JPH09207216A - Laying of sheathing pipe for cable insertion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily lay a sheathing pipe and maintain it in a serviceable condition for a long time by forming a liner through the through holes of a spacer at the upper part of the inner face of a sewage pipe, then inserting sheathing pipes for cable insertion through a passageway under the upper part of the inner face of the sewage pipe, and packing a back filling material into the back side of the liner and the passageway through through holes. SOLUTION: A porous curved plate-like spacer 2 is provided across the entire length of a top area inside an existing sewage pipe 1, and a passageway for a back filling material is formed between the spacer 2 and the top inner part of sewage pipe 1. In addition, numerous through holes 5 for the back filling material are formed in the spacer 2, and flexible sheathing pipes 6 are inserted running through the center part 3A of the passageway 3 in the pipe axial direction and are held between a rib piece 4 and pins 7. Further, a liner 10 is formed by strips 8 and joiners 9 from the top of the spacer 2 in the sewage pipe 1, and a hose is inserted into the center part 3A of the passageway 3 to pack the back filling material into the center part 3A. The back filling material is packed into a void 13 on the back face side of the liner 10 passing through the through holes 5 and at the same time, is packed into both side parts 3B, 3B of the passageway 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying a cable insertion sheath tube.

[0002]

2. Description of the Related Art Recently, it has been practiced to lay communication cables such as optical fiber cables by utilizing existing sewer pipes that run underground. Conventional installation methods include tube bottom rolling method, direct pipe installation method, and sheath tube internal installation method.In particular, the sheath tube internal installation method is used from the viewpoint of cable protection because the cable is inserted into the sheath tube. This is a desirable construction method.

[0003]

The sheath pipe laying method is a method of inserting and installing various cables into the sheath pipe laid inside the existing sewer pipe, and the laid sheath pipe is installed on the inner wall of the sewer pipe such as a saddle. Although it is mounted and fixed by applying a mounting bracket, there is a problem that this fixing and fixing work of the sheath tube requires a lot of manpower and time, and the installation cost is high.

Further, since the attached sheath pipe projects inward from the inner wall of the sewer pipe, when the water level in the sewer pipe becomes high, the attaching and fixing portion of the sheath pipe collides with solid matter in the sewer water. There is a problem in that it may be damaged and maintenance work is troublesome.

In addition, as a sheath pipe, a hard one such as metal or hard plastic is generally used as a measure for preventing rodent damage. However, a hard sheath pipe is troublesome because it must be replenished in the sewer pipe when installing.

[0006] The present invention has been made to eliminate such a conventional problem.

[0007]

According to the present invention, a perforated bay plate-shaped spacer having a large number of through holes through which a backfill material can flow is fixedly installed over the entire length of an inner surface upper region of an existing sewer pipe, For injecting a backfill material based on the spacer between the liner and the upper surface of the inner surface of the sewer pipe by forming a liner by spirally winding a strip with a back rib on the inner surface of the sewer pipe through the spacer A passage is formed, and before or after forming the liner, at least one flexible plastic sheath tube for inserting a cable is inserted and installed in the passage, and thereafter, the passage is formed through the through hole of the spacer from the passage. By injecting and filling the back-filling material into the inside of the passage while injecting and filling the back-filling material on the back side of the liner, the sheath tube can be embedded and fixed in the filling layer in the passage of the back-filling material. According to laying method of the cable insertion sheath tube, characterized.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

In carrying out the method of the present invention, as schematically shown in FIG. 1, a perforated bay plate-shaped spacer 2 is attached and fixed over the entire length of the top region in the existing sewer pipe 1.

As shown in FIGS. 2 and 3, the spacer 2 is for forming a backfilling material injecting passage 3 extending in the axial direction of the sewer pipe 1 in the top region thereof, as shown in FIG. The both ends of the sewer pipe 1 are in contact with the inner surface of the sewer pipe 1 in a state of being curved in a direction along the inner peripheral surface of the sewer pipe 1.

The radius of curvature of the spacer 2 is larger than the radius of curvature of the inner peripheral surface of the sewer pipe 1. Based on this radius of curvature difference,
A backfill material injection passage 3 is formed between the spacer 2 and the inner peripheral surface of the sewer pipe 1.

As shown in FIG. 2, two parallel rib pieces 4 and 4 are formed on the convex side of the spacer 2 so as to face each other with a vertical plane passing through the central axis of the sewer pipe 1 therebetween. The tips of the rib pieces 4, 4 are in contact with the inner surface of the sewer pipe 1.

The central portion 3A of the passage between the rib pieces 4 and 4 is mainly used for injecting the backfill material.

The spacer 2 has a large number of backfill material through holes 5.
Are formed so as to be dispersed over the entire surface including the rib pieces 4 and 4.

The spacer 2 is carried into the sewage pipe 1 through the manhole a under a standard size of, for example, about 1 to 3 m, and the spacers 2 are sequentially added in the sewage pipe 1 in the axial direction of the pipe, such as anchor bolts. Mounting bracket (not shown)
Is applied and fixed to the inner surface of the pipe.

As shown in FIGS. 1 and 2, the sheath tube 6 is inserted so as to pass through the passage central portion 3A in the tube axial direction.

The insertion of the sheath pipe 6 into the passage central portion 3A may be carried out after the spacer 2 is attached and fixed. For example, as shown in FIG.
If the spacer 2 is attached and fixed in a state in which the spacer 2 is inserted at the predetermined insertion position, the spacer 2 can be attached and fixed and the sheath pipe 6 can be inserted in parallel.

As the sheath pipe 6, a flexible plastic pipe is used for easy insertion into the sewer pipe 1, and a bellows-like one is particularly suitable because of its excellent flexibility.

FIG. 2 shows a case where two sheath tubes 6 are inserted, but the number of inserted tubes is not particularly limited.

By sandwiching the sheath tube 6 between the rib piece 4 and the pin 7 as shown in FIG. 2, the sheath tube 6 can be fixed at the insertion position. As shown in FIG. 3, the pins 7 are intermittently formed at appropriate intervals in the tube axis direction.

After the spacer 2 is fixedly attached, a liner 10 is formed in the sewer pipe 1 from above the spacer 2 by using a strip 8 and a joiner 9 as shown in FIGS. . As shown in FIG. 7, the strip 8 applied to the formation of the liner 10 includes a pair of left and right joining rib pieces 11 protruding outward over the entire length of both side portions.
As shown in FIG. 7, a pair of right and left ribs 11 and 11 jointly form two parallel engaging grooves 11 a and 11 a along the spiral joint 10 a of the liner 10.

A strip-shaped joiner 9 is applied to join and integrate the spiral joint 10a of the liner 10,
The joiner 9 is provided with the engaging recesses 11a, 11 on the outer surface side.
Two parallel engaging protrusions 9a, 9a elastically fitted to a
And these engaging concavo-convex strips 11a, 11a, 9a, 9
The above-mentioned joining portion 10a can be joined and integrated by elastic fitting of a.

The strip 8 is provided with an appropriate number of reinforcing rib pieces 12 ... In parallel with the joining rib pieces 11, such as T-shaped and Y-shaped rib pieces 12, and the tips of the rib pieces 12 ... are liner as shown in FIG. When forming 10, the inner surfaces of the sewer pipe 1 and the spacer 2 are abutted, and in cooperation with the rib pieces 11 and 11, a gap 13 necessary for filling grout is formed between the inner surfaces of the sewer pipe 1 and the spacer 2. . The liner 10 may be formed by a known method of forming the liner 10 by spirally winding the strip alone.

After forming the liner 10, as shown in FIG. 8, a backfill material injection hose 14 is inserted into the central portion 3A of the passage 3 formed at the top of the sewer pipe 1, and the hose 14 is inserted into the central portion 3A. The backfill material 15 is injected and filled from the tip of 14.

The back-filling material injected and filled in the central portion 3A of the passage has the through-holes 5 dispersedly formed on the entire surface of the spacer 2.
While being injected and filled into the space 13 on the back side of the liner 10 through the through holes 5, the ribs 4 and 4 are also injected and filled into both side portions 3B and 3B of the passage 3. In this case, the filling and filling of the backfill material into both sides 3B, 3B of the passage may be hindered by the sheath tubes 6, 6, but for example, by using a bellows-shaped sheath tube 6, the backfill material is filled. A passage can be secured. In some cases, a hose (not shown) may be inserted into both side portions 3B, 3B of the passage so that the backfill material is injected and filled simultaneously with the hose 14 from the hose. You may

FIG. 9 shows the situation at the end of the step of filling and filling the backfill material, in which the sheath tubes 6, 6 are embedded and fixed in the backfill layer 15a filled and filled in the central portion 3A of the passage.

[0027]

In the method of the present invention, since the sheath pipe can be laid inside the sewer pipe when the inner surface of the sewer pipe is lined, the construction cost for constructing the sheath pipe is almost unnecessary. Since the long sheath pipe can be drawn into the sewer pipe by utilizing the flexibility of the sheath pipe, the sheath pipe laying work becomes easy and the sheath pipe laying work cost can be reduced.

Furthermore, since the sheath pipe is embedded and fixed in the backfill layer, it does not come into contact with sewage and is not squeezed by a rat, so that the installed condition at the beginning of construction can be maintained semipermanently and maintenance is maintained. There is no hassle.

[Brief description of drawings]

FIG. 1 is an overall view schematically showing how a spacer is attached and fixed in a method of the present invention.

FIG. 2 is an enlarged vertical sectional view taken along line 2-2 of FIG.

FIG. 3 is a vertical cross-sectional view taken along line 3-3 of FIG. 2, in which a sheath tube is omitted.

FIG. 4 is an overall view schematically showing an insertion state of a sheath pipe into a sewer pipe.

FIG. 5 is a view corresponding to FIG. 3, which schematically shows the formation state of the liner.

FIG. 6 is a diagram corresponding to FIG.

FIG. 7 is an explanatory view showing a joining and unifying state of a spiral joining portion of a strip.

FIG. 8 is a view corresponding to FIG. 5, showing a state of injection and filling of a backfill material.

FIG. 9 is a view corresponding to FIG. 6 showing a state after backfilling material is injected and filled.

[Explanation of symbols]

 1 Existing sewer pipe 2 Spacer 3 Passage for injection of backfill material 4 Rib piece 5 Backfill material through hole 6 Sheath pipe 7 pin 8 Strip 9 Joiner 10 Liner 11 Rib piece for joining 12 Reinforcing rib piece 13 Void 14 Injection hose 15 Backfill material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Sakuma 3 1-3 Nihombashi Muromachi Chuo-ku, Tokyo Kubota Tokyo Head Office (72) Inventor Kazuhiro Hirao 64 Ishizukita-machi, Sakai-shi, Osaka Kubo Co., Ltd. (72) Inventor Akira Kamiide 7-6 Eizashicho, Tennoji-ku, Osaka-shi, Osaka Pref. Osaka Waterproof Construction Co., Ltd. (72) Inventor Hitoshi Miura, 7-6 Eizashi-cho, Tennoji-ku, Osaka, Osaka In-house

Claims (3)

[Claims] 1. A perforated bay plate-shaped spacer having a large number of through holes through which a backfill material can flow is fixedly installed over the entire length of the inner surface upper area of an existing sewer pipe, and the spacer of the sewer pipe is inserted through the spacer. Before the formation of the liner, a liner is formed on the inner surface by spirally winding a strip with back ribs to form a backfill material injection passage based on the spacer between the liner and the upper area of the inner surface of the sewer pipe. After the formation, at least one flexible plastic sheath tube for inserting a cable is inserted and installed in the passage, and then a backfill material is injected and filled from the passage through the through hole of the spacer to the back side of the liner. At the same time, the sheath tube for cable insertion is characterized in that the sheath tube is embedded and fixed in the filling layer in the passage of the backfill material by injecting and filling the backfill material also in the passage. Laying method. 2. The laying method according to claim 1, wherein the liner is formed of the strip and a joiner for joining and integrating a spiral joint portion of the strip. 3. The laying method according to claim 1, wherein a bellows-shaped flexible plastic pipe is used as the sheath pipe.