JPH01146097A - Pipe propulsion device - Google Patents

Abstract

PURPOSE: To reduce compressive force to main pipes by providing, in addition to the main pipes, a propelling rod for propelling of large compressive strength inside the main pipes, and propelling the main pipes one by one by means of the propelling rod pipe. CONSTITUTION: This device comprises main pipes 3, a propulsion unit 4, a propelling rod pipe 5, push pipe jigs 6, and an excavating part 2. The excavating part 2 is press fitted into the wall of a vertical shaft and the main pipes 3 are connected to the excavating part after the excavating part has been advanced to some extent. Next, the plurality of push pipe jigs 6 provided around the propelling rod pipe 5 are aligned with the shoulders of the connections of the main pipes 3 to transmit the propelling forces of propelling rods to the main pipes 3, with the propelling rod pipe 5 pushed forward by the propulsion unit 4. Thereby the profitability of the main pipes 3 can be enhanced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention secures a continuous underground space without excavating from above the road, and efficiently installs communication cable conduits, water supply and sewerage pipes, gas pipes, etc. This relates to a pipe propulsion device for trenchless construction to be constructed under roads.

[Conventional technology]

FIG. 3 shows an example of a conventional tube propulsion device. In order to construct a pipe with this device, first build a shaft I, then install the propulsion device 4 in the shaft I, and attach the excavation part 2 to the wall of the shaft I.
Press in. After the excavation part 2 has entered the excavation part 2 to some extent, the main pipe 3 is connected to the excavation part 2 and pushed in by the propulsion device 4. When the main pipe 3 enters the ground, the next main pipe is connected and pushed further by the propulsion device 4. In this way, new main pipes are connected one after another and the main pipe is constructed underground. In addition, the excavation part 2 at the tip
There are various types of equipment, including a consolidation method that propels the earth without removing it, and a method that excavates and discharges the earth and sand using an auger.

[Problem that the invention seeks to solve]

In the prior art, large compressive forces act on the main pipe being constructed. That is, the resultant force of the resistance necessary for the excavation part at the tip of the main pipe to propel itself and the sliding friction force between the underground main pipe and the surrounding ground acts in the pipe axis direction. In particular, in the case of curved construction, the sliding friction between the main pipe and the surrounding ground increases, and
Since this frictional force is thought to increase in proportion to the construction distance, a very large propulsive force is required if long-distance and curved construction is to be carried out. Therefore, the main pipe to be constructed must have the compressive strength to withstand this extremely large propulsive force. The specific problems that arise due to this are listed below.

Once the 78 main pipe is constructed, it is sufficient to have enough strength to withstand the tonosho, but in order to satisfy the compressive strength required during construction, a pipe with a very large wall thickness is required.
It is uneconomical.

B. Huyum pipes lack compressive strength and are limited to short-distance construction. Attempting to perform curved construction will easily damage the main pipe connections.

In particular, sewage pipes require pipes with excellent corrosion resistance, and the use of plastic pipes is desired, but this has not been possible due to the lack of compressive strength.

Therefore, an object of the present invention is to provide a pipe propulsion device in which compressive force does not act on the main pipe during construction.

[Means for solving problems]

The main feature of the present invention is that, in addition to the main pipe, a propulsion rod pipe with high compressive strength for propulsion is provided inside the main pipe, and the main pipe is propelled one by one by this propulsion rod pipe. do. Of course, the propulsion rod pipe will only be used during construction and will be removed and collected after construction is complete.

[Effect]

In the present invention, each main pipe is pushed in by the propulsion rod pipe, so the frictional force between the main pipe and the surrounding ground is not cumulatively transmitted to the main pipe, but is cumulatively transmitted by the propulsion rod pipe. Therefore, the main pipe is not required to have excessive compressive strength.

〔Example〕

FIG. 1 is a diagram illustrating one embodiment of the present invention, and FIG. 2 is a diagram showing a cross section taken along line AA in FIG. 1. I is the shaft, 2 is the excavation part installed at the tip of the main pipe, 3 is the main pipe to secure space underground, 4 is the propulsion device located in the shaft to propel the propulsion rod pipe, 5 is the main pipe A propulsion rod tube located inside the tube for propelling the main tube, 6 a push tube jig for pushing the main tube, 7 a spring, and 8 a groove for interconnecting the propulsion rod tubes.

In the pipe propulsion device according to the present invention, the construction procedure is almost the same as the conventional construction method, but for each main pipe 3, a propulsion rod pipe is
A shaft is provided! Main pipe 3 and propulsion rod pipe 5
After the main pipe 3 has gone underground, the main pipe 3 under construction is
At the same time, the propulsion rod pipe 5 is also connected. To connect the propulsion rod pipe 5, it is sufficient to press the concave and convex grooves 8 together. However, the propulsive force of the propulsion rod pipe 5 is transmitted to the main pipe 3 by aligning the plurality of push pipe jigs 6 provided around the propulsion rod pipe 5 with the shoulders of the connection part of the main pipe 3. . Therefore, when connecting the main pipes 3 to each other, the push pipe jig 6 is made to enter the waste at the connecting portion of the main pipes 3. In this state, the propulsion device 4 moves the propulsion rod pipe 5
Just press . On the other hand, the connection method of the main pipe 3 may be welding, press-fitting, adhesion, etc. depending on the purpose, and O-rings or packing may be used as necessary. If the connection structure of the main pipes 3 is an expansion joint structure using an orig, etc., the compressive force between the main pipes 3 will not act, and the main pipes
The sliding friction force between the shaft and the surrounding ground is transmitted by the propulsion rod pipe 5. If the main pipe 3 is connected by welding, press-fitting, adhesion, etc., the compression force shared between the main pipe 3 and the propulsion rod pipe 5 will be as follows. Now, the Young's modulus of the main pipe 3 is E and the cross-sectional area A1, and the Young's modulus of the propulsion port and the main pipe 5 are E2,
If the cross-sectional area is A, the share of the main pipe 3 in the overall compressive force is EI AH/ (EI Al + J Al
) Tonashi, that of propulsion rod tube 5 is E! Ax/ (Et
A engineering + Ex A2). Therefore, EI At
<<If E, A, then the share of the main pipe 3 in the overall compressive force is very small, and the compressive force acting on the main pipe 3 is correspondingly small, so if the main pipe is thin or Main pipes made of materials with inferior strength can also be used.

After the excavation section 2 reaches the destination shaft (not shown), the propulsion rod pipe 5 becomes unnecessary, so a wire, etc. (not shown) is passed through the propulsion rod pipe 5, and the wire is used for propulsion. If you pull the rod pipe 5 back toward the shaft 1 (starting shaft),
The push tube jig 6 is only held by the spring 7, and the propulsion rod tube 5 can be moved rightward in FIG. 1, so it can be removed. After the propulsion rod pipe 5 is removed, it can of course be reused for other construction work.

〔Effect of the invention〕

As described above, in the present invention, the compressive force in the pipe axis direction that acts on the main pipe during construction can be shared with the propulsion rod pipe, so that the following effects are achieved.

The 71 main pipe only needs to have the strength to withstand the earth pressure that it will receive after construction, and it is economical because it does not require excessive wall pressure.

B. It can greatly contribute to long-distance and curved construction.

First, it becomes possible to use plastic pipes, which were previously difficult to use despite their excellent corrosion resistance.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of an embodiment that best represents the features of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a diagram showing a conventional pipe propulsion device for trenchless construction. FIG. 2... Excavation section, 3... Main pipe, 4... Propulsion device, 5...
...Propulsion rod tube.

Claims (1)

[Claims] A pipe propulsion device for a trenchless construction method that secures a continuous space underground without excavating from above the road, a main pipe for securing a space underground, an excavation part provided at the tip of the main pipe, and the above-mentioned A pipe propulsion device comprising a propulsion rod pipe located inside a main pipe for propelling the main pipe, and a propulsion device located in a shaft for propelling the propulsion rod pipe.