CA1180632A - Device for the repeated injection of grout material in liquid state into a volume to be treated - Google Patents
Device for the repeated injection of grout material in liquid state into a volume to be treatedInfo
- Publication number
- CA1180632A CA1180632A CA000329621A CA329621A CA1180632A CA 1180632 A CA1180632 A CA 1180632A CA 000329621 A CA000329621 A CA 000329621A CA 329621 A CA329621 A CA 329621A CA 1180632 A CA1180632 A CA 1180632A
- Authority
- CA
- Canada
- Prior art keywords
- valving means
- tubing
- pressure
- treated
- volume
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
ABSTRACT OF THE DISCLOSURE:
A device for the repeated injection of liquids into a volume to be treated comprises piping in which is provided a valving construction that opens to the volume to be treated only when the pressure of the liquid in the piping exceeds a given value. In one embodiment the valving construction comprises a perforated tubular body surrounded by a sleeve of resiliently flexible material.
A device for the repeated injection of liquids into a volume to be treated comprises piping in which is provided a valving construction that opens to the volume to be treated only when the pressure of the liquid in the piping exceeds a given value. In one embodiment the valving construction comprises a perforated tubular body surrounded by a sleeve of resiliently flexible material.
Description
This inven-tion :relates to pu~lic works or similar operations in the private sec-tor.
The main oblec-t is to produce a device which makes it possible to pass a settable -fluid product, such as a grout material that may be cement grou-t, under a prede-termined pressure~ as often as desired, at any intervals of time, into a space or void which .i.s not di.rectly access.ible, such as the annular space between a plece oE tubln~ and a drllled hole, the earth foundatlons a:E a construction, etc~ In other words, such injections of grout ma-terlal in the llquld state are made at locations where it ls usually expected that voids will develop in or about such cons-truction works. The device of the invention may be i.nstalled during the constructlon of a work which is known to eventually have -to be treated, or installed by drilling or boring.
Hitherto, such injections have been carried out by means of a simple plunger tube, possibly provided with a non-return valve, which generally only enables a single treatment to be carried out since the setting of the product clogs up the pipes when a settable product is being used unless the product is driven out by water or slurry. This can be disadvantageous since the liquid used for driving out then flows into -the volume to be treated and can disrupt the product put in place.
,,,, ~
.`~3 - 1- ~
3~
Such injections have also been carried out by means of a device wlt~ a double shutter fixed at the end of a more or less rigid in~ectio~ tube, which requires: straight pipes in whlch the double shutter can slide; a pipe diameter which is large enough to protect both an injection tube with sufficient section, -taking into account the desi~ed flowt and any other tubing necessary for the operatiol~ o;~ the device with the double shutter; the performance of operations which are oEten delica-te, with risk of the device with the double shutter becomin~ jammed in the pipe; and surface equipment which is often substantial, comprising, for example, a hoist.
Furthermore, the pressure at injection level cannot be controlled unless additional costly equipment is used, because of the uncertainty of the amount of pressure lost in the pipes.
There is accordingly claimed herein essentially a device allowing the repeated injection of a grout material in liquid state into a volume to be treated, comprising valving means, pumping means for pumping the grout material to said valving means through a first tubing element, and a valve device for varying the pressure in a second tubing element con-nected downstream of said valving means, said valving means being constructed to open to the volume to be treated only when the pressure of the grout material e~ceeds a given minimum value.
These tubing elements or pipes can have a small diameter and may be flexible or ri~id, and can allow any course determined by the limitations of the position and obstructions on ~063~ 1 the site.
The pipes can be ~ashed, without unwanted liquids passing into the volume to be -treated, by using a washlng pressure which is insuf~icient to open the shutter.
It is therefore possible to repeat the operation as many times as desired, even after several hours or several years, without having to use heavy equipment (such as a hoist) but simply some flexible tubing.
The following description, which refers to the attached drawings given as non-limiting examples, explains how the invention is put into practice.
In the drawings:
Figure 1 is a diagrammatic view of a simple embodiment of the device which is the subject of the invention.
Figures 2 to 10 sho~ diagrammatically some applications of the invention as follows:
For cementing a post or tube (Figures 2 and 3);
For treatment ~mder a dam (Figure 4);
For underpinning beneath foundations (Figure 5);
For work on a tunnel (Figure 6);
For repairing the joints of a retaining wall (Figure 7); and For various operations relating to marine platforms (Figures 8 to 10), In the embodiment shown in Figure 19 the device I
~ 3 essen-tially comprises: a tubing element 1, for example a U-tube, although its precise shape does no-t effect its efficiency when it is placed at the level of the volume to be -treated; and a v~lving means ~ on ~he element l, which opens under pressure and can either connect the interior of the elemen-t 1 -to -the ex-terior space (open position, under pressure), or allow the liquid to flow through -the element 1 as through a normal tube (closed posi-tion, low pressure). This means 2 may comprise, for example, a sleeve 20 made of rubber or similar resilien-tly flexible material fixed to the outside of the tube 1, placed around -the latter at the desired tension and covering a part of the tube which has holes 10 drilled in it. If the downstream circui-t is closed, the pressuris-ation of the liquid in the tube 1 dilates the sleeve andthe liquid flows ou-t. If, on the other hand9 the down-stream circuit is open and the flow is weak, the sleeve remains flat against the tube, and the liquid flows into the tube 1 to escape through the downstream circuit. It should be noted that this type of means 2 allows the downstream and upstream circuits to be reversed.
The element 1 is connected to the working area by two pipes which can be flexible or rigid and comprising a downstream pipe 3, and an upstream pipe 4 connected to a unit 5 for pumping the trea-tment liquid.
In the pipe 3, in the working area there are provided a device 6 for indicating the pressure (for example a manometer) and a valve device such as a tap 7 A manometer ~, or any other device for measuring pressure, Gan also be provided in the pipe 4, for example at the outlet of the pumping unit.
The pipes can be put in position in varlous ways, some examples of which are given in the following paragraphs.
Before each operation 9 the pipes are washed by passing the washing liquid (wa-ter or slurry, for example) -through the upstream pipe 4 under low pressure, the tap 7 being open and the valving means 2 remaining closed.
After washing, the tap 7 is closed and pressure is increased, which opens the means 2 and allows the functioning of -the device to be checked before starting the injection. The upstream flow is immediately stopped and the tap 7 opened, so as to decrease the pressure in the pipes 9 which has the effect of making the means 2 close again. Thus the washing liquid does no-t flow into the volume to be treated.
The tap 7 is kept open and the washing liquid is driven out at low pressure (so as not to open the valving means 2) by the treatment liquid, ~hen the treatment liquid reaches the means 2, which is determined by knowing the volume of the pipes and the volume despatched by means of a flow measuring instrument a-t the pump or measurement at the ou-tlet of the tap 7), this tap is closed, the pressure increases, the means 2 opens and the treatment liquid flows into the volu~eto be treated.
At the end of the operation, the pipes are washed agaln r still without pollu-tin~ the treated volume.
The same operation can be performed as many times as desired, that is if a void de~elops again after a first injection in the -treated zone~ It is then sufficient to inject grout material at a pressure sufficient to cause burs-ting of the previous grout ~aterial that may have se-t around the valving means. This is possible since, by defillition, a void has developed in the valving means area.
The knowled~e o the upper and lower pressures makes 10 it possible to know the exac-t pressure in the pipe at the level ~f the injection point' if this control is not required, the devices 6 and 8 can be omit-ted.
The precise choice of technological components does not effect the principle of operation of the system.
It is, of course, possible to have as many double pipe systems plus valving means as injection levels. However, it can be advantageous in certain cases to limit -the number of pipes.
Below each valving means 2, a non-return valve can 20 be placed which opens at very low pressure, slightly less than that at which the means 2 open, and thus connects several return pipes, as is shown as an example in Figure 2, where the pipe 4 is connected to two branches or first tubing elements ~a and 4b which respectively feed elements la and lb whose return pipes or second tubing elements 3a and 3b are fitted with respective non-re-turn valves 9a and 9b placed upstream of their connection to the common re-turn pipe 3.
The invention is capable of use in numerous applica-tions, some non-limiting examples of which are given below.
For cementing a post or metal tubing into a ~d ~1~)632 drilled hole 11 (Figures 2 and 3) 9 -the device can be fixed on to the -tubing 12 before the tubing is lowered, the pipes being placed on the inside or outside of -the tubing, -the valve or valves 2 being on the outside of the tubing.
I-t is also possible for the plpes to be extendeà
into the annular space which surrounds -the tubing or post, or into a hole drilled for this purpose, before or after the positioning of the -tubing or post.
It is thus possible to fill the annular space with cement, as shown at 1 in Figure 3, to complete the contact between the base of the post and the ground surrounding it, and/or to inject the product into the latter so as to obtain a good quality of cement around the post and a reinforcement with the same geotechnical characteristics as the earth, or to treat a particular layer with any product.
This makes it possible in particular to under-prop concrete posts which are too short (Figure 3, case II), or to treat a layer of earth, for e~ample near to a foundation post (Figure 3, case III).
In the case of a dam 13, by using the device according to the inven-tion -the dam can be secured to the ground 14, as shown at IV in Figure 4, by using the unit 1, 2 under the barrage, or an impervious screen can be formed or reinforced under the dam~ as shown at ~ also in Figure 4.
Figure 5 shows how underpinning beneath the foundations of a struc-ture l~ can be carrled out, either by inserting the device into a hole 15 drilled and imperviously sealed in 16 around the pipes 3 and 4, or by installing the device before constructing the foundations, as shown at VI.
Regarding the impervious sealing at 16, it is obvious that it can be achieved in any manner known to the man of -the art.
One can imagine a plu~ made oE cement or yet an inflatable shutter but it is obvious that none of tl~ese solutions are actually limitative to the present invention and do not Eo.rm part of the present invention since, in any event, the same sealing problem was present in the prior art devices~
Figure 6 illustrates the use of the device according to the invention to the adherence of the arch 16 of a tunnel, where the devices l, 2 are for eventual use, placed behind the arch before it is concreted so as to simply ensure adherence (VII) or also that cracked areas are treated (VIII).
The invention can also be applied to the repairing of joints in a retaining wall 18 or in a similar type o~ wall (Figure 7), of a dam, etc., -the device being positioned before the wall is construct~d or before the bank is filled up.
The invention also makes it possible to obtain a distribution of pressure (Figure 8) so as to avoid deformation of the base 19, Eor example in a metal marine structure 23 (IX) in Fi~ure 8, or to counteract e~cessive sinking, whether differential or not (X on the same Figure).
The inventlon can also be used for dislodging a structurc, for example i.n recoverin~ gravity platforms 21, that is platforms resting on the sea bed (Figure 9), by injecting a liquid under pressure underneath the said structure at one or several points, if possible appropriately dis-tribruted points under the structure, between the structure and the bed on which it rests.
It is also possible to strai~hte~ a structure, for example a marine platEor~l 21, by maklng injectlons ùnder pressure into one or several sections defined hy projections 22 beneath the struc-ture, as shown in Figure 10~
In e~ery case, the pipes can be pvsitioned, for eventual use, by following any rou-te (before construction, before rapairin~r etc) or they can be installed in a hole drilled just before treatment, the upper par-t oE this hole being blocked up by concretin~ or by the first injection.
It goes withou-t saying that the described embodiments are given only by way of example and that they could be modified, in particular by substi-tuting equivalent techniques, without exceeding -the limitations of this invention.
_ 9 _ .~ ~
The main oblec-t is to produce a device which makes it possible to pass a settable -fluid product, such as a grout material that may be cement grou-t, under a prede-termined pressure~ as often as desired, at any intervals of time, into a space or void which .i.s not di.rectly access.ible, such as the annular space between a plece oE tubln~ and a drllled hole, the earth foundatlons a:E a construction, etc~ In other words, such injections of grout ma-terlal in the llquld state are made at locations where it ls usually expected that voids will develop in or about such cons-truction works. The device of the invention may be i.nstalled during the constructlon of a work which is known to eventually have -to be treated, or installed by drilling or boring.
Hitherto, such injections have been carried out by means of a simple plunger tube, possibly provided with a non-return valve, which generally only enables a single treatment to be carried out since the setting of the product clogs up the pipes when a settable product is being used unless the product is driven out by water or slurry. This can be disadvantageous since the liquid used for driving out then flows into -the volume to be treated and can disrupt the product put in place.
,,,, ~
.`~3 - 1- ~
3~
Such injections have also been carried out by means of a device wlt~ a double shutter fixed at the end of a more or less rigid in~ectio~ tube, which requires: straight pipes in whlch the double shutter can slide; a pipe diameter which is large enough to protect both an injection tube with sufficient section, -taking into account the desi~ed flowt and any other tubing necessary for the operatiol~ o;~ the device with the double shutter; the performance of operations which are oEten delica-te, with risk of the device with the double shutter becomin~ jammed in the pipe; and surface equipment which is often substantial, comprising, for example, a hoist.
Furthermore, the pressure at injection level cannot be controlled unless additional costly equipment is used, because of the uncertainty of the amount of pressure lost in the pipes.
There is accordingly claimed herein essentially a device allowing the repeated injection of a grout material in liquid state into a volume to be treated, comprising valving means, pumping means for pumping the grout material to said valving means through a first tubing element, and a valve device for varying the pressure in a second tubing element con-nected downstream of said valving means, said valving means being constructed to open to the volume to be treated only when the pressure of the grout material e~ceeds a given minimum value.
These tubing elements or pipes can have a small diameter and may be flexible or ri~id, and can allow any course determined by the limitations of the position and obstructions on ~063~ 1 the site.
The pipes can be ~ashed, without unwanted liquids passing into the volume to be -treated, by using a washlng pressure which is insuf~icient to open the shutter.
It is therefore possible to repeat the operation as many times as desired, even after several hours or several years, without having to use heavy equipment (such as a hoist) but simply some flexible tubing.
The following description, which refers to the attached drawings given as non-limiting examples, explains how the invention is put into practice.
In the drawings:
Figure 1 is a diagrammatic view of a simple embodiment of the device which is the subject of the invention.
Figures 2 to 10 sho~ diagrammatically some applications of the invention as follows:
For cementing a post or tube (Figures 2 and 3);
For treatment ~mder a dam (Figure 4);
For underpinning beneath foundations (Figure 5);
For work on a tunnel (Figure 6);
For repairing the joints of a retaining wall (Figure 7); and For various operations relating to marine platforms (Figures 8 to 10), In the embodiment shown in Figure 19 the device I
~ 3 essen-tially comprises: a tubing element 1, for example a U-tube, although its precise shape does no-t effect its efficiency when it is placed at the level of the volume to be -treated; and a v~lving means ~ on ~he element l, which opens under pressure and can either connect the interior of the elemen-t 1 -to -the ex-terior space (open position, under pressure), or allow the liquid to flow through -the element 1 as through a normal tube (closed posi-tion, low pressure). This means 2 may comprise, for example, a sleeve 20 made of rubber or similar resilien-tly flexible material fixed to the outside of the tube 1, placed around -the latter at the desired tension and covering a part of the tube which has holes 10 drilled in it. If the downstream circui-t is closed, the pressuris-ation of the liquid in the tube 1 dilates the sleeve andthe liquid flows ou-t. If, on the other hand9 the down-stream circuit is open and the flow is weak, the sleeve remains flat against the tube, and the liquid flows into the tube 1 to escape through the downstream circuit. It should be noted that this type of means 2 allows the downstream and upstream circuits to be reversed.
The element 1 is connected to the working area by two pipes which can be flexible or rigid and comprising a downstream pipe 3, and an upstream pipe 4 connected to a unit 5 for pumping the trea-tment liquid.
In the pipe 3, in the working area there are provided a device 6 for indicating the pressure (for example a manometer) and a valve device such as a tap 7 A manometer ~, or any other device for measuring pressure, Gan also be provided in the pipe 4, for example at the outlet of the pumping unit.
The pipes can be put in position in varlous ways, some examples of which are given in the following paragraphs.
Before each operation 9 the pipes are washed by passing the washing liquid (wa-ter or slurry, for example) -through the upstream pipe 4 under low pressure, the tap 7 being open and the valving means 2 remaining closed.
After washing, the tap 7 is closed and pressure is increased, which opens the means 2 and allows the functioning of -the device to be checked before starting the injection. The upstream flow is immediately stopped and the tap 7 opened, so as to decrease the pressure in the pipes 9 which has the effect of making the means 2 close again. Thus the washing liquid does no-t flow into the volume to be treated.
The tap 7 is kept open and the washing liquid is driven out at low pressure (so as not to open the valving means 2) by the treatment liquid, ~hen the treatment liquid reaches the means 2, which is determined by knowing the volume of the pipes and the volume despatched by means of a flow measuring instrument a-t the pump or measurement at the ou-tlet of the tap 7), this tap is closed, the pressure increases, the means 2 opens and the treatment liquid flows into the volu~eto be treated.
At the end of the operation, the pipes are washed agaln r still without pollu-tin~ the treated volume.
The same operation can be performed as many times as desired, that is if a void de~elops again after a first injection in the -treated zone~ It is then sufficient to inject grout material at a pressure sufficient to cause burs-ting of the previous grout ~aterial that may have se-t around the valving means. This is possible since, by defillition, a void has developed in the valving means area.
The knowled~e o the upper and lower pressures makes 10 it possible to know the exac-t pressure in the pipe at the level ~f the injection point' if this control is not required, the devices 6 and 8 can be omit-ted.
The precise choice of technological components does not effect the principle of operation of the system.
It is, of course, possible to have as many double pipe systems plus valving means as injection levels. However, it can be advantageous in certain cases to limit -the number of pipes.
Below each valving means 2, a non-return valve can 20 be placed which opens at very low pressure, slightly less than that at which the means 2 open, and thus connects several return pipes, as is shown as an example in Figure 2, where the pipe 4 is connected to two branches or first tubing elements ~a and 4b which respectively feed elements la and lb whose return pipes or second tubing elements 3a and 3b are fitted with respective non-re-turn valves 9a and 9b placed upstream of their connection to the common re-turn pipe 3.
The invention is capable of use in numerous applica-tions, some non-limiting examples of which are given below.
For cementing a post or metal tubing into a ~d ~1~)632 drilled hole 11 (Figures 2 and 3) 9 -the device can be fixed on to the -tubing 12 before the tubing is lowered, the pipes being placed on the inside or outside of -the tubing, -the valve or valves 2 being on the outside of the tubing.
I-t is also possible for the plpes to be extendeà
into the annular space which surrounds -the tubing or post, or into a hole drilled for this purpose, before or after the positioning of the -tubing or post.
It is thus possible to fill the annular space with cement, as shown at 1 in Figure 3, to complete the contact between the base of the post and the ground surrounding it, and/or to inject the product into the latter so as to obtain a good quality of cement around the post and a reinforcement with the same geotechnical characteristics as the earth, or to treat a particular layer with any product.
This makes it possible in particular to under-prop concrete posts which are too short (Figure 3, case II), or to treat a layer of earth, for e~ample near to a foundation post (Figure 3, case III).
In the case of a dam 13, by using the device according to the inven-tion -the dam can be secured to the ground 14, as shown at IV in Figure 4, by using the unit 1, 2 under the barrage, or an impervious screen can be formed or reinforced under the dam~ as shown at ~ also in Figure 4.
Figure 5 shows how underpinning beneath the foundations of a struc-ture l~ can be carrled out, either by inserting the device into a hole 15 drilled and imperviously sealed in 16 around the pipes 3 and 4, or by installing the device before constructing the foundations, as shown at VI.
Regarding the impervious sealing at 16, it is obvious that it can be achieved in any manner known to the man of -the art.
One can imagine a plu~ made oE cement or yet an inflatable shutter but it is obvious that none of tl~ese solutions are actually limitative to the present invention and do not Eo.rm part of the present invention since, in any event, the same sealing problem was present in the prior art devices~
Figure 6 illustrates the use of the device according to the invention to the adherence of the arch 16 of a tunnel, where the devices l, 2 are for eventual use, placed behind the arch before it is concreted so as to simply ensure adherence (VII) or also that cracked areas are treated (VIII).
The invention can also be applied to the repairing of joints in a retaining wall 18 or in a similar type o~ wall (Figure 7), of a dam, etc., -the device being positioned before the wall is construct~d or before the bank is filled up.
The invention also makes it possible to obtain a distribution of pressure (Figure 8) so as to avoid deformation of the base 19, Eor example in a metal marine structure 23 (IX) in Fi~ure 8, or to counteract e~cessive sinking, whether differential or not (X on the same Figure).
The inventlon can also be used for dislodging a structurc, for example i.n recoverin~ gravity platforms 21, that is platforms resting on the sea bed (Figure 9), by injecting a liquid under pressure underneath the said structure at one or several points, if possible appropriately dis-tribruted points under the structure, between the structure and the bed on which it rests.
It is also possible to strai~hte~ a structure, for example a marine platEor~l 21, by maklng injectlons ùnder pressure into one or several sections defined hy projections 22 beneath the struc-ture, as shown in Figure 10~
In e~ery case, the pipes can be pvsitioned, for eventual use, by following any rou-te (before construction, before rapairin~r etc) or they can be installed in a hole drilled just before treatment, the upper par-t oE this hole being blocked up by concretin~ or by the first injection.
It goes withou-t saying that the described embodiments are given only by way of example and that they could be modified, in particular by substi-tuting equivalent techniques, without exceeding -the limitations of this invention.
_ 9 _ .~ ~
Claims (8)
1. A device allowing the repeated injection of grout material in liquid state into a volume to be treated, comprising valving means, pumping means for pumping the grout material to said valving means through a first tubing element, and a valve device for varying the pressure in a second tubing element con-nected downstream of said valving means, said valving means being constructed to open to the volume to be treated only when the pressure of the grout material exceeds a given minimum value.
2. A device according to claim 1, wherein the valving means comprises a perforated tubular body surrounded by a sleeve made of resiliently flexible material.
3. A device according to claim 1, comprising several valving means each connected through a first tubing element to said pumping means and through a second tubing element to a common return pipe which, in turn, is connected to said valve device; further comprising non-return valves each on said second tubing elements, said non-return valves opening under a lower pressure than the said valving means.
4. A device according to claim 3, wherein instruments for measuring pressure are provided on said first tubing elements and on said common return pipe.
5. A device allowing the repeated injection of a grout material in liquid state into a volume to be treated, comprising pumping means; valving means; a first tubing element joining said pumping means to said valving means at the upstream end of said valving means for conducting grout material from said pumping means to said valving means; a second tubing element connected to said valving means at the downstream end of said varying means and a valve device in said second tubing element for varying the pressure in said second tubing element, said valving means being constructed to open to the volume to be treated only when the pressure of the grout material exceeds a given minimum value.
6. A device according to claims 3, 4 or 5, wherein the valving means comprises a perforated tubular body sur-rounded by a sleeve made of resiliently flexible material.
7. A device according to claim 5, comprising several valving means each connected through a first tubing element to said pumping means and through a second tubing element to a common return pipe which, in turn, is connected to said valve device; further comprising non-return valves each on said second tubing elements, said non-return valves opening under a lower pressure than the said valving means.
8. A device according to claim 7, wherein ins-truments for measuring pressure are provided on said first tubing elements and on said common return pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000329621A CA1180632A (en) | 1978-06-23 | 1979-06-13 | Device for the repeated injection of grout material in liquid state into a volume to be treated |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7818841 | 1978-06-23 | ||
| CA000329621A CA1180632A (en) | 1978-06-23 | 1979-06-13 | Device for the repeated injection of grout material in liquid state into a volume to be treated |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1180632A true CA1180632A (en) | 1985-01-08 |
Family
ID=4114433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000329621A Expired CA1180632A (en) | 1978-06-23 | 1979-06-13 | Device for the repeated injection of grout material in liquid state into a volume to be treated |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1180632A (en) |
-
1979
- 1979-06-13 CA CA000329621A patent/CA1180632A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |