JPH01235796A - Repairing method for underground embedded pipe - Google Patents

Abstract

PURPOSE:To shorten the term of construction and reduce a cost, by inserting a fluid means excavating device into ground with the guide of the repairing object section of an embedded pipe, from the excavated hole of the embedded pipe, and by leaving a cylindrical member fitted externally on the embedded pipe for a guide. CONSTITUTION:A fluid means excavating device D is inserted into ground with the guide of the repairing object section 1a of an embedded pipe 1, from the excavated hole 2 of the underground embedded pipe 1, and by discharge fluid, earth is excavated, and on the outer periphery of the repairing object section 1a, a repairing cavity section 14 is formed. After that, among the fluid means excavating device D, a cylindrical member 8 fitted externally on the embedded pipe 1 as a guide in case of insertion is left in ground as the component member of the external surface coating layer of the repairing object section 1a. Then, in the repairing cavity section 14, a sealing material 5 is injected, and is worked together with the cylindrical member 8, and the repairing, object section 1a is coated. As a result, the work can be simplified, and can be satisfied with strength and durability.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention involves excavating a part of an underground pipe, and using the underground pipe as a guide from the excavation hole formed by the excavation. and forming a repair cavity in the ground around the outer periphery of the repair target part of the underground pipe using the excavation equipment, and using the repair cavity to cover the repair target part. Concerning repair methods for underground pipes that form layers.

[Conventional technology]

Conventionally, as shown in Fig. 8, an excavator (G) is installed in the excavation hole (2) of the underground pipe (1),
) The cylindrical blade body (22
) is pushed into the ground while being rotated by the drive device (23),
A repair cavity (14) is formed on the outer periphery of the repair target part (1a) by the mechanical scraping action of the cylindrical blade (22), and then a sealing material is injected into the repair cavity (14). (For example, Japanese Patent Application Laid-Open No. 55-33966
(see publication).

[Problem to be solved by the invention]

However, since a large driving force is required to rotate and push the cylindrical blade (22), the drilling equipment (G) installed in the excavation hole (2) becomes quite large, and the drilling equipment (G
) must be secured in the excavated hole (2) to operate the excavated hole (2), and since the excavated hole (2) is quite large, it is necessary to perform excavation work, backfilling work, treatment of excavated earth and backfilling earth, etc. In addition, the outer coating layer had insufficient strength and durability, and there was room for improvement in the outer coating layer.

An object of the present invention is to make it possible to sufficiently reduce the excavation hole for underground pipes, thereby sufficiently reducing costs and labor and shortening the construction period. The object of the present invention is to enable easy and rapid formation of an outer surface coating layer having excellent durability and durability.

[Means to solve the problem]

The characteristic means of the present invention is to insert the repair target part of the underground pipe into the ground from the excavation hole of the underground pipe as a guide to form a repair cavity located around the outer periphery of the repair target part. As the excavation device, a fluid-type excavation device that excavates earth and sand with a jetting fluid is used, and the excavated earth and sand is caused to flow into the digging hole by the action of the jetting fluid and taken out from the digging hole,
Then, when forming the outer surface coating layer using the repair cavity, a cylindrical member of the fluid excavation device that is fitted onto the underground pipe so as to serve as a guide is placed on the outer surface. The purpose is to leave it underground as a constituent material of the covering layer, and its effects are as follows.

[For production]

In other words, the earth and sand are excavated with the ejected fluid, and the excavated earth and sand is flowed into the excavated hole by the ejected fluid and taken out from the excavated hole.
There is almost no earth and sand resistance against the excavation equipment, and it is sufficient to simply apply a small pushing force to the hydraulic excavation equipment to cause it to slide against the portion of the underground pipe to be repaired.

Therefore, it is possible to push the hydraulic excavation rig by using a pushing device installed on the ground or by manual pushing to make the excavation hole small enough to accommodate the hydraulic excavation rig, or to install a small pushing device inside the excavation hole. The excavation hole can be made smaller, and the cost and labor required for excavating the excavation hole, backfilling work, and treatment of excavated earth and backfilling earth and sand can be sufficiently reduced, and the construction period can be sufficiently shortened.

Moreover, the cylindrical member fitted onto the repair target part is used as a component of the outer surface coating layer of the repair target part, and the sealing material injected into the repair cavity cooperates with the cylindrical member, or airtightness is achieved. By repairing only with a solid cylindrical member, it is possible to improve the strength and durability against external forces such as loads from the road surface by repairing the outer surface coating layer, which is more eroded than by repairing with only a sealing material as in the prior art described above. Can be formed.

In addition, since the cylindrical member is provided in the hydraulic excavation equipment to be pushed into the ground using the underground pipe as a guide, for example, after recovering the fluid excavation equipment, another cylindrical member may be used for repair. Compared to inserting it into a cavity, the retrieval work is easier and no insertion work is required, so the work can be carried out easily and efficiently.

〔Effect of the invention〕

As a result, we have found that repairs using a repair cavity that extends all the way around the entire length of the part to be repaired of underground pipes can be performed with less cost, labor, and construction time.
In addition, a method for repairing underground pipes which is actually superior in terms of strength and durability of the outer coating layer has been obtained.

〔Example〕

Next, examples will be shown.

As shown in Figure 1 (a), the - part of the underground pipe (1) is drilled into the paved road at one end of the area to be repaired (1a), and then excavated with a hydraulic vertical hole excavator (A). to form a digging hole (2).

The vertical hole excavator (A) uses a guide pipe (3), a fountain pipe (5) connected to a pressurized water supply pump (4), a fumarole pipe (7) connected to a pressurized air supply compressor (6), etc. It is constructed so that earth and sand are excavated with the ejection of water and air, and the excavated earth and sand is raised by an air-water mixed phase flow.
The excavated earth and sand that has risen is removed from the excavation hole (2) using the suction and discharge device (B).
).

As shown in Figure 1 (b), the vertical hole excavator (A) was recovered and the fluid excavator (D) pulled out from the winder (C) was buried underground in the excavation hole (2). Attach to pipe (1).

As shown in Fig. 2, the fluid drilling device ff (D) has a flexible stainless steel thin plate (9
), and then install the fountain nozzle (10) and the fume nozzle (1).
1) is attached to the thin plate (9) facing the tip side, and the hose (12) is connected to these nozzles (10) and (11), and pressurized fluid is supplied via the rotary joint of the winder (C). Connect the device (E) to the hose (12) and remove the strip (8).
A fastener (13) for retaining the cylindrical shape wrapped around the underground pipe (1) is attached to the band-shaped body (8) so that it can be freely connected and disconnected.

As shown in Figure 1 (c), Nozunosen10), (11
), the area to be repaired (1a
) A suction/discharge device (B) that excavates earth and sand around the entire circumference and causes the excavated earth to flow out into the excavation hole (2) by the action of jetting fluid.
Take it out from the digging hole (2).

Then, the strip (8) and the hose (12) are pulled together by a winding machine (C).
) and while closing the zipper (13), push it into the ground using the part to be repaired (1a) as a guide, and create a repair cavity (14) that extends around the entire length of the part to be repaired (1a).
is formed underground using a fluid excavation device (D).

Pushing in the strip (8) and hose (12), fastener
The closing operation (13) is performed manually from the ground or by a suitable pushing machine installed above ground or in the dug hole (2).

As shown in Figure 1 (d), a sealant injection device (F) is connected to the winder (C) instead of the pressurized fluid supply device (ε), and the fluid excavation device (D) is stopped. In this state, the sealing material (15) from the injection device (F) is injected into the repair cavity (14) using the hose (12) and nozzles (9) and (10).

As shown in Figure 1 (e), after injecting the sealing material (15) into the entire repair cavity (14), cut the strip (8) and hose (12) to an appropriate length. In addition to remaining underground, a fluid excavation device (D) and a suction and discharge device (B) are installed.
The excavated hole (2) is recovered, the excavated hole (2) is backfilled, the perforated part (16) of the paved road is repaired, and the area to be repaired (1a) is repaired by working together with the solidified sealant (15) and the strip (8). Form an outer covering layer and complete the construction.

As the sealing material (15), an organic material such as thermoplastic, thermosetting, room temperature curable, moisture curable, or two-component reactive resin, or an inorganic material such as water glass or cement is used. Thermoplastic resins include polyethylene, vinyl chloride resin, polypropylene, styrene resin, ABSII resin, polyvinyl alcohol, acrylic resin, acrylonitrile-styrene resin, vinylidene chloride resin, and AAS.
(ASA) resin, AES resin (weather resistant, impact resistant resin)
, cellulose derivative resin, thermoplastic polyurethane, polyvinylbutyranobevoly 4-methylpentene-1, polybutene-1, and the like. Examples of thermosetting resins include unsaturated polyester resins, epoxy resins, phenol resins, urea resins, melamine resins, diallyl phthalate resins, silicone resins, and polyurethanes.

[Another example]

Next, another example will be shown.

To form the excavation hole (2) of the underground pipe (1), any suitable means can be used, such as using a known vertical hole excavator such as a rotary drill type, or manual excavation. Further, dug holes (2) may be formed on both sides of the repair target portion (1a).

The configuration of the fluid excavation device (D) can be changed as appropriate, and for example, the configurations listed in (a) to (v) below can be used.

(a) The strip (8) is formed of cloth, cloth (7), film, porous film, or other suitable material, such as a hose or corrugated pipe that can be cut at one point in the circumferential direction.

(b) Thin plate at the tip (9), nozzle (10), (11
) is omitted and the hose (12) is attached to the tip of the strip (8).
Fix the tip of the

(c) Place the hose (12) inside, outside, or within the thickness of the strip (8).

(d) Instead of the zipper (13), use an appropriate connecting means such as a hook type or button type.

(e) Instead of the strip (8), as shown in Figure 3,
The cylindrical half body (17) is held in a cylindrical shape by the first connecting portion (18), and the adjacent half cylindrical bodies (17) are
They may be used by connecting at the connecting portion (19), and the half-split cylindrical body (17) may be added. A cylindrical member (8),
(17).

(f) Nozzle for fluid ejection (10), (11)
The number of hoses (12) installed can be changed appropriately, and the ejected fluid can be appropriately selected, such as water or a mixture of water and air.

To remove the excavated earth and sand from the excavated hole (2), any known suitable device can be used, or it may be done manually.

As shown in Figure 4, the excavation hole (2) is connected to the area to be repaired (
1a), and a repair cavity (14) may be formed from the excavation hole (2) toward both sides using a fluid drilling device (D).

To inject the sealing material (15) into the repair cavity (14), as shown in FIG. (14) or the hose (12) as shown in Figure 6.
Inject while pulling back the chisel, or fill the repair cavity (
14), or by supplying the sealant (15) to the fluid-type excavation device (D) as a jetting fluid for earth and sand excavation, the sealant injection process can be omitted. You can also use various other methods.

When injecting the sealant, there may be some dirt left inside the cylindrical members (8), (17), but the sealant (15) may be injected after the dirt is sufficiently discharged with fluid.

Cylindrical members (8), (17) without injection of sealant
is made of an airtight material, and a cylindrical member (8).

A cylindrical member (8) in which the joint portions of (17) are airtightly joined by heat welding or adhesive and fitted onto the underground pipe (1).

(17) to be airtight, and use a tightening band (25) as shown in Figure 7 (a) or a sealing material (26) as shown in Figure 7 (b). , cylindrical member (8),
The outer surface coating layer may be formed only by the cylindrical members (8) and (17) by closing the space between both ends of the pipe (17) and the underground pipe (1).

In addition, the cylindrical members (8) and (17), which can form an outer surface coating layer by themselves as described above, are combined with the sealing material (15) as in the above embodiment to form an outer surface coating layer with excellent sealing properties. may be formed. In addition, the airtight cylindrical member (8),
(17) is made of a heat-shrinkable material such as polyethylene, and the cylindrical members (8) and (17) are brought into close contact with the area to be repaired (1a) by heating with hot water or hot air passed through the hose (12). , the sealing effect may be sufficiently maintained even if a portion of the cylindrical members (8), (17) is torn.

The underground pipe (1) is not limited in type, material, structure, etc., and may be used for city gas, water, hot water, electric cables, etc., and the purpose of repair is to remove corroded and thinned parts. reinforcement, repair of defects in paint or covering materials, repair of leaks in joints, or anything else.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

FIG. 1 (A) to (E) are explanatory views of the construction procedure in an embodiment of the present invention, and FIG. 2 is a partial view of the excavation equipment used. FIG. 3 is an explanatory diagram of another embodiment of the drilling equipment used in the present invention. Figures 4, 5, 6, and 7 (a). (B) is an explanatory diagram of each different embodiment of the present invention. FIG. 8 is an explanatory diagram of a conventional example. (1)・・・Underground pipe, (1a)・・・・・・
Part to be repaired, (2)...Dug hole, (8),
(17>... cylindrical member, (2)...
Hose, (14)... Repair cavity, (15)
...Sealing material, (D) ...Fluid type drilling equipment.

Claims (1)

[Claims] 1. A part of the underground pipe (1) is excavated, and an excavation device is inserted into the ground through the excavation hole (2) formed by the excavation, using the underground pipe (1) as a guide. A repair cavity (14) located on the outer periphery of the repair target portion (1a) of the underground pipe (1) is formed underground using the excavation equipment, and the repair cavity (14) is utilized. The part to be repaired (1a)
A method for repairing underground pipes forming an outer surface covering layer covering the underground pipe, wherein a fluid-type excavation device (D) that excavates earth and sand with a jet of fluid is used as the excavation equipment, and the excavated earth and sand are excavated by the action of the jet of fluid. When the fluid is discharged into the excavation hole (2) and taken out from the excavation hole (2) to form the outer surface coating layer, it is guided to the underground pipe (1) of the fluid excavation device (D). Cylindrical members (8), (17) fitted externally to
) is left underground as a component of the outer surface coating layer. 2. After forming the repair cavity (14), a sealant (15) is injected into the repair cavity (14), and the sealant (15) and the cylindrical member (8), ( 17) The method for repairing underground pipes according to claim 1, wherein the outer surface coating layer is formed in cooperation with 17). 3. The underground pipe repair method according to claim 2, wherein the sealing material (15) is injected by a hose (12) provided in the fluid excavation device (D). 4. Supplying a sealing material (15) as an ejection fluid for earth and sand excavation to the fluid excavation device (D), and supplying the sealing material (15)
The method for repairing an underground pipe according to claim 1, wherein the outer surface coating layer is formed by cooperation of the cylindrical member (8) and the cylindrical member (17). 5. The cylindrical members (8), (17) are formed to be airtight, and the space between both ends of the cylindrical members (8), (17) and the underground pipe (1) is airtight. Claims 1 to 4 obstructing
A method for repairing underground pipes as described in any of the above. 6. The cylindrical members (8), (17) are made of a heat-shrinkable material, and the cylindrical members (8), (17) are brought into close contact with the repair target portion (1a) by heating. Repair method for underground pipes described.