JPH05331903A - Connection technique for connection pipe for sewage main pipe and core tube for connection - Google Patents

Abstract

PURPOSE:To make it possible to eliminate the need for manual work in a sewage main, and what is more, to collect a core to the ground promptly by pulling up the core cut off from the sewage main by means of a core catch rod. CONSTITUTION:The subsoil is excavated from a ground surface 8 up to the surface of a sewage main 13 by driving a boring machine 9. Then, a core catch rod 4 and a core catcher installed thereto are arranged to run through the sewage main 13 at the center of a connection pipe. Then, a peripheral edge portion of the penetration location is drilled so as to cut off a disk-shaped core C. The cut-off core C is pulled up to the ground by means of the core catch rod 4. In succession with this, the tip of a connection pipe is connected to and fixed with a mounting hole of the sewage main.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting pipe connecting method for communicating rainwater or sewage basins with a sewer main pipe, and a core tube attached to a boring machine for connecting the connecting pipe. It is an object of the present invention to improve the connection workability with respect to the main sewer system and to eliminate the inconvenience that the core cut off in the main sewer system remains after connection.

[0002]

2. Description of the Related Art As a method of connecting a connecting pipe to a main sewer system, for example, the "construction method for installing a sewer pipe" disclosed in Japanese Patent Laid-Open No. 59-68450 and Japanese Patent Laid-Open Publication No.
The method of laying the sewer mains connecting pipe disclosed in No. 1-162644 is known as the most advanced technique.

In all of these, a through hole is formed in the main pipe by the metal crown of the core tube attached to the tip of the rotating rod of the boring machine, and then the tip of the attaching pipe is pushed into the through hole to fix it. In addition, the metal crown is removed from the inside of the main pipe, or the extra portion of the mounting pipe protruding into the main pipe is cut according to the inner surface shape of the main pipe.

[0004]

However, in the case of the above-mentioned conventional method, after the tip of the attachment pipe is aligned with the attachment hole of the main pipe and attached, the worker enters the main pipe and artificially moves. In addition, the workability is remarkably poor because the metal crown is removed and the extra portion of the tip of the mounting pipe is cut.
Not only that, but if the main pipe is bent halfway or the diameter of the main pipe is relatively small, it becomes difficult to perform the work.If the diameter of the main pipe is smaller, the above work inside the main pipe is no longer necessary. Since it was impossible, at least the core of the main pipe cut off from the outside remained in the main pipe, which caused the accumulation of waste in the sewer main pipe.

[0005]

Therefore, in the present invention, various problems in the above-mentioned prior art are solved, the workability of connecting the connecting pipe to the main sewer is improved, and the sewer main having a particularly small diameter is provided. The connection pipe can be connected to the pipe, and the cut core is not left in the main pipe.

[0006] Specifically, specifically, in the case where a boring machine is dug toward the main sewer to excavate a mounting hole in the main sewer and the tip of the connecting pipe is connected and fixed to the mounting hole, the main sewer is connected. The first step of penetrating the core catch rod and the core catcher provided on the rod at the center of the connecting pipe connecting position, and the second step of cutting the circular core by excavating the peripheral portion of the penetrating portion. , Connecting the connecting pipe to the sewer main, comprising a third step of pulling the cut core up to the ground by the core catch rod, and a fourth step of connecting and fixing the tip of the connecting pipe to the sewer main mounting hole Regarding the construction method.

Further, the present invention is a core tube, which is attached to the tip of a spindle rod of a boring machine for digging toward a sewer main, and which has an annular metal crown at its tip. A core catch rod having a drill bit at the tip is provided coaxially with the core tube in the extension direction, and the core catch rod is provided at a distance of at least the thickness of the sewer main from the tip of the core catch rod. It also relates to a core tube for connecting a connecting pipe to a sewer main, characterized in that it is equipped with a catcher.

[0008]

[Operation] After confirming the position of the sewer main by using the manhole near the connecting pipe mounting position, install the boring machine at the connecting pipe mounting position, and match the spindle axis to the sewer main. Fix it. Next, a spindle rod is passed through the spindle, and an auger bit or core tube bit is attached to the tip of the spindle rod to excavate to the surface of the sewer main. After that, if necessary, a casing is inserted to protect the hole wall, and then the bit at the tip of the spindle rod is replaced with the core tube according to the present invention, and the core catch rod projecting coaxially with the core tube is sewered. While abutting on the center of the installation pipe connection planned site on the surface of the main pipe, while rotating this, the cutting bit at the tip digs into the inside of the main pipe. After the bit at the tip has completely entered the main pipe, the core catch rod is further pushed to penetrate the main catcher into the main pipe.

In this state, when the core tube is pushed further toward the sewer main, the metal crown of the core tube makes a circular cut at the planned connecting point of the connecting tube centering on the through point of the core catch rod. Then, the core tube corresponding to the wall thickness of the main pipe is cut off by further pushing in the core tube. The cut core falls along the core catch rod into the main pipe, but is caught by the core catcher provided on the core catch rod and is prevented from falling further. Next, the core tube is lifted and the core catch rod is pulled up, and along with this, the core is taken out from the sewer main to the ground. Then, the tip of the mounting pipe is mounted in the connection hole formed in the main pipe to complete the connection work.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete contents of the present invention will be described below with reference to the embodiments shown in the drawings. 1 is a cylindrical core in which a lower portion is opened and an annular core tube bit 3 is attached to the opening. The core tube 1 is configured such that the core tube head 2 at the upper end can be attached to the spindle rod 11 of the boring machine 9, and one end of the core catch rod 4 is coaxial with the core tube head 2. And it is held integrally.

The core catch rod 4 extends in the tip extension direction from the above-mentioned opening portion of the core tube bit 3 in the tip direction, and a drill bit 6 is formed at the tip thereof, and the core catch rod 4 is provided. 4, a core catcher 7 is attached at a distance of at least the thickness of the sewer main from the tip. In the figure, 5 indicates a steady rest of the core catch rod 4.

The core catcher 7 has, as shown in FIG. 2, for example, a small width spring plate having elasticity and formed in an inverted trapezoidal shape with the upper cut ends separated from each other with respect to the core catch rod 4. Then, by fixing only the lower side of the core catch rod 4, the excavation bit 6 formed at the tip of the core catch rod 4 is excavated toward the inside of the sewer main pipe 13 from its outer surface side. When the core catcher 7 penetrates the wall surface of the sewer main 13, the upper part of the core catcher 4 withdraws toward the inside of the core catch rod 4 against its elasticity, and passes completely through the wall surface of the sewer main 13. When it reaches the inner surface, it can be restored to its original shape again by its original elastic force as shown by the arrow.

Further, the structure of the core catcher 7 is not necessarily limited to the structure of the above-mentioned embodiment, and in addition to this, as shown in FIG. 3, for example, the core catch rod 4 is placed in the vertical position. At a certain time, a plurality of fastening shafts 7b are arranged in the radial direction of the core catch rod 4.
It is rotatably attached by a pair of blade-shaped core catchers 7a having a wider area in the upper part than in the lower part. In the natural state, the upper part is always attached to the upper part by its own weight. It may be opened in opposite directions (arrow directions).

Next, the procedure for attaching the attachment pipe to the main sewer pipe using the core tube 1 of the present invention will be described with reference to FIGS. After confirming the position of the main pipe 13, the boring machine 9 is installed at the mounting position of the connecting pipe 14, and the spindle 10 has its axis aligned with the sewer main 13 and fixed. Next, a spindle rod 11 is passed through the spindle 10, and an auger bit 12 or a core tube bit is attached to the tip of the spindle rod 11 to excavate up to the surface of the sewer main 13.

After that, the spindle rod 11 is once pulled up and a casing (steel pipe) is inserted into the excavation hole to protect the hole wall, and then the auger bit 12 or the core tube bit at the tip of the spindle rod 11 is used in the present invention. Replaced with the core tube 1 according to, the core catch rod 4 which is coaxially projected with the core tube 1 in the distal direction thereof is abutted against the center of the mounting pipe connection planned location on the surface of the sewer main 13, and is rotated. While drilling bit 6 at the tip, sewer main 1
Dig towards the inside of 3. Furthermore, after the drill bit 6 at the tip has completely entered the main pipe, the core catch rod 4 is further pushed in to allow the core catcher 7 to penetrate into the main pipe.

In this state, when the core tube 1 is further pushed toward the sewer main 13, the core tube 1
The core tube bit 3 of the block 1 starts a circular cut at the planned connection point of the connection tube 14 centered on the penetration point of the core catch rod 4 described above, and further pushes the core tube 1 to push the core tube 1 into the sewer main pipe 13. Cut out a circular core C corresponding to the wall thickness. The cut core C falls inward of the main pipe along the core catch rod 4, but is caught by the core catcher 7 provided on the core catch rod 4 and is prevented from falling further. Next, when the core tube 1 is lifted up and the core catch rod 4 is pulled up, the core C cut off along with this is taken out from the sewer main 13 to the ground. Next, a mounting pipe 14 having a mounting port 15 at the tip.
The connection work is completed by inserting and attaching the tip of the above into the connection hole formed in the sewer main 13.

In this case, after the mounting port 15 of the mounting pipe 14 is inserted into the connection hole of the sewer main 13, the mounting port 15 protruding to the inner surface side of the sewer main 13 is as shown in FIG. In addition, the spindle rod 11 is made into a hollow tubular shape, and the marking rod 16 having a marking device 17 in which the tip is folded back in a U shape and a marking pen or the like is attached to the folded tip is inserted into the rod 11. Initially, only the tip of the mounting port 15 is aligned with the connection hole 13a, and the marking rod 16
By marking the inner peripheral surface of the sewer main pipe 13, and then temporarily pulling up the mounting pipe 14 to the ground and cutting and removing an extra portion along the marking of the mounting port 15. It is assumed that the distal end portion is coated with cowling and is inserted again to connect the attachment port 15 to the connection hole 13a of the sewer main 13. Then, a filler such as cement milk is injected and fixed in the gap between the mounting port 15 of the last connected connecting pipe and the casing, and finally the casing for hole wall protection is pulled up,
The laying work is completed by filling the boring hole with earth and sand.

[0018]

As described above, according to the present invention, when the connecting pipe is connected to the sewer main, the core catch rod and the core provided on the rod are provided at the center of the connecting position of the connecting pipe of the sewer main. A first step of penetrating the catcher, a second step of excavating a peripheral portion of the penetrating portion to cut a circular core, and a third step of pulling the cut core to the ground by the core catch rod.
Since it consists of the above process and the fourth process of connecting and fixing the tip of the connecting pipe to the sewer main installation hole, artificial work in the sewer main is unnecessary, and especially the main Even if the pipe is bent or the diameter of the main pipe is relatively small, the core obtained by cutting off a part of the side wall of the sewer main pipe can be promptly collected on the ground, so there is no risk of sewage accumulation in the main pipe. ..

Further, the core tube is provided with a core catch rod having a drill bit at the tip in the direction of extension of the tip, coaxially with the core tube, and at least the sewer pipe from the tip of the core catch rod. Since the core catcher is installed at a distance equal to or more than the thickness of the pipe, when connecting the connecting pipe to the sewer main,
Not only the recovery of the core becomes easy, but also the workability is remarkably improved and various beneficial effects are exhibited.

[Brief description of drawings]

FIG. 1 is a side view of a core tube according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an essential part showing an embodiment of a core catcher formed on a core catch rod.

FIG. 3 is an enlarged sectional view of an essential part showing another embodiment of the core catcher formed on the core catch rod.

FIG. 4 is a cross-sectional view of a main part showing an excavation situation by a boring machine for a main sewer system.

FIG. 5 is a sectional view of an essential part showing the excavation state of a mounting pipe mounting hole for a sewer main.

FIG. 6 is a cross-sectional view showing a mounting state of a mounting pipe to a sewer main.

FIG. 7 is an enlarged cross-sectional view of a main part showing a marking work procedure for a mounting port of a mounting pipe in a sewer main pipe.

[Explanation of symbols]

 1 core tube 2 core tube head 3 core tube bit 4 core catch rod 5 core catch rod steady rest 6 drilling bit 7 core catcher 8 ground surface 9 boring machine 10 spindle 11 spindle rod 12 auger bit 13 sewer main 14 connecting pipe 15 Mounting port 16 Marking rod 17 Marking device C core

Claims (2)

[Claims] 1. A connecting pipe for a main sewer pipe when a boring machine is dug toward the main sewer pipe to excavate a mounting hole in the main sewer pipe, and the tip of the connecting pipe is connected and fixed to the mounting hole. A first step of penetrating the core catch rod and a core catcher provided on the rod at the center of the connecting position; a second step of excavating a peripheral portion of the penetrating portion to cut out a circular core; A method for connecting a sewer main to a sewer main, which comprises a third step of pulling the cut core to the ground by a catch rod and a fourth step of connecting and fixing the tip of the connection pipe to a sewer main mounting hole. 2. A core tube, which is attached to the tip of a spindle rod of a boring machine digging toward a sewer main, and has an annular metal crown at its tip, the core tube being provided in a direction of extension of the tip. A core catch rod having a drill bit at the tip is provided coaxially with the core tube, and the core catcher is attached at a distance of at least the thickness of the sewer main from the tip of the core catch rod. A core tube for connecting a connecting pipe to a sewer main, which is characterized in that