JPH02140390A - Device for executing hydraulic test and/or grouting in boring pit - Google Patents

Abstract

PURPOSE: To easily execute a hydraulic test and/or grouting by disposing a measuring device in a first supply duct, and expanding a closing sleeve provided around a rod by a second supply duct. CONSTITUTION: A boring tool 6 is installed on a lower end part of a line of rods, and a closing sleeve 8 is provided around one rod 7. A first supply duct 19 provided along the whole length of the rod line and communicated with the underside, and a second supply duct 20 for expanding the closing sleeve 8 are provided. In addition, a means to inject fluid into the first supply duct 19, and a means to measure a flow and a pressure of injected fluid are provided. By thus expanding the closing sleeve 8, a desired hydraulic test and/or grouting can be conducted without raising the rod line.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for carrying out hydraulic tests and/or grouting in a borehole.

<Prior art and the problem to be solved by the invention> In general, a hydraulic test in a borehole whose purpose is to determine the permeability of a section of soil is to isolate the section of the borehole that crosses this section, and then measure its flow rate. and consists of injecting water into it while measuring the pressure. This work is actually
Stop the boring at the bottom of the section you want to test, raise the boring rig, lower the injection pipe with the plugging device into the borehole, and insert the plugging device into the section you want to test. a test chamber between the closure device and the bottom of the borehole, into which water is injected via the injection tube and the flow rate and pressure are then read over time. This is achieved by

Such tests are therefore very time consuming, requiring complete re-elevation of the boring lot row and installation of injection tubes and closure devices. The deeper the borehole, the longer and more expensive these operations will be.

The same applies when it is desired to perform grouting while digging in the soil. After every grouting, the bowling rond row must be re-bounded.

SUMMARY OF THE INVENTION The present invention seeks to correct these shortcomings by providing a device that makes it possible to carry out hydraulic testing and/or grouting during excavation without the need to raise the boring equipment. purpose.

To this end, it is an object of the present invention to include a boring system having a row of ronds having a boning tool attached to the lower end thereof, one such rond having an inflatable closure sleeve surrounding it. The rondo row has a first supply duct throughout its length leading to its lower part and a second supply duct for inflation of the sleeve on a portion of its length above the occluding sleeve. l
- and includes means for injecting a fluid into the first duct and means for measuring the meteorite and pressure of the injected fluid. It is located in a device for performing hydraulic pressure testing and/or grouting in a mine.

If a rondo with a closing sleeve is placed on the tool scoop, it is only necessary to raise the rosol Iζ row by this height in order to define the height of the hydraulic test chamber. However, if it is known with certainty that there is a minimum height at this height, then all upper bounds can be avoided by placing the rond with the closure device at a distance from the tool equal to the minimum height of the tool. be able to. Even in this case, it is possible to obtain a greater chamber height by raising the rond row to some extent. Even when grouting is desired, it is possible to install a closure device at a certain distance from the tool. Then, the rods will be placed.

In any case, the first duct is used for replenishment of drilling fluid during boring, water replenishment during hydraulic testing and replenishment of grout during the grouting stage.

The other duct is only for inflation of the occluding sleeve.

These two ducts may be concentric, especially in the part of the rod row above the occluding sleeve.

In certain embodiments, spacers are placed on the rows of rods on either side of the rods with occluding sleeves.

The role of these spacers is to center the rod with the closure sleeve in the borehole in order to avoid premature wear of the closure sleeve due to friction on the borehole wall.

More specifically, these spacers, especially those fitted under rods with closure sleeves, are constructed with an expanding sleeve to smooth the bore wall before the sleeve passes through. Good too.

A particular embodiment of the invention will now be discussed, by way of non-limiting example, with reference to the accompanying drawings, in which: FIG.

Embodiment As shown in FIG. 1, this device combines its rotary drive on the one hand with the supply of drilling fluid from a pump 3 via a pipe connecting the pump to the boring head on the other hand. The boring system includes a row of rods suspended through a boring head 2 that allows the boring.

Furthermore, a clamp 5 is provided in a known manner, in particular to allow the addition of new rods during boring.

The rod 1 carries in its lower part a boring tool 6 adapted to the soil to be excavated, for example a "rotary" type tool such as a tricone or a tool with a cutter for soft soils, or alternatively a bottom hole for hard soils. It has a hammer or any other known drilling tool.

In its middle part, the rod row 1 has a rod 7 with an inflatable occluding sleeve 8 .

The pump 3 has a flow rate 10 of the fluid injected into the rod row 1.
and a measuring and recording device that makes it possible to measure and record the pressure 11.

This device 9 may in particular be integrated into a hauling parameter recording mechanism. In this case, this recording mechanism has two functional modes, i.e. the parameters to be measured are e.g. "Parameter recording" mode, where the parameters recorded are mainly the boring parameters of the bare metal, such as fluid injection volume and pressure, or reflected vibrations, back pressure exerted on the tool 6, boring time, etc.; and the parameters recorded are mainly rod row ``Hydraulic Test Record'' mode, which is the flow rate and pressure of water injected into the water. This integration of the device 9 in one boring parameter measuring arrangement provides the advantage that, thanks to the boring parameters, the boring stages requiring hydraulic testing or grouting can be determined in real time.

FIG. 2 shows an expansion sleeve I2 connected to the boring head 2, a certain number of rods 13 above the rods 7, and a trench-expanding sleeve 14 equipped with a trench-expanding cutter 15.
, a rod 7, a second drilling sleeve 16, a number of rotors F 17 below the rod 7 and a boring tool.

The elements of the rod row above rod 7 include two concentric ducts, a cylindrical central duct 19 and an annular duct 2o. The duct 19 is connected to the grouting duct 21 of the boring head and continues into the lower part of the rod row.
The level of tool 6 connects to the borehole.

On the contrary, the duct 20 is limited at the top by a row of rods. It is connected at its upper part via a push-pull type coupling to the level of the inflation sleeve 12, which is then connected via a pressure control device 25 with a gate valve 24 and a pressure gauge 26 to a pump 23. sell. The duct 20 connects at its lower part to the level of this rod 7 between the sleeve 8 and the rond door in a manner that allows expansion of the sleeve 8.

This sleeve 8 is arranged at its end over the circumference of the rod 7 to which it is fixed and is made of an elastic material which exhibits good resistance to friction. It is desirable that this be provided in a compatible manner.

If it is desired to carry out hydraulic testing or grouting during drilling, the tool 6 is fixed at the desired depth and the borehole is cleaned. Since the rod row I is fixed by the clamp 5, the closure sleeve 8 is expanded using the pump 23 via the annular duct 20. The inflation pressure is maintained and controlled by a control device 25.

Hydraulic testing or grouting can then be undertaken without the need to raise the rod array or lower the closure device. This test is carried out by injecting water into the part of the soil between the borehole bottom and the rod 7 using the pump 3 and the duct 19.

The water pressure test is carried out in stages similar to conventional tests, during which the pressure and flow measurements over time are recorded, digitized and stored in the device 9. .

Once the test is finished, it is only necessary to deflate the closure device 8 via the gate valve 24 and continue drilling.

The device according to the invention therefore allows considerable time savings compared to conventional soil investigation methods. It is also a valuable aid to the determination and interpretation of hydraulic tests since the results are readily available.

Naturally, various changes and modifications may be made to the above description without departing from the scope or spirit of the invention.

For example, in contrast to the embodiments described above, it is also possible to use a central duct for inflation of the closure device and an annular duct for grouting.

[Brief explanation of the drawing]

FIG. 1 is an overall view of the device according to the invention. FIG. 2 is an enlarged axial cross-sectional view of the rod row used in this device. Main component numbers I... Rod row, 2... Boring head, 3...
・Pump, 5... Clamp, 6... Boring tool, 7... Rod, 8... Closure sleeve, 9...
- Measuring device, 14.16... Isolation mechanism (sleeve for trench expansion), 19.20... Supply duct. Procedural amendment (method) 1 Indication of the case Patent Application No. 29717f of 1988 3 Apprehension Person Related to the case Applicant name Turetan 4, Agent 5 Date of amendment order March 7, 1999

Claims (6)

[Claims] (1) a boring system comprising a row of rods (1) to which a boring tool (6) is attached at the lower end thereof, one of such rods (7) having an inflatable closure A first sleeve (8) is provided throughout its length leading to the lower part of the rod row.
and a third supply duct (20) for inflation of the sleeve on a portion of its length above the occlusion sleeve; Hydraulic testing and/or testing in a borehole, characterized in that it comprises means (3) for injecting a fluid into a duct and means (9) for measuring the flow rate and pressure of the injected fluid. or equipment for grouting. 2. The device of claim 1, wherein the first and second ducts are concentric in a portion of the rod row above the closure sleeve. 3. Device according to claim 1, characterized in that the spacers (14, 16) are mounted on the row of rods on both sides of the rods provided with occluding sleeves. 4. The device of claim 3, wherein the spacing mechanism mounted from below the rod provided with at least the occlusion sleeve comprises a dilation sleeve. (5) In order to perform boring, a row of rods (1) with a boring tool (6) attached to the lower end thereof.
using a boring system having one of such rods.
(7) is surrounded by an inflatable occlusion sleeve (8).
, the rod row has a first supply duct (19) leading to its lower part over its entire length and a second supply duct (19) for inflating the sleeve over a part of its length above the occluding sleeve. interrupting the boring at the level at which it is desired to carry out the test and/or boring, injecting the fluid through the first duct into the chamber delimited by the closure device;
and a method for carrying out hydraulic testing and grouting in a borehole, characterized by measuring the flow rate and pressure of the injected fluid. 6. The method of claim 5, further comprising measuring boring parameters during the boring step.