θ is a manhole, 10/ is a manhole cover, and 70.2 is a partition made of sandbag force.

FIG. 72 is an enlarged cross-sectional view taken along the line ■--■ in Figure 1.

In Fig. 1.2, a screw type jack Z2 is attached above the new pipe 2, and this is to prevent the new pipe Z from floating up. That is, when filled with air mortar, the new pipe g floats up and is likely to change its position, so the jacker 2 is attached above the new pipe 2 to prevent this. The jack Z2 may be fixed onto the surface of the existing pipe 2 with an adhesive or the like.

FIG. 73 is an enlarged cross-sectional view of '@//■-) in the figure. In Fig. 73, in order to prevent the new pipe 2 from lifting up,
Spacer 2 above the new tube g! ? is attached. The spacer 2g is tied onto the new pipe Z with a wire or string Z, and is fixed so as not to move when air mortar is injected.

Figure 1 shows a state in which a branch pipe is connected to a new pipe.

Attach an elbow /// to the end of the existing branch pipe 2, connect the new core pipe 3 to the end, attach the new core pipe 3 perpendicularly to the wall of the new pipe 2, and install the saddle //, 2 can be fixed to the new pipe, and the branch pipe 59-7 and the new pipe 2 can be connected. Thereafter, the saddle //2 is surrounded with resin mortar /15/, and then the area around the branch pipes 2 and 3 is backfilled with soil.

Also, 'I! ', lSt diagram shows that saddle //, 2 is attached to the end of new core pipe 3, saddle //2 is bolted to new pipe 2, and branch pipe 3 is connected to the new pipe. It shows good things. Fill the area around the saddle /7.2 with air mortar, attach a plastic, metal or slate plate //3 to the surface of the existing pipe 2, and cover the existing pipe 2 with putty or mortar. You can also glue it to the surface and backfill with soil.

Further, the connection between the branch pipe and the new pipe may be as shown in FIG. 1j. That is, the end of the new core pipe 3 is projected into the inside of the new pipe g, the tip is glued from the inner surface, the outside is filled with air mortar, and the surface of the existing pipe is covered with a metal or plastic plate. 3 and cover with resin mortar //l
The branch pipe 3 may be connected to the new pipe g by abutting and hardening.

Instead, the tip of the new core pipe 3 is protruded into the inside of the new pipe g, the tip is fixed with putty //2, and a weir plate //,! is placed between the new pipe and the existing pipe 2! ? The branch pipe may be connected to the new pipe by surrounding it with resin mortar and filling the inside with resin mortar.

To make a hole in an existing pipe, for example, any ratio of 7 to jO-joom is sufficient, so not much labor is required to dig the soil or make the hole.

According to the method of this invention, it is sufficient to simply dig the ground to expose a part of the buried existing pipe, so the area to be dug is small, and the amount of soil dug up is also small, making it easy to dig up. Therefore, the amount of accumulated earth and sand is small, so there is less obstruction to traffic. In addition, a hole is made in the exposed part of the existing pipe, a new pipe with an outer diameter smaller than the inner diameter of the existing pipe is carried into the existing pipe through the hole, and a number of supports extending horizontally are attached at intervals at the lower part of the existing pipe. Since the new pipe is moved on the support material and placed in a predetermined position, it is easy to place the new pipe within the existing pipe. Since the new pipes arranged in this way are connected within the existing pipes, the new pipes can be of any length. Furthermore, since the new pipe is fixed within the existing pipe after it is connected, the new pipe can be reliably installed without any disturbance. After that, the branch pipe is connected to the new pipe within the existing pipe, making it easy to connect the branch pipe.

All that is left is to backfill, and since the amount of backfilling soil is small, backfilling is easy. Thus, the method of the present invention provides the advantage that existing underground pipes can be easily repaired.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view illustrating some of the steps involved in the method of the invention. FIG. 3 is a longitudinal sectional view showing yet another step of the method of the invention. Figure 3 is
It is an enlarged cross-sectional view taken along the line IV-1t, with a portion of the figure cut away. FIG. 5 is a sectional view taken along the line V-V in FIG. 7. Figures 2 to 7
The figure is a cross-sectional view of an existing pipe and a new pipe in the method of this invention. FIG. 1θ is a partially cutaway perspective view showing still another step of the method of the present invention. Figures 1/-1j are cross-sectional views of a tube illustrating further steps of the method of the invention. Figure 6 Figure 7 Figure q JP-A-Sho GO-155080 (8)

Claims (1)

[Claims] Excavate the ground to expose a part of the existing pipe buried underground, make a hole in the exposed part of the existing pipe, carry a new pipe with an outer diameter smaller than the inner diameter of the existing pipe through the hole, and insert it into the existing pipe. A number of supporting members extending horizontally are attached to the lower part at intervals, the new pipe is moved on the supporting members and placed in a predetermined position, the new pipe is connected within the existing pipe, and is fixed within the existing pipe, A method for repairing underground pipes, which is characterized by connecting a new pipe to an existing branch pipe and backfilling the existing pipe.