SU1204684A1 - Arrangement for trenchless laying of pipelines under interfering objects - Google Patents

Description

one

The invention relates to the mining and construction industry and can be used for trenchless laying of underground utilities.

The purpose of the invention is to increase the reliability of operation due to the tension stitching in the sections of the drill pipe.

The drawing shows devices for trenchless laying of pipelines under obstacles, a general view in section; in fig. 2 — node I in FIG. 1 (in an enlarged view).

The device consists of a string of drill pipes 1, located in the pilot well and connected to an expanding expander 2, which is connected through spindle 3 to a pneumatic piston 4 having a sliding seal 5 in the bottoms 6 of the column 7 of the casing. Inside column 7 there is a separation plug 8, which has a valve 9, a stopper cuff 10 and a drain valve 11. At the end of the casing string 7, a shoe 12 with seals 3 is fitted, which fit the casing 7 and the guide cylinder 14, rigidly fastened to the stop 15, through which the air duct 16 passes; The stop 15 is fixed on the guides 17 of the frame 18 and can move as the casing 7 is expanded. The inlet valve is associated with a tiepe3 lever 19 with a cable 20.

The device works as follows.

After the pilot hole 21 has been drilled, an expander 2 is attached to the string of drill pipes 1, to which the casing string 7 is connected via spindle 3 and pneumatic piston 4. Introduce columns 7, install a separating plug 8, pull the cable 20 from the drain valve 11 through the stop 15. On the free end of the casing 7, install the shoe 12 on which: guide cylinder 14 is mounted with the stop 15, then the stop 15 is fixed to the guides 17 of the frame 18. After this, the string of drill pipes 1 transmits a torque and pulling force generated by any known method to the expander 2, through which 0404684 is pumped

The active agent, which enters the expander 2, passes through its industrial openings and takes the surface of the ps through the annular space 22. Then, through the air duct 16, air is supplied under pressure through the valve 9 into the closed cavity, which is bounded by the walls of the casing.

 About the pipes, the bottom 6 and the separation plug B, and due to the pressure on the bottom 6, the casing string 7 begins to be inserted into the expanding well, and the pneumatic piston 4 through

 5 spindle 3 creates an axial load on the expander 2,

As the well 21 expands, the casing string 7 advances the length of the guide cylinder 14. During this process, the stop cuff 10 is pressed against the string 7 due to the high pressure in the cavity of the cuff 0, which, when the valve 9 is open, is in communication with the high pressure area. After stopping the supply of high pressure through the air line 16, valve 9 cuts off the cavity of the cuff 10, leaving it on the casing string under high KIM pressure. Then, the directional cylinder 14 together with the stop 15 is displaced to the right along the guides 17, the shoe 12 is removed and the column 7 of the casing is boosted by welding the secondary pipe. After that, the entire rig is reassembled - LYaYuTsII cylinder 14 with emphasis 15

4Q and fasten the anvil 15 to the guides 17 of the frame 18). The cable 20 opens the drain valve 11, while loosening the locking cuff 10 against the walls of the column 7.

45 casing pipes, and a separating plug 8 from the pressure in the cavity of the casing string 7 is shifted to the right up to the stop in the shoe I2. Then the drain valve 1 is closed again.

The iQ feeds high-pressure air through the air duct 16 through valve 9 into the closed cavity of the casing string 7 and the process of laying the casing 7 of the casing into the expansion pilot well continues. During the build-up period, 1 casing, the expansion of the pilot well does not stop.

Editor T. Parfenova

Compiled by S.Robaten

Tehred O. Niece Proofreader L. Patay

Order 8497/28 Circulation 648 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

FIG. 2

Claims (1)

DEVICE FOR TOWLESS TILE PIPELINES UNDER OBSTACLES, comprising a bed, a drill pipe string with an expander connected through a spindle to a casing string, in which a pneumatic piston and a separation plug with valves are placed to prevent increase the reliability of work by reducing tensile forces in the sections of the drill pipe string, the device is equipped with a locking device in the form of an end shoe with seals and a guide cylinder, and the end Assaka covers the column end casing inside the guide cylinder which is fixed to _a frame. S SU., .. 1204684 f