JPS5825142B2 - Laying method for attaching pipes to sewage mains - Google Patents

Description

[Detailed description of the invention] In sewer pipe installation work, when connecting an attachment pipe to the main pipe after laying the sewer main, conventionally, the part where the attachment pipe is to be laid is excavated from the ground and the attachment pipe is connected. Usually, it was based on the method of burying it.

However, since the location where the pipe with attached No. 1 is buried is generally in a part of the road, this construction method obstructs traffic as the road surface is dug up, and it is inconvenient that it requires time and effort to repair the road surface after burying. was there.

In view of the above points, this invention takes advantage of the fact that workers can enter the sewage main through a manhole, and allows workers to work inside the sewage main and the pit where the basin is placed, without having to excavate from the ground. This invention relates to a method for laying an attachment pipe whose purpose is to enable installation of an attachment pipe.

In this construction method, the location of the main sewage pipe is first determined based on the blueprint, the jet gun is set at an angle so as to point from inside the basin pit toward the planned location of the main pipe and the attached pipe, and the jet pump is activated. A high-pressure water stream is ejected from the tip of the jet gun, which tends to puncture the earth and sand.As the jet gun gradually penetrates into the ground, a pipe is connected to it, and the high-pressure water stream continues to perforate the main pipe wall. Create a path to reach the goal.

Once it reaches the main pipe, a hole is made in the pipe wall from the inside of the main pipe at that point, and a steel cable is passed through this leading path to connect to a hydraulic traction device with the end of the steel cable set on the pit side.

At the base end of the steel cable, the tip of a lead pipe is attached within the main pipe, and one end of the attachment pipe is attached to this lead pipe, and by the powerful traction action of the hydraulic pressure, the unit length, that is, one stroke row of the hydraulic traction device, is pulled out. The installation pipe is laid by towing it to the side and sequentially connecting the next blowing pipe after the installation pipe until it reaches the pit.The embodiment shown in the drawings will be described below.

The sewage main pipe 1 is generally buried at a depth of 3 m or more underground, and its inner diameter is approximately 800 m or more, so that workers can enter through the manhole.

The buried position of the main pipe 1 can be determined based on the design drawing, so by knowing the depth a1 from the ground and the distance from the sewage basin bit 2, the inclination of the installation pipe from the pit 2 to the main pipe 1 can be determined. The needle angle θ can be easily calculated.

Once the inclination angle θ is determined, the jet gun 3 is set at the angle θ from inside the pit 2, the jet pump 4 is activated, and a high-pressure water stream is jetted from the tip of the jet gun 3, and the jetted water jet penetrates the earth and sand.

As shown in FIG. 1, this jet gun 3 is connected to a jet pump 4 via a metal pipe (with a diameter of
Since it is made of three metal pipes connected together, high-pressure water jets (for example, 40 kg /
c. In (), the vibro gradually enters the ground after washing out the earth and sand in the area it hit, so when it reaches its base, connect a similar pipe to its rear end and continue to inject a high-pressure water stream. Operate and enter the vibro one by one.

This vibro connection is made by screwing or the like.

In this way, the work is continued until the tip of the vibro reaches the main pipe 1, and a leading path 7 from the pit 2 to the wall of the main pipe 1 is created.

Next, when the vibro of the jet gun 3 reaches the main pipe 1, a hole is made in the pipe wall from the inside of the main pipe 1 at the reaching point, but in order to know the reaching point from inside the main pipe 1. The vibro is slid back and forth along the leading path 7 in the pit 2,
If the tip of the pipe impacts the pipe wall of main pipe 1, the worker who has previously sneaked into main pipe 1 through the manhole will
Since it can be easily determined by listening to the impact sound, the location is marked and the pipe wall is drilled from the inside to form a hole 8 large enough to allow the lead pipe (described later) to pass through.

After the hole 8 is drilled, the vibro of the jet gun 3 is removed and the steel cable 9 is passed through the leading path 7.

Since the steel cable 9 can be passed through easily, once the steel cable 9 has been passed through, a lead pipe 10 is fixed to the end of the steel cable 9 within the main pipe 1, and a mounting pipe 11 is connected to the lead pipe 10.

The lead pipe 10 is made of metal and has a slightly larger diameter than the attachment tube 11 (for example, the outer diameter of the lead pipe is 200 mm, and the outer diameter of the attachment tube is 165 mm).

Since the tip of the lead pipe 10 has a conical shape, the connection with the steel cable 9 can be made securely by attaching a metal fitting 12 to the end of the steel cable, for example, by tightening a screw, to firmly grip the steel cable 9. The mounting tube 11 is also securely fixed using a suitable chuck or clamp type 13.

While working in the main pipe 1 in this way, a hydraulic traction device 14 is installed in the pit 2 on the ground, the steel cable 9 is fixed to it with a wire chuck 15, and once the preparation is completed, pressure oil is supplied from the hydraulic pump 16. is sent to the hydraulic traction device 14 to pull the steel cable 9 toward the ground.

Then, the lead pipe 10 enters the ground along the leading path 7, and the attachment pipe 11 is drawn in along the hole made by the lead pipe 10.

The hydraulic traction device 14 loosens the wire chuck 15 for each stroke, returns the hydraulic traction device 14, tightens the wire chuck 15 again at that position, operates the hydraulic traction device 14 again, and rewinds the steel cable 9 in sequence. When the attachment tube 11 is pulled in to a certain extent, the next attachment tube 11 is connected to its rear end.

Then, due to the entry of the lead pipe 10, the attachment pipe 11
Since the pipe gradually enters the ground along the leading path 7, the attachment pipe 11 can be laid from the main pipe 1 to the pit 2 by repeating these operations.

After the installation is completed, the joint between the hole 8 of the main pipe 1 and the attachment pipe 11 is filled with mortar or the like to close the area around the hole 8.

According to the results of a test conducted by the applicant in secret, 40t
using a hydraulic traction device with a traction force of 200 m in diameter.
With this lead pipe, we were able to pass a vinyl chloride mounting pipe with an outer diameter of 165 mm through clay soil with relatively poor geology.

In this case, the attachment tubes 11 could be joined together using a commercially available strong adhesive.

In this invention, the installation pipe 11 can be laid between the main pipe 1 and the pit 2 by the above-mentioned work, so there is no need to excavate from the ground surface, and therefore the road surface can be excavated to prevent traffic. It is extremely convenient because there is no risk of obstruction, and the construction method is relatively simple, making it an extremely effective construction method for installing attachment pipes to sewer mains.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the method of laying an attachment pipe for a sewage main pipe according to the present invention, and FIG. 1 is an explanatory diagram of a state in which a leading road is created from a pit using a jet gun. FIG. 2 is an explanatory diagram showing a state in which a steel cable is passed through a leading road, a lead pipe and an attachment pipe are attached to the steel cable, and the steel cable is towed by a hydraulic traction device. FIG. 3 is a plan view of the hydraulic traction device. FIG. 4 is a diagram showing a portion of the lead pipe. 1... Sewer main pipe, 2... Sewer pit, 3...
Jet gun, 4... Jet pump, 6... Pipe, 7... Leading road, 8... Hole, 9... Steel cable, 10
...Lead pipe, 11...Mounting pipe, 14...Hydraulic traction device.

Claims (1)

[Claims] 1 A construction method in which a jet gun is set at an angle to face the planned location of the sewage main and attachment pipes from inside the basin pit based on the design drawings, and a high-pressure water stream is sprayed from the tip of the jet gun to remove soil and sand. The process involves drilling a hole and connecting the pipes to a jet gun in order to create a path that continues to inject high-pressure water from the tip of the pipe to reach the wall of the main pipe. The process involves drilling a hole in the pipe wall and passing the steel cable through the lead path, and then fixing the tip of the lead pipe to the end of the steel cable inside the main pipe, connecting the mounting pipe to this lead pipe, and connecting the other end of the steel cable to the pit. The process of connecting to a hydraulic traction device set on the side, and pulling the steel cable unit length by unit length using the hydraulic pressure, gluing the next attachment pipe in order after the attached pipe, and gradually extending the attached pipe from the main pipe to the pit. A construction method for installing attachment pipes to sewage mains, which consists of combining the process of towing up to 100 ft.