JPH06280249A - Injection device for underground treatment - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to simplify a string removing operation. A jetting device for underground treatment according to the present invention comprises a string (1) consisting of rods or tubes (2) connected to each other and a string (1) mounted on the upper part of the string for rotating the rods or tubes and for straightening them if necessary. Device for driving the rod or tube (2) to move the same, at least one injection nozzle (4,5) mounted in the lower part of the string, and at least one high-pressure liquid source. The device for driving a string of rods or tubes, comprising a supply pipe (10, 12) connecting a supply of high pressure liquid to an injection nozzle, rotates the string in alternating forward and reverse directions to turn the supply source. The supply pipe connected to the injection nozzle is composed of a hose arranged outside the string.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in devices for treating the ground utilizing one or more rotary jets.

[0002]

BACKGROUND OF THE INVENTION Methods for treating the ground utilizing rotary jets are known and in the submerged soil masses,
It is used to form a reinforcing element that forms a ceiling screen shape or a pillar shape.

With this method, exogenous material or slurry is sprayed from the vertical holes toward the soil of interest by at least one jet directed in the appropriate direction and at a high velocity, the jet of soil Depending on the nature, it destroys the soil in its place on the jet trajectory, in which the slurry mixes with the composition of the soil and, after hardening, soil mortar or soil cement (in this case the soil is for example gravel). Soil or sandy soil) or simply replaced with soil in this destruction,
After setting, it becomes a hard slurry (the soil in this case consists of clay, for example). The one or more jets have a predetermined effective radius depending on the flow velocity, driving pressure and soil properties. If the device that creates the jet rotates / rotates slowly inside the upholstery, a treated soil consisting of some cylindrical volume is obtained, the upholstery of the jet under the conditions of interest. It has an effective radius and a height corresponding to the magnitude of linear movement.

Therefore, by utilizing such an injection technique,
A ceiling screen can be created by arranging in parallel a plurality of cylindrical elements (ie columns) of treated soil over a height, the ceiling screen being arranged in a mesh. Made from parallel upright holes, this close mesh of meshes allows the cylindrical elements or posts to intersect one another to form a continuous rigid body.

There are various types of jets utilized, such as a simple jet of slurry, a jet of slurry that is wrapped in an annular jet of air to increase the effective radius of the jet, and soil. In order to destroy the water, there is a combination of a jet of water surrounded by an annular jet of air and a separate jet of slurry at a position lower than the jet of water.

To achieve this method, in order to produce a cement slurry, one or more pumps connected via a rotary seal to the string introduced into the vertical holes that need to be injected, Devices with units for supplying the slurry are commonly used. The string of tubes is driven by rotating and linearly moving it through a hydraulic swivel head that surrounds the upper end of the string, which swivel head itself is attached to a drill jar. . One or more pumps at a pressure of 200-700 bar or higher, breaking liquid (slurry or water)
To supply.

The string of tubes consists of a connectable, unified tube length with a suitable sealing gasket, each tube length being a simple tube (simple jet) or several concentric tubes (two). Heavy or triple injection). In addition, liquid (slurry, water) is about 2-4m
Fired by one or more nozzles with a diameter of m.
The string of tubes has a diameter of about 50-200 mm.

Further, at the lower end of the string of tubes, below the nozzle, there is provided a boring device for creating an upright hole that requires treatment. As a modification, the vertical holes may be prefabricated by a separating device.

In practice, by positioning the injector at the bottom of the vertical hole and driving the string of tubes with linear movement and rotational movement towards the tip of the vertical hole,
The spraying process is started, after which pillars of a certain height made of treated soil are obtained. During this linear movement, the upper part of the string of tubes gradually enters the ground. This does not pose a problem under normal field conditions, for example when working in large spaces.

However, in order to fully lift the string of tubes during processing, it may be necessary to work in a condition where there is not enough space on the axis of the vertical hole (low ceiling or narrow working chamber). In this case, it is necessary to pull the upper tube out of the string and remove the tube during processing.

However, if the two or three supply ducts are defined by concentric tubes, such a removal operation is not desirable. This is because there is a risk that the slurry may enter the duct for carrying air or water and the injection nozzle may be damaged or clogged when the processing is restarted. Further, during such removal, it is necessary to stop the supply of the liquid, which may unfortunately cause the injected slurry to backflow or clog the nozzle.

Finally, strings of concentrically arranged tubes are also relatively expensive.

Therefore, when shortening the string of tubes, there is a need for an injection treatment device which can be operated in a space having a low ceiling and which does not interfere with the treatment.

There is also a need for an injector that does not use expensive concentric tubes.

[0015]

SUMMARY OF THE INVENTION In particular, the present invention relates to an injecting device for underground treatment, wherein a string of rods or tubes connected to each other and a string attached to the upper part of the string to connect the rods or tubes. A device for rotating and, if necessary, a linear movement, at least one injection nozzle mounted in the lower part of the string, at least one high-pressure liquid supply source, and the high-pressure liquid supply A supply pipe connecting a source to the injection nozzle, the device for driving the string of rods or tubes alternately rotating the string forward and reverse to connect the supply source to the injection nozzle. The supply pipe comprises a hose arranged outside the string.

The device according to the invention is usually equipped with one, two or three spray nozzles for the slurry, possibly with the addition of water spray nozzles. When applying two or three slurry jet nozzles, the jet nozzles are usually one to the other.
A phase angle of 80 ° (for two injection nozzles) or a phase angle of 120 ° (for three injection nozzles).

Each hose is distributed via a distributor to a single nozzle or several nozzles.

A rod or tube, for example, depending on whether the hose is fixed in a passage fixed to the string of rods or tubes or is inserted into the recess provided in the string of rods or tubes. It is unlikely that one or more hoses will be retained near or in contact with the outer surface of the string.

Apart from the hose, in the device of the present invention, the drive device is a string of rods or tubes,
It is characterized by alternating forward and reverse rotations and linear movement as required. The rotation angle in one direction and the other direction thereafter varies depending on the position, the number, and the type of the injection nozzle.

For a device with a single slurry injection nozzle, the angle of rotation is 360 ° in one direction (a complete revolution) and then 360 ° in the other direction. One to the other
For a device with two slurry injection nozzles oriented in the direction of 80 °, the rotation angle is 180 ° in one direction.
(Half turn), then 180 ° in the other direction. This is intended for all soils surrounding the wells to which the device of the invention is arranged and which are to be treated during alternating forward and reverse cycles.

For example, in special locations where obstacles are nearby, the angle of rotation may be deliberately limited without covering all the soil surrounding the upright.

With regard to the device according to the invention, the string of tubes is no longer used as a pipe for supplying liquid and has a mechanical function, namely alternating forward and reverse movements by means of a drive and possible linear movements. It has only the function of transmitting to the nozzle. For this reason, the string no longer needs to be hollow, and if desired, the string of hollow tubes may be replaced by a string of solid rods.

Also, for various reasons, if it is desired to shorten the string of rods or tubes, the upper length of the rod or tube should be sufficiently removed from the string when lifting the rod or tube, and such removal. The work can be done easily without disturbing the liquid supply. This is because the liquid is supplied by the hose. Therefore, the risk of clogging the injection nozzle is avoided.

In an optional but preferred embodiment, each hose is provided with a payout device which facilitates lowering and subsequently raising the injector of the present invention into the upright hole, thus It is possible to avoid hose scattering on the ground, which is considered dangerous due to the high pressure of the liquid to be conveyed.

The construction and operation of the injection apparatus of the present invention other than those described above are similar to those of the conventional injection apparatus and will not be described in detail.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the drawings. Figure 1 shows a string 1 consisting of basic tubes 2 connected together,
The lower part of this string 1 is fixed to an end element 3, which is equipped with two injection nozzles 4, 5 and a boring device 6.

The string 1 is a hydraulic swivel head 7
Can be driven to alternate forward and reverse rotations and / or linear movements, said swivel head 7 enclosing the upper end of the string 1 and itself from the tube 2. Attached to a jar 8 substantially parallel to the string 1. As shown in FIG. 1, the boring device 6 has a diameter larger than the diameter of the string 1 of tubes 2.
An annular free space is formed between the string 1 and the wall of the vertical hole 9 formed in the ground by the boring device 6. The injection nozzle 4 is connected to a high-pressure water supply source 11 via a hose 10 as a supply pipe, and the injection nozzle 5
Is connected to a supply source 13 of high-pressure curable slurry via a hose 12 as a supply pipe. As shown in the drawing, the feeding devices 14 and 15 used for the hoses 10 and 12, respectively, are arranged on the surface of the ground, and can feed and unwind the length of the hose as much as necessary, and It ensures that the hose does not cause a dangerous "flogging" if it is dragged on the ground and the fluid pressure changes abruptly.

Therefore, the string 1 consisting of the tube 2
Is no longer used as a pipe for liquids, and when raising the string 1 if necessary, the string 1 is shortened by removing the upper length of the tube 2 located above the swivel head 7. If you do, nothing is in the way.

[Brief description of drawings]

FIG. 1 is a schematic view showing an injection device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 string 2 tube 3 end element 4,5 injection device 6 boring device 7 swivel head 8 jar 9 standing hole 10,12 hose (supply pipe) 14,15 feeding device

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Jean-Claude Gussey France, 77680 Roisy-en-Brie, Liu Frederick Chopin 5 (72) Inventor Pierre Clement Men France, 92360 Mudon La Foret, Liu Alfred de Musée 4

Claims (2)

[Claims] 1. A string of rods or tubes interconnected to each other; a device mounted on an upper portion of the string for driving the rods or tubes to rotate and, if necessary, move linearly. At least one injection nozzle attached to the lower portion of the, at least one high-pressure liquid supply source, and a supply pipe connecting the high-pressure liquid supply source to the injection nozzle, from the rod or tube The device for driving the string comprises rotating the string alternately forward and reverse, and the supply pipe connecting the supply source to the injection nozzle comprises a hose arranged outside the string. A characteristic injection device for underground treatment. 2. The injecting device for underground treatment according to claim 1, further comprising a payout device associated with the hose.