EP2031132A2 - Soil improvement process using jet grouting which provides high grouting material savings - Google Patents
Soil improvement process using jet grouting which provides high grouting material savings Download PDFInfo
- Publication number
- EP2031132A2 EP2031132A2 EP07150016A EP07150016A EP2031132A2 EP 2031132 A2 EP2031132 A2 EP 2031132A2 EP 07150016 A EP07150016 A EP 07150016A EP 07150016 A EP07150016 A EP 07150016A EP 2031132 A2 EP2031132 A2 EP 2031132A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- jet
- soil
- soil improvement
- water
- improvement process
- 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.)
- Withdrawn
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
Definitions
- the present invention relates to a soil improvement process using jet grouting, which provides considerable savings in grouting material.
- the soil improvement process known in the art as jet grouting is known to require in situ mixing of soil with a grout (usually a mixture of water and cement), which is injected therein under high pressure (above 200 bar).
- This process destroys the soil matrix and creates a soil and grout mixture to form a homogeneous and continuous columnar element having predetermined mechanical characteristics.
- a variety of soil improvement mixtures may be formed, by changing the type of grouting mixture depending on the soil type or by changing the angles of rotation of the tool or not rotating it at all, or the tool withdrawal time.
- This may substantially provide cylindrical columns by continuous 360° rotation of the tool in combination with an upward vertical translation thereof, or quasi-rectangular panels by withdrawing the tool without rotating it.
- This prior art method involves considerable cement waste, because during injection most of the injected material overflows due to an un unbalance between the injected volume and the volume to be stabilized.
- the object of the present invention is to dramatically reduce cement waste during the injection step.
- the process when carried out in suitable soils, consists in forming part of the column volume in a downstage 2-fluid (air and water) Water-Jet (WJ) step, and in forming the rest of the volume (still downstage) using cement grout and air as a soil eroding fluid to be pumped through the same nozzle (double fluid Grout-Jet - GJ).
- WJ Water-Jet
- both steps are carried out while the nozzle is moved down.
- the soil is drilled to a desired depth using a conventional tool, in a socalled exploration drilling step.
- W.J. designates the layer formed using the double fluid (air and water) Water jet technology
- G.J. designates the layer formed using the Grout-Jet technology.
- the process includes:
- This process is also applicable to the multiple nozzle configuration.
Abstract
Description
- The present invention relates to a soil improvement process using jet grouting, which provides considerable savings in grouting material.
- The soil improvement process known in the art as jet grouting is known to require in situ mixing of soil with a grout (usually a mixture of water and cement), which is injected therein under high pressure (above 200 bar).
- This process destroys the soil matrix and creates a soil and grout mixture to form a homogeneous and continuous columnar element having predetermined mechanical characteristics.
- A variety of soil improvement mixtures may be formed, by changing the type of grouting mixture depending on the soil type or by changing the angles of rotation of the tool or not rotating it at all, or the tool withdrawal time.
- This may substantially provide cylindrical columns by continuous 360° rotation of the tool in combination with an upward vertical translation thereof, or quasi-rectangular panels by withdrawing the tool without rotating it.
- Pressures of up to 400-600 bar are currently used.
- Thus, in prior art a mixture of water and cement is injected under high pressure during withdrawal of the tool to form the desired volume.
- This prior art method involves considerable cement waste, because during injection most of the injected material overflows due to an un unbalance between the injected volume and the volume to be stabilized.
- The object of the present invention is to dramatically reduce cement waste during the injection step.
- Considerable grout savings derive from the provision that the column volume is partly formed of water, which is later displaced by the backfill (rich in grouting material), during the Grout-jet (GJ) step, in which the upwardly flowing backfill displaces the "slurry" created during the previous step.
- Thus the process, when carried out in suitable soils, consists in forming part of the column volume in a downstage 2-fluid (air and water) Water-Jet (WJ) step, and in forming the rest of the volume (still downstage) using cement grout and air as a soil eroding fluid to be pumped through the same nozzle (double fluid Grout-Jet - GJ).
- It shall be noted that both steps are carried out while the nozzle is moved down.
- These objects and advantages are achieved by the soil improvement process using jet grouting, which provides considerable savings in grouting material according to the present invention, which is characterized by the annexed claims.
- This and other features will be more apparent upon reading the following description of the process, which is shown by way, of example and without limitation in the accompanying drawings, in which:
-
Figure 1 is a diagrammatic representation of the present process; -
Figure 2 is a simplified representation of the process in the completion stage. - Referring to
Figure 1 , the soil is drilled to a desired depth using a conventional tool, in a socalled exploration drilling step. - Particularly referring to
Figures 1 and 2 , W.J. designates the layer formed using the double fluid (air and water) Water jet technology, and G.J. designates the layer formed using the Grout-Jet technology. - In greater detail, the process includes:
- a first step of drilling soil from ground level to column head level;
- a second downstage (Water-Jet) step at constant speed from the column head to a depth in a range from 1/3 to 2/3 of the total length of the column, using water jacketed in air (double fluid step);
- a third (Grout-Jet) step, still downstage, at constant speed and with constant parameters (different from those of the previous step) which uses cement grout (i.e. grouting material, cement) jacketed in air (double-fluid step) to be pumped through the same nozzle as used in the previous step. In this step, the backfill material, rich in grouting material, displaces the "slurry" created during the second step, thereby providing uniform physical and mechanical properties of the jet grouting column throughout its length (see
Fig. 2 ). - This process is also applicable to the multiple nozzle configuration.
Claims (5)
- A soil improvement process using jet grouting, which provides considerable savings in grouting material, characterized in that it allows, in suitable soils, part of the column volume to be formed in a Water-Jet (WJ) step, using 2 soil eroding fluids, i.e. air and water, and the rest of the volume to be formed using cement grout jacketed in air as a soil eroding fluid to be pumped through the same nozzle in the Grout-Jet (GJ) step; said steps are both carried out in the nozzle descending stage; the slurry created during the Water Jet (WJ) is displaced by the backfill (rich in grouting material) during the Grout-Jet (GJ) step.
- A soil improvement process as claimed in claim 1, characterized in that it includes a first step of drilling the soil from ground level to column head level.
- A soil improvement process as claimed in claim 1, characterized in that the downstage Water-Jet (WJ) step is carried out at constant speed from the column head to a depth in a range from 1/3 to 2/3 of the total length of the column.
- A soil improvement process as claimed in claim 1, characterized in that the downstage Grout-Jet (GJ) step is carried out at constant speed and with constant parameters, different from those of the previous step using the same nozzle as in the previous step.
- A soil improvement process as claimed in claim 1, characterized in that one or more nozzles are used therein.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITPR20070066 ITPR20070066A1 (en) | 2007-08-28 | 2007-08-28 | PROCEDURE FOR CONSOLIDATING TYPES OF JET GROUTING WITH A HIGH SAVINGS OF CONSOLIDATING PRODUCT |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ITPR20070066 Previously-Filed-Application | 2007-08-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2031132A2 true EP2031132A2 (en) | 2009-03-04 |
EP2031132A3 EP2031132A3 (en) | 2012-08-15 |
Family
ID=40019411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07150016A Withdrawn EP2031132A3 (en) | 2007-08-28 | 2007-12-13 | Soil improvement process using jet grouting which provides high grouting material savings |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2031132A3 (en) |
IT (1) | ITPR20070066A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102966088A (en) * | 2012-11-14 | 2013-03-13 | 河海大学 | Discontinuous combined pile for reinforcing hard soil interlayer-containing soft soil foundation and construction method of discontinuous combined pile |
GB2541043A (en) * | 2015-07-30 | 2017-02-08 | Shire Consulting Ltd | Formers |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3712151A1 (en) * | 1987-04-10 | 1988-10-27 | Gkn Keller Gmbh | Method of producing stabilising bodies in a controlled manner in highly permeable soils with the addition of a medium increasing the viscosity |
GB2227037A (en) * | 1989-01-10 | 1990-07-18 | Nit Co Ltd | Ground hardening material injector |
-
2007
- 2007-08-28 IT ITPR20070066 patent/ITPR20070066A1/en unknown
- 2007-12-13 EP EP07150016A patent/EP2031132A3/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3712151A1 (en) * | 1987-04-10 | 1988-10-27 | Gkn Keller Gmbh | Method of producing stabilising bodies in a controlled manner in highly permeable soils with the addition of a medium increasing the viscosity |
GB2227037A (en) * | 1989-01-10 | 1990-07-18 | Nit Co Ltd | Ground hardening material injector |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102966088A (en) * | 2012-11-14 | 2013-03-13 | 河海大学 | Discontinuous combined pile for reinforcing hard soil interlayer-containing soft soil foundation and construction method of discontinuous combined pile |
CN102966088B (en) * | 2012-11-14 | 2015-04-01 | 河海大学 | Discontinuous combined pile for reinforcing hard soil interlayer-containing soft soil foundation and construction method of discontinuous combined pile |
GB2541043A (en) * | 2015-07-30 | 2017-02-08 | Shire Consulting Ltd | Formers |
GB2541043B (en) * | 2015-07-30 | 2021-04-21 | Shire Consulting Ltd | Formers |
Also Published As
Publication number | Publication date |
---|---|
ITPR20070066A1 (en) | 2009-02-28 |
EP2031132A3 (en) | 2012-08-15 |
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