FR2889096A1 - INSTALLATION FOR TREATING LIMONOUS FLOORS OF A SITE AND METHOD FOR TREATING THESE LIMITOUS WINDINGS USING THE SAME - Google Patents

Abstract

The invention relates to a facility for treating silt excavation of a construction site.It is characterized in that said installation comprises: - a vibrating hopper (2), called inlet hopper; - a conveyor (3), called weighing system, incorporating continuous weighing means (4) for the transported load, - at least one storage tank (5) for a binder, - binder dosing means (6) as a function of the weighing performed at level of the weighing conveyor (3); - kneading means (7) of a silt / binder assembly making it possible to obtain at the outlet of the installation (1) a material that can be used as backfill that can be compacted.

Description

INSTALLATION FOR TREATMENT OF LIMONEUX DEBLAIS

  FIELD OF THE INVENTION AND METHOD FOR THE TREATMENT OF THESE LIMONOUS WINDOWS USING THE SAME INSTALLATION The present invention relates to a silt dewatering treatment installation of a construction site.

  The invention also relates to a method of treating these loamy cuttings as well as to the materials obtained.

  The invention will find its main application in the realization from silt cuttings of materials used as backfill materials.

  However, this application is not limiting and the materials obtained can find other destinations such as use in embankments.

  In the field of public works, it is very often carried out earthworks either to build foundations or for the passage of pipes or cables.

  The cuttings generated must either be used after treatment or be stored, particularly in landfills.

  It is certain that the transport of these cuttings requires a large number of significant truck rotation generating a significant environmental and economic cost. It is therefore particularly interesting for building and public works companies to use these excavations directly on site.

  In addition, once the earthworks are completed, it may be necessary to fill the trenches. To do this, fill materials are provided, these materials having to have specific characteristics to comply with the standards in force and in particular, concerning their physical, mechanical and chemical properties of these materials.

  Since the excavated material removed from the site is not homogeneous, it can not be used as backfill material.

  In particular, the slimes removed from the site have a water content that is too high and must be dried before they can be used as backfill material.

  Various methods have been proposed for the treatment of silt by adding one or more adjuvants, one of the adjuvants having a drying reaction on the silt.

  However, in the existing processes, there is the problem of the dosage of the adjuvant in relation to the amount of slimes treated.

  It is important to note that, at this level, a precise metering must be carried out in order to be able to obtain a backfill material whose physical, chemical and mechanical characteristics are known in advance.

  The solutions proposed so far are not satisfactory on this point since they propose a dosage: - either manual of the amount of adjuvant which is very imprecise, in particular because it is not adjusted in real time, either an automatic adjustment according to a volume of material to be treated which is also imprecise since we do not know the density of the material to be treated in a certain way, is still an automatic adjustment according to a conveyor speed of a conveyor bringing the materials to be treated which is still a very imprecise method given the irregularity of the supply of the conveyor.

  The present invention aims to overcome the aforementioned disadvantages and to this end, to provide a silt debris treatment facility of a site to obtain the output materials suitable for backfilling and whose physical, mechanical and chemical characteristics are adjusted by the installation.

  Another object of the present invention is to provide a silt removal treatment facility of a site in which the cuttings can be mixed with one or more adjuvants so as to modify the physical, mechanical and chemical characteristics of the output material.

  Another object of the present invention is to provide a plant for the treatment of silt cuttings of a building site comprising kneading means making it possible to obtain, at the outlet, materials with a granulometry or a controlled particle size zone.

  Another object of the present invention is to provide a silt dewatering treatment facility of a construction site comprising means for analyzing the characteristics of the materials obtained at the outlet.

  Another object of the present invention is to provide a facility for treating silt debris of a construction site in which the various components form a compact assembly so as to be movable on site.

  To this end, the present invention proposes a facility for treating loamy cuttings of a construction site such that, according to the invention, the installation comprises: a vibrating hopper, called an inlet hopper; - A conveyor, called weighing, incorporating weighing means continuously load transported; at least one storage tank for a binder; means for dosing the binder as a function of the weighing carried out at the level of the weighing conveyor; - Mixing means of a set of lime / binder to obtain at the output of a material capable of being used as backfill can be compacted.

  The invention also relates to a method for treating loamy cuttings of a construction site used in the silt dewatering treatment plant as mentioned above.

  Other characteristics and advantages of the invention will emerge more clearly on reading the description hereafter of a preferred embodiment, in which the description is given by way of non-limiting example with reference to FIGS. attached drawings among which: Figure 1 shows schematically in side view an embodiment of the device according to the invention, some parts of the installation being made transparent to facilitate understanding of the installation; Figure 2 shows the installation of Figure 1 coupled to an input conveyor and an output conveyor; FIG. 3 represents a view from above of the assembly represented in FIG. 2.

  Principally, in Figure 1, there is shown a facility 1 for treating loamy cuttings.

  This installation comprises: a vibrating hopper 2, called inlet hopper; a conveyor 3, called weighing, integrating weighing means 4 continuously load transported; at least one storage tank of a binder; binder dosing means 6 as a function of the weighing 15 performed at the conveyor 3.

  The installation further comprises means 7 for mixing the slime / binder mixture making it possible to obtain at the outlet of the installation 1 a material that can be used as backfill that can be compacted.

  Advantageously, said vibrating hopper 2 will be equipped in its lower part with a screen 12 making it possible to evacuate the upper fraction allowed by the kneader.

  Advantageously, the inlet hopper 2 will be of the anti-clogging type.

  Said vibrating hopper 2 may also be coupled to a sweeper, so as to facilitate the passage of the fragmented silt and its reception on the weighing conveyor 3.

  Advantageously, the various elements will be subject to a structure 8 to ensure the installation a strong compactness and make the installation mobile.

  Thus, the treatment plant 1 can be transported by truck 30 hay or machine carrier and then be placed on the ground in a fixed position or be moved to the site.

  It will be possible in particular to provide at the level of the structure 8 gripping elements to allow the handling of the installation, including using slings.

  As indicated above, the cuttings treatment plant comprises at least one storage tank of a binder 5.

  This binder is advantageously lime for evaporating water and reduce the water content of the silt.

  However, it will also be possible to provide the addition of other adjuvants according to the specific qualities expected for the output product. The quantity of binder is delivered in the mixing means 7 from the metering means 6.

  These dosing means 6 advantageously allow weighing of the binder (s) as a function of the weighing performed at the level of the second conveyor 3.

  Thus, it is therefore possible from the present invention to achieve a very accurate dosage of the amount of material provided binders to obtain a final product whose water content is homogeneous and whose proportion binder is also identical .

  In order to ensure a mixture of the silt / binder combination, it will be advantageous to carry out the kneading 7 with a multi-link multiblade and pallet mixer.

  Of course, other means known to those skilled in the art could have been considered to achieve the mixture.

  The weighing means 4 of the load transported by the conveyor 3 are preferably constituted by a set of sensors 4 arranged at the level of the conveyor 3. It may in particular be sensors of the Peson type.

  In order to facilitate the use of the installation 1, there will also be provided an additional conveyor said feed conveyor 9 found in Figure 3.

  In the same way, it will be possible to provide an exit conveyor 10 allowing the transport of the final product obtained at the outlet of the mixing means 7.

  According to another advantageous characteristic of the invention, it will also be possible to provide additional delivery means, not shown in the accompanying drawings, of a binder at the level of the vibrating hopper 2.

  This characteristic will be particularly useful when the silt will have a high water content.

  It is also possible to provide at the outlet of the mixing means 7, according to another advantageous characteristic of the invention, means for measuring the moisture content of the final product obtained.

  It may in particular be to achieve this measurement of humidity to use microwave techniques.

  In this regard, the metering means 6 comprise data processing means 11 from the weighing means 4 so as to adapt the quantity of binder to be delivered, these processing means 11 further comprising manual and automatic regulation means by which the data relating to the product to be output is introduced.

  In the variant in which means for measuring the moisture content of the final product are used, it may also be provided that these processing means 11 are connected to the means for measuring the water content so as to constitute a regulatory loop between the data entered manually or automatically, the data from the weighing means and the data from the means for measuring the water content.

  The invention also relates to a method for implementing the aforementioned installation.

  In this process, the following steps are successively carried out: conveying the cuttings to the vibrating hopper 2; filling the cuttings in said vibrating hopper 2; conveying and weighing cuttings by means of the conveyor 3 and weighing measurement means 4; dosing of at least one binder according to the weighing; - Mixing of the cuttings / binder assembly by means of kneading means 7; recovery of the backfill material obtained at the outlet. 30

  It is important to note that the assay performed in the dosing means 6 depends on the weighing performed by the measuring means 4 but also manually entered data at the level of the processing means 11. For example, the operator can to enter at the level of the processing means 11 information on the final product to obtain and in particular its moisture content and also the expected moisture content of the cuttings, this rate being obtained from prior analysis of the silt.

  It is also important to note that, if the moisture content of the cuttings is important, proceed to a preliminary step of drying the silt at the so-called vibrating hopper 2 input.

  According to an advantageous characteristic of the invention, it will also be possible to provide, at the level of the treatment process, an additional step allowing the verification of the water content of the final product, in particular from a microwave technique.

  Of course, other embodiments within the reach of those skilled in the art could also be envisaged without departing from the scope of the patent defined by the claims below.

Claims (2)

8 claims   1. Facility for treating loamy cuttings of a building site, CHARACTERIZED in that said installation comprises: - a vibrating hopper (2), called inlet hopper; - A conveyor (3), called weighing, incorporating weighing means (4) continuously load transported; at least one storage tank (5) of a binder; - Means (6) for dosing the binder according to the weighing performed at the weighing conveyor (3); - Mixing means (7) of a set lime / binder to obtain at the output of installation (1) a material capable of being used as backfill can be compacted.   2. Treatment plant according to claim 1, comprising means for delivering a binder at the vibrating hopper (2).   3. Treatment plant according to claim 1, comprising a conveyor (9) said feed conveyor for introducing silt into the vibrating hopper (2).   4. Processing plant according to any one of claims 1 to 3, wherein the vibrating hopper (2) comprises a screen in the bottom of the hopper and is coupled to a lopper.   5. Treatment plant according to any one of claims 1 to 4, comprising two storage tanks (5) with independent dosing means (6).   6. Treatment plant according to any one of claims 1 to 5, wherein the weighing means (4) consist of a set of sensors distributed at the conveyor (3) and allowing continuous weighing of the load transported.   7. Treatment plant according to any one of claims 1 to 6, wherein output of the mixing means (7), means for measuring the moisture content of the material capable of being used as backfill can be compacted.   8. Processing plant according to any one of claims 1 to 7, wherein the vibrating hopper (2), the weighing conveyor (3), said at least one storage tank (5), the dosing means of the binder (6) and the mixing means (7) are subjected to a frame (8) so as to move the treatment plant.   9. A method for treating silt cuttings implementing a treatment plant according to any one of claims 1 to 8, wherein is carried out successively the following steps: - a step of conveying the cuttings to a vibrating hopper 10 (2) ; a step of filling the cuttings in the hopper (2); a step of conveying and weighing the cuttings by means of a conveyor (3) and weighing means (4); a step of dosing at least one binder as a function of the weighing performed by the dosing means (6); a step of kneading the cuttings / binder assembly; a step of recovering the material able to serve as backfill obtained at the outlet.   10. The treatment method according to claim 9, wherein there is further provided a verification step at the outlet of the water content of the material suitable for use as backfill.