JPH0447241Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for pulling out buried pipes buried underground for wells, anchor work, landslide prevention, etc.

[Related technologies and their problems]

Conventionally, large hydraulic cylinder devices have been used for this type of extraction work, which has had the disadvantage that it is difficult to transport and install the large equipment, and the extraction work takes a long time.

Incidentally, with the recent progress in burying machines for buried pipes, the depth at which pipes are buried has become greater, and the reality is that the difficulty of pulling out the pipes has also increased accordingly.

[Purpose of invention]

The present invention was devised in view of the above circumstances, and its purpose is to provide a buried pipe pulling device that can be pulled out relatively quickly without requiring a large-sized device.

[Summary of the idea]

The buried pipe drawing device of the present invention includes a drawn pipe connected to the buried pipe, a head inserted into the end of the drawn pipe and having an engaging part in the drawing direction, and a head placed in the drawn pipe and applied to the head in the drawing direction. A casing that movably houses a hammer to apply the hammer, a supply path for supplying compressed air to move the hammer within the casing, and a protrusion that protrudes from the casing and is loosely inserted into a hole formed on the side of the drawn pipe. and a hanging member connected to this protrusion, and while the hanging member pulls the casing in the pulling direction, the hammer intermittently applies impact force to the head using the air pressure of compressed air supplied into the casing. In addition, the buried pipe connected to the drawn pipe can be pulled out.

[Example of idea]

In FIGS. 1, 2, and 3, 1 is a first drawn-out pipe connected to the end of a buried pipe 2 by a threaded part 3, and has a plurality of elongated holes 4 formed on its circumferential surface. .
Reference numeral 5 denotes a casing disposed within the drawn pipe 1, the lower end of which is sealed, and a protrusion 6 loosely inserted into the elongated hole 4 fixed to the circumferential surface. Reference numeral 7 denotes a second drawn tube connected to the end of the drawn tube 1 by a threaded part 3a, and a head 8 is inserted into the open end of the second drawn tube 7, and the inner periphery of the head 8 and the second drawn tube 7 are connected to each other. An engaging portion 9 in the drawing direction is formed with an inclination or step between the surface and the surface. Reference numeral 10 denotes a cylinder built into the casing 5, whose upper end is locked and sealed by a ring 11. A piston 12 is slidable within the cylinder 10, and a hammer 13 for applying an impact to the head 8 is integrally formed therein. 14 is a compressed air supply path that applies air pressure to the hammer 13 in the drawing direction, and the compressed air supplied from one of the protrusions 6 passes between the casing 5 and the cylinder 10 and is guided below the hammer 13. It is designed so that it can be
A cap 15 is connected to the lower end of the cylinder 10 by a screw portion 36, and has an air hole 16 formed therein. A check valve 17 is provided at the lower end of the cylinder 10, and is configured to be closed by a spring 18 when the supply of compressed air is stopped.
Reference numeral 19 is a tubular valve provided above the check valve 17, and is formed to be able to respond to fluctuations in air pressure. Reference numeral 20 denotes a hanging member such as a wire connected to the protrusion 6, and the casing 5 is always pulled upward by an appropriate pulling device. Therefore, in the usage state shown in FIG. 3, the hanging member 2
When compressed air of about 5 to 18 kg/cm ² is pumped into the air hammer device from the opening formed in one of the protrusions 6 while pulling the casing 5 upward by the casing 5, the compressed air is delivered to the lower end of the casing 5 through the supply path 14. As the pressure reaches the hammer 13, compressed air pressure is applied to the hammer 13 via the check valve 17 and the tubular valve 19, and impact force is intermittently applied to the hammer 13.
As shown in FIGS. 1 and 2, the hammer 13 strikes the head 8, and the striking force applied to the head 8 is applied to the drawn pipes 1 and 7 by the engaging part 9, and acts on the buried pipe 2 as a reverse striking pressure. There are things that are taken away. Note that the structure of the air hammer device may be selected as appropriate.

[Effect of idea]

As described above, the present invention is configured so that the pressure of compressed air is applied to the head by the hammer device as a reverse blowing action, so that deeply buried pipes can be easily and quickly pulled out simply by using a small compressed air supply device. It is now possible to remove it, and the effect is great.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views showing the operating state;
The figure is a usage state diagram. 1, 7...drawn pipe, 2...buried pipe, 4...hole,
5...Casing, 6...Protrusion, 8...Head,
9... Engaging portion, 13... Hammer, 14... Compressed air supply path, 20... Hanging member.

Claims (1)

[Scope of utility model registration request] A casing that movably incorporates a draw-out pipe connected to a buried pipe, a head inserted into the end of the draw-out pipe and having an engaging part in the pull-out direction, and a hammer placed in the draw-out pipe and applying an impact in the pull-out direction to the head. a supply path for supplying compressed air to move the hammer in the casing; a protrusion protruding from the casing and loosely inserted into a hole formed on the side of the drawing pipe; and a protrusion connected to the protrusion. and a hanging member,
A buried pipe drawing device characterized in that a blow is applied to a head with an air hammer while pulling a hanging member in a drawing direction.