JPS636718B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a propulsion method.

When a pipe is propelled underground using a hydraulic jack or the like, it must be constructed straight along the planned route, but deviation of the propulsion pipe cannot be avoided due to the soil quality and other surrounding conditions. Therefore, the deviation is checked using an appropriate measuring device, and the pipeline is corrected using a correction hydraulic jack installed between the leading pipe and the propulsion pipe connected to it. . However, conventionally, a normal propulsion tube that is much longer than its diameter is used as the propulsion tube that follows the leading tube, so the straightening hydraulic jack makes it difficult to connect the leading tube and the propulsion tube connected to it. Even if an angular displacement was applied between the two, it was difficult to correct the direction as intended. In other words, if the propulsion tube connected to the leading tube is long, there is a strong tendency for this propulsion tube to be propelled while maintaining its own axis. This is because the tendency to be propelled along the tunnel will be greatly reduced.

From this point of view, the present invention provides a propulsion method that allows easy direction correction, and one embodiment thereof will be described below with reference to the drawings.

In the figure, 1 is a leading pipe made of a cylindrical steel body, and a plurality of short propulsion pipes 2a, 2b... each having a length l shorter than the diameter are connected to the rear of the leading pipe 1. Ordinary propulsion tubes 3a, 3b, . . . having a length L longer than the diameter are connected.
The propulsion pipes 2a, 2b...3a, 3b... are made of ductile cast iron pipes, and their outer surfaces, except for the socket and insertion port, are lined with concrete to have the same outer diameter as the socket, and the adjacent propulsion pipes are The socket of one of the pipes is inserted into the socket of the other pipe, and they are connected to each other with bolts or the like, and are sealed from each other by an internal joint type pipe joint. These propulsion tubes 3
A main jack for propulsion (not shown) is arranged at the rear end of the guide tube 1 and the short propulsion tube 2a connected thereto. A straightening hydraulic jack 4 is interposed, the ends of which are fixed to fixed brackets on the leading pipe 1 and the propulsion pipe 2a, respectively.

Regarding the pipeline facilities, a short propulsion pipe 2a is connected immediately after the leading pipe 1, and a straightening hydraulic jack 4 is installed to propel the pipe by the main jack, and then short propulsion pipes 2b, 2c, etc. are sequentially installed. A pipeline of a predetermined length is formed by connecting and propelling a plurality of short propulsion tubes, and then sequentially connecting and propulsion tubes 3a, 3b, 3c, . . . of normal length. When it is detected that a deviation has occurred in the propulsion pipes 2a, 2b...3a, 3b... by the main jack, the correction hydraulic jack 4 is activated to correct the deviation.
is operated to deflect the direction of the leading pipe 1 with respect to the propulsion pipe 2a, and propulsion by the main jack is performed. Then, since the following propulsion tube 2a is short, it is easily propelled along the tunnel formed by the leading tube 1, and the following short propulsion tubes 2b,
2c... are also propelled along the tunnel formed by the leading tube 1 without resistance, so that the tunnel oriented by the leading tube 1 ends up being a plurality of short propulsion tubes 2a, 2.
b..., and therefore the normal propulsion tubes 3a, 3b... following these short propulsion tubes 2a, 2b... are also propelled along this tunnel without resistance. Thus, leading pipe 1
By correcting the direction of the propulsion pipe, the propulsion pipe can be easily corrected as intended.

According to the propulsion method of the present invention, as is clear from the above explanation, a plurality of propulsion tubes each having a length shorter than the diameter are arranged immediately after the leading tube, and the leading tube and the leading tube connected to the leading tube are A jack is interposed between the propulsion pipe and the propulsion pipes are connected to each other by a pipe joint for propulsion, so if the direction of the leading pipe is corrected by the jack, these short propulsion pipes can be connected to the pipe joint. They bend each other at the position of , and are propelled to follow the direction of the leading pipe without resistance, thus allowing for easy direction correction.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. 1...Leading pipe, 2...Propulsion pipe whose length is shorter than the diameter, 3...Propulsion pipe of normal length, 4...Hydraulic jack for correction.

Claims (1)

[Claims] 1. Immediately after the leading pipe, a plurality of propulsion pipes with a length shorter than the diameter are arranged, and a plurality of jacks are interposed in the circumferential direction of the pipes between the leading pipe and the foremost propulsion pipe connected to it. A propulsion method characterized in that the propulsion pipes are connected to each other by pipe joints for propulsion, and a propulsion pipe of normal length is connected behind the propulsion pipes for propulsion.