JPH0131672Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a leading pipe for a propulsion method, and more particularly to a leading pipe in which a lubricant can be injected toward the outer periphery of a subsequent propulsion pipe.

The propulsion method involves pushing a pipe into the ground, and successively adding other pipes to the pushed pipe, and then pushing these pipes one after another to form a conduit. Therefore, a large frictional force acts between the outer periphery of each pipe and the soil, causing a loss in pushing force.In order to reduce this frictional force, a suitable lubricant (friction reducer) is applied to the pipes. It is customary to inject between the perimeter and the soil.

However, in the past, this lubricant was injected from the tip of the excavator, which often caused the lubricant to flow back into the machine from the cutting edge of the excavator, resulting in a lot of waste.

Therefore, the purpose of the present invention is to improve the efficiency of injection of the lubricant, and the present invention has a socket formed at one end, a socket at the other end, and a first protruding part provided on the outer periphery of the socket. A flange is connected to the rear end of the excavator, an exterior covering concrete is formed on the outer periphery of the pipe body, a second flange is formed on the outer periphery near the socket, and the first flange and the exterior are connected from the excavator to the outer periphery of the pipe body. A lubricant that penetrates the covering concrete and the second flange, has a rearward opening end behind the second flange, and allows the lubricant to be injected from the outer periphery of the socket toward the outer periphery of the subsequent propulsion pipe. The present invention provides a leading pipe for a propulsion method, characterized in that a supply pipe is provided.

Therefore, the lubricant is reliably injected from the rear of such a leading pipe, and the backflow of the lubricant into the inside of the excavator as described above can be prevented and the injection efficiency can be improved. It is.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In the drawing, 1 is an excavator for the propulsion method, and a cutting blade is provided on the left side of the drawing (not shown). 2 is a leading pipe connected to the rear end 5 of the excavator 1 by a flange 4 protruding from the outer periphery of the socket 3, and the socket 8 of the trailing propulsion pipe 7 is inserted into the socket 6; A flange 9 projecting from the outer periphery of the socket 8 of the trailing propulsion pipe 7 is fixed to the rear end of the socket 6 with bolts and nuts 10. 11 is an annular sealing material, 12 is a split ring divided into multiple parts in the circumferential direction or a single split ring, and 13 is a push ring divided into multiple parts in the circumferential direction. The sealing material 11 is compressed by the action of the push bolts 14 screwed onto positions at appropriate intervals in the circumferential direction of the push ring 13 and the connecting pins 15 attached to the push bolts 14. A seal is formed between the socket 6 and the insertion port 8 of the trailing propulsion pipe 7. Note that cement mortar lining layers 16 and 17 are formed on the inner surface of each tube 2 and 7 as necessary.

18 is a lubricant supply pipe. That is, 19 is a lubricant sheath disposed from the inside of the excavator 1 toward the rear end 5, and a flange 4 is provided at the tip of the lubricant sheath.
A connecting pipe 21 is attached that passes through a through hole 20 provided in the. The connecting pipe 21 has a rearward open end 24 that penetrates a flange 23 that is buried in the concrete 22 for exterior covering of the leading pipe 2 and protrudes near the socket 6, and is located behind the flange 23. A buried pipe 25 is connected within a space 26 provided behind the flange. 27 is a suitable pipe joint. Further, 28 is a check valve provided in the middle of the lubricant sheath 19, and 29 is a similarly provided check valve. In addition, through hole 2
0 are provided at multiple locations in the circumferential direction with the same pitch diameter as bolt holes for fixing the flange 4 and the rear end 5 of the excavator 1, for example, and a plurality of lubricant supply pipes 18 are also arranged accordingly. There is.

In the case of construction using the propulsion method in the above configuration, the pipe outer wall 2a near the socket 6 of the leading pipe 2
Then, a space 31 surrounded by the flange 23 and the soil 30 is formed, and the lubricant 32 is injected into this space 31 from the lubricant supply pipe 18. This lubricant 32 further flows between the outer periphery of the socket 6 of the leading pipe 2 and the soil 30, and subsequently flows between the trailing propulsion pipe 7 and the soil 30, making it effective. It has a friction-reducing effect. Further, according to the above configuration, the lubricant supply pipe 1
The lubricant 32 injected into the space 31 from 8 is reliably sent to the socket 6 and the outer periphery of the propulsion pipe 7, and there is no risk of it flowing back into the excavator 1 as in the conventional case, and the injection efficiency of the lubricant 32 is improved. It is possible to improve this.

As described above, according to the present invention, the lubricant can be injected from the open end of the lubricant supply pipe on the outer periphery near the socket formed at a distance from the excavator toward the outer periphery of the subsequent propulsion pipe. It is possible to prevent the backflow of lubricant into the inside of the excavator and reliably inject the lubricant to the outer periphery of the propulsion tube, which improves the lubricant injection efficiency and achieves the desired friction reduction with a small amount of lubricant. Not only can this effect be obtained, but even though the lubricant supply pipe is placed on the outer periphery of the pipe extending from the position of the excavator to the position near the socket, the first flange, the exterior covering concrete, and the second Since the lubricant supply pipe is disposed inside the flanges and passes through them, the lubricant supply pipe is prevented from being exposed outside the pipe and becoming a propulsion resistance, and propulsion can be performed with small power.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. 1...Excavation machine, 2...Leading pipe, 3...Inlet, 4
... flange, 6 ... socket, 7 ... trailing propulsion pipe,
18...Lubricant supply pipe, 23...Flange, 24...
...Open end, 32...Lubricant.

Claims (1)

[Scope of utility model registration request] A socket is formed at one end and a socket is formed at the other end, which is connected to the rear end of the excavator by a first flange protruding from the outer periphery of the socket. is formed, and a second flange is formed on the outer periphery near the socket, and the excavator passes through the first flange, the exterior covering concrete, and the second flange, and the second flange is formed on the outer periphery near the socket.
A tip for a propulsion method, characterized in that a lubricant supply pipe is disposed at the rear of the flange and has a rearward opening end and can inject lubricant from the outer periphery of the socket to the outer periphery of the subsequent propulsion pipe. conduit.