JPH0868097A - Sheathing method in connection construction to existing pipe - Google Patents

Abstract

PURPOSE: To sheathe the periphery of an existing pipe positively, and to conduct the connection operation of a branch pipe, etc., safely and quickly when a cylindrical casing is pressed toward the existing pipe buried into the ground from a ground surface, the inside of the casing is excavated and a shaft is formed. CONSTITUTION: A cylindrical casing 5 having a notch 4 having width broader than the diameter of an existing pipe is pressed into a front end section from the upper section of the existing pipe 2. The periphery of the existing pipe 2 is surrounded by the cylindrical casing 5 so that the existing pipe 2 is fitted into the notch 4, the inside of the cylindrical casing 5 is excavated, and a branch pipe 3a is connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth retaining method for connecting a new branch pipe or the like to an existing pipe buried in the ground such as electricity, gas, water and sewage.

[0002]

2. Description of the Related Art For example, when connecting a domestic sewage basin 1 (see FIG. 6) to a sewage main 2 buried in the ground, a vertical shaft is excavated from the surface to the sewage main 2, and It is necessary to expose the main pipe 2, take out the branch pipe 3 (shown in phantom in FIG. 6) from the sewage main pipe 2, and connect it to the waste water measure 1. Since the sewage main 2 is buried deep in the ground, conventionally, when excavating a vertical shaft, a steel sheet pile is driven so as to surround the periphery of the sewage main 2, and the inside of the sewer is used as earth retaining. Although it was attempted to excavate to the position of the main pipe 2, this method is labor-intensive, and in addition, it is necessary to install supports in multiple stages in the space surrounded by the steel sheet pile after the driving, resulting in work efficiency. There was a problem of being low.

As disclosed in Japanese Unexamined Patent Publication No. 6-146382, there is also known a method in which a cylindrical casing, instead of a steel sheet pile, is press-fitted from the surface toward the main sewer pipe and the inside is excavated. Since the casing can be press-fitted only up to the front of the main sewer pipe 2, when the inner side of the main sewer pipe 2 is excavated to expose the main sewer pipe 2, depending on the ground, the earth and sand wrap around from the lower end of the casing to the main sewer pipe 2, There is a case where the branch pipe 3 (3a) cannot be connected because it is buried in the earth and sand.

[0004]

The present invention has been made in view of the above problems, and a cylindrical casing is press-fitted from the ground surface toward an existing pipe buried in the ground, and the inside thereof is excavated. When forming a vertical shaft, the purpose is to reliably perform earth retaining around the existing pipe and to safely and promptly connect the branch pipe and the like.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method of earth retaining in connection work to an existing pipe, which comprises excavating a vertical shaft toward an existing pipe buried in the ground and exposing the existing pipe to the vertical shaft. When connecting a new branch pipe or the like to this, a cylindrical casing having a notch wider than the diameter of the existing pipe at the tip is pressed into the existing pipe, and the existing pipe fits into the notch. It is characterized in that the surrounding of the existing pipe is surrounded by the cylindrical casing so as to be inserted.

According to the present invention, before press-fitting the cylindrical casing having the notch, if necessary, another cylindrical casing is press-fitted up to the front of the existing pipe and the inside is excavated, followed by cutting. You may make it press-fit the said cylindrical casing provided with the notch toward the said existing pipe from the inner side of the cylindrical casing which has been press-fitted.

[0007]

According to the present invention, since the circumference of the existing pipe is surrounded by the cylindrical casing except for a part in the lengthwise direction, this becomes a soil retaining and the earth and sand outside the casing wrap around inward. It can be prevented from falling down.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. (Example 1) In FIG. 1, a vertical shaft is excavated toward a main sewer pipe 2 buried in the ground, the main sewer pipe 2 is exposed in the vertical shaft, and a new branch pipe 3 (3a) is provided therein. It shows the work procedure when connecting.

(A) First, a pair of notches having a width wider than the diameter of the main sewer pipe 2 is provided at a symmetrical position at the lower end from above the place where the branch pipe 3a of the main sewer pipe 2 is connected, as shown in FIG. The cylindrical casing 5 with 4 is pressed in. In addition, in FIG. 2, 6 is a cutting tooth formed at the tip of the casing.
As a press-fitting means for this casing 5, for example, Japanese Patent Publication No.
A known rocking press-fitting device described in Japanese Patent Publication No. 83717 can be used.

(B) The press-fitting of the casing 5 is stopped before the main sewer 2 and the inside of the main sewer 2 is excavated to confirm the position and direction of the main sewer 2. The excavation may be performed all at once after the casing 5 reaches this position, or may be sequentially performed as the press-fitting progresses. (C) Next, the casing 5 is positioned as necessary so that the main sewer pipe 2 fits in the notch 4, and then press-fitted into the ground (see FIG. 3). With this, the periphery of the main sewer pipe 2 is surrounded by the casing 5 except for a part in the length direction.

(D) Subsequently, the inside of the casing 5 is excavated to expose the sewer main 2, and (e) the branch pipe 3a is attached to the sewer main 2.
Is attached (see FIG. 4), (f) the earth and sand are backfilled to a depth that does not require earth retaining, and (g) the casing 5 is pulled up. (H) With this, the construction of the deep portion where the earth retaining is necessary (shown by a in FIG. 6) is completed, and subsequently, the shallow portion where the earth retaining is not necessary (shown by b in FIG. 6) is a so-called element. It excavates by excavation, installs the branch pipe 3b, connects it to the existing branch pipe 3a and the wastewater basin 1, and finally backfills the earth and sand.

In addition, the confirmation step such as the working step (b) is provided in the first embodiment because the actual depth, position, direction, etc. of an underground buried pipe such as a sewer main are different from the laying drawings. There may be some errors, and if you press-fit to the position (c) without confirmation, the underground burial pipe may be damaged, but the notch 4 is sufficiently wider than the underground burial pipe, or other reasons. If there is not, this confirmation step may be omitted.

(Embodiment 2) In FIG. 2, a vertical shaft is excavated toward a main sewer pipe 2 buried in the ground, the main sewer pipe 2 is exposed in the vertical shaft, and a new branch pipe 3 is provided therein. It shows another embodiment of the work procedure when connecting (3a).

(A) First, the first cylindrical casing 7 is press-fitted from above the location where the branch pipe 3a of the main sewer 2 is connected. The casing 7 has no notch (however, a cutting tooth is formed at the tip). (B) Stop press-fitting the casing 7 before the main sewer pipe 2,
The inside is excavated and the position and direction of the sewer main 2 are confirmed. The excavation may be performed all at once after the press-fitting of the casing 7 is completed, or may be sequentially performed as the press-fitting progresses. (C) Next, the second cylindrical casing 8 having the same structure as the casing 5 of the first embodiment is fitted inside the casing 7, and the sewer main pipe 2 is press-fitted into the ground so that the notch 9 fits in. . With this, the periphery of the main sewer pipe 2 is surrounded by the casing 8 except for a part in the length direction.

(D) Subsequently, the inside of the casing 6 is excavated to expose the sewer main 2, and (e) the branch pipe 3a is attached to the sewer main 2.
Is attached, and (f) earth and sand are backfilled to a depth that does not require earth retaining, and (g) the casing 8 and then the casing 7 are pulled up. (H) With this, the construction of the deep portion where the earth retaining is necessary is completed, and thereafter, like the first embodiment, the shallow portion where the earth retaining is not necessary is excavated by so-called unearthing, and the branch pipe 3
Install b and connect it to the existing branch pipe 3a and the sewage box 1, and finally backfill with earth and sand.

In the second embodiment, the depth, position, direction, etc. of the sewer main can be confirmed by first press-fitting the casing 7 and excavating the inside of the casing 7, and when excavating, the earth and sand are pushed out inward. Since it does not occur, the confirmation can be performed relatively easily, and there is an advantage that no excessive force is applied to the cutout portion when the casing 8 is rocking and press-fitted.

[0017]

According to the present invention, since the circumference of the existing pipe is surrounded by the cylindrical casing except for a part in the lengthwise direction, this serves as an earth retaining material, and the earth and sand outside the casing are turned inward. It can be reliably prevented from falling or falling. Therefore, it becomes possible to safely and quickly perform the connecting work of the branch pipe and the like.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a work procedure (Example 1) when connecting a branch pipe to a main sewer pipe buried in the ground.

FIG. 2 is a perspective view of a cylindrical casing having a notch.

FIG. 3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a plan view of FIG. 1 (e).

FIG. 5 is an explanatory diagram showing a work procedure (Example 2) when connecting a branch pipe to a main sewer pipe buried in the ground.

FIG. 6 is an explanatory diagram of how the branch pipe is attached to the main sewer pipe.

[Explanation of symbols]

 2 Sewage mains 3 (3a, 3b) Branch pipes 4, 9 Notches 5, 8 Cylindrical casing with notches 7 Cylindrical casing without notches

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Miki Inaoka 10 Mole Industry Co., Ltd. 55 55 Izumida, Okayama City, Okayama Prefecture

Claims (2)

[Claims] 1. When excavating a vertical shaft toward an existing pipe buried in the ground, exposing the existing pipe into the vertical shaft, and connecting a new branch pipe to the vertical pipe, the existing pipe is A cylindrical casing having a cutout wider than the diameter is press-fitted toward the existing pipe, and the existing pipe is surrounded by the cylindrical casing so that the existing pipe fits into the cutout. Soil retaining method for connection work to existing pipes. 2. Before press-fitting the cylindrical casing having a notch, another cylindrical casing is press-fitted before the existing pipe and the inside is excavated, and then the cylindrical casing having the notch. The earth retaining method for connection work to an existing pipe according to claim 1, wherein the casing is pressed into the existing pipe from the inside of the already pressed cylindrical casing.