FR3058426A1 - METHOD FOR ANCHORING AND LESTAGE FOR BURNING OF A TANK OR TANK IN THE SOIL SUBJECT TO THE PRESENCE OF WATER AND PREFABRICATED SLAB FOR CARRYING OUT SAID METHOD - Google Patents

Abstract

An anchoring and weighting method for the buried laying of a tank (4) in a soil subject to the presence of water, characterized in that it comprises the steps of: - prefabricating at the factory a series of slabs d anchoring and weighting (1.1, 1.1.2), each equipping them, on their upper face (2) anchors (6) sealed in appropriate positions to facilitate the docking of a tank (4), - transport a prefabricated slab (1, 1.1, 1.2) to a buried laying pit and position it horizontally at the bottom of this pit, so that its upper face (2) faces outwards, position a tank (4) above this prefabricated slab (1, 1.1, 1.2), and - docking this tank (4) to the anchoring members (6).

Description

© Publication no .: 3,058,426 (to be used only for reproduction orders)

©) National registration number: 16 60724 ® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

COURBEVOIE

©) Int Cl ⁸ : E 02 D 27/38 (2017.01), E 02 D 31/12, 27/36

A1 PATENT APPLICATION

©) Date of filing: 07.11.16. ©) Applicant (s): F2F Simplified joint stock company - (30) Priority: FR. ©) Inventor (s): BAUDRY GERALD, THEBAULT GERALD and MOREL BENOIT-PIERRE. (43) Date of public availability of the request: 11.05.18 Bulletin 18/19. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ©) Holder (s): F2F Simplified joint-stock company. related: ©) Extension request (s): @) Agent (s): CABINET HERRBURGER.

ANCHORING AND BALLASTING PROCESS FOR THE UNDERGROUND LAYING OF A TANK OR TANK IN THE SOIL SUBJECT TO THE PRESENCE OF WATER AS WELL AS A PREFABRICATED SLAB FOR THE IMPLEMENTATION OF THIS PROCESS.

FR 3 058 426 - A1

Anchoring and ballasting process for the buried laying of a tank (4) in soil subject to the presence of water, characterized in that it comprises steps consisting in:

- prefabricate in the factory a series of anchoring and ballasting slabs (1,1. 1,1.2), by equipping them each, on their upper face (2) with anchoring members (6) sealed in appropriate positions to facilitate mooring of a tank (4),

- transport a prefabricated slab (1,1,1,1.2) to a buried installation pit and position it horizontally at the bottom of this pit, so that its upper face (2) faces outwards, position a tank (4) above this prefabricated slab (1, 1.1, 1.2), and

- moor this tank (4) to the anchoring members (6).

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The present invention relates to an anchoring and ballasting process for the buried laying of a tank or a tank in a soil subject to the presence of water.

In soils subject to the presence of water, in particular clay or hydromorphic soils, buried tanks or cisterns are subjected to Archimedes' thrust which has the consequence of risking their ascent to the level of the natural ground, which of course should be avoided.

To remedy this phenomenon, underground tanks or cisterns are conventionally anchored on ballast slabs made up of scrap concrete platforms positioned at the bottom of a previously dug pit.

Such rafts are made by pouring concrete on site, which requires the intervention of a concrete supplier, most often outside the company installing the underground tank or tank, and involves the transport of a router. concrete on site.

However, this situation leads to delays in supply and to cost and synchronization constraints of the various parties involved, so as to delay the implementation of the other steps necessary for the buried laying of the tank or tank and consequently to increase the delay. of construction.

Indeed, to allow a satisfactory buried installation of tanks or cisterns, installing companies must follow specific recommendations which have been defined by specialists.

After pouring the raft, it is in particular recommended to implement additional laying steps consisting in:

- make a steel anchoring system for securing the tank or the tank in particular, by means of straps, place a geotextile on the walls of the pit, make a bed for laying the tank or the tank with sand or gravel rolled to a minimum thickness of 10 cm, place the tank or tank on this laying bed and strap it using, if necessary, anchor rings provided for this purpose, or in the absence such anchoring rings by strapping from above, and simultaneously fill the tank or tank with clean water and backfill with sand or gravel rolled to the top of it, then complete this backfilling with topsoil.

However, with the exception of the realization of the anchoring system which must necessarily be carried out in fresh concrete, these various additional laying steps can only be implemented satisfactorily after an incompressible waiting time of at least one day to let the concrete of the raft dry, which requires stopping the site during this waiting time and entails additional constraints of cost and synchronization for the installing company.

Indeed, if this waiting time is not respected, we come up against the following disadvantages:

the installation of the geotextile is impossible without "wading" in the liquid concrete, the laying bed mixes with the liquid concrete, the tank or the tank cannot be anchored on a hard surface, the strapping of the tank or the tank cannot be carried out insofar as the anchoring system is not secured to the raft, and

- the final backfilling risks "driving out" the liquid concrete (by the effect of the fall of a solid body in a fluid body), which results in the obtaining of a heterogeneous raft.

To overcome the aforementioned drawbacks, the idea had been developed, in accordance with the invention, to depart from the conventional buried laying process for tanks or cisterns traditionally used for decades by proposing an anchoring and ballasting process for the buried installation of a tank or tank in soil subject to the presence of water, in particular hydromorphic soil which does not require the manufacture of a slab by pouring concrete on site at the bottom of a previously dug pit.

The first step of this process, in accordance with the invention, consists in prefabricating in the factory, a series of anchoring and ballasting slabs, in particular of essentially rectangular shape, having a geometry adapted to that of tanks or tanks to be installed by equipping them. each, on one of their main faces or upper face of anchoring members sealed therein, in suitable positions to facilitate mooring, in particular the strapping of a tank or a tank.

The prefabricated slabs thus have a length and a width defined according to the characteristics of the tanks or tanks intended to be stowed there.

It is, moreover, necessary, in accordance with the invention, that the nature and the positioning of the anchoring members sealed in these prefabricated slabs be precisely adapted to the geometry of these tanks or of these tanks to facilitate their stowage.

These anchoring devices must in particular be located near the anchoring rings, if any, provided on the tanks or tanks or where the straps passing over the top of the tanks or tanks are to be placed.

Thus, the distance between the anchoring rings equipping, if necessary, the tanks or the tanks and the anchoring members sealed in the prefabricated slabs is predetermined to allow the fitting of suitable securing means (straps, hooks , belts, ...).

It should be noted that this precise positioning of the anchoring members on the prefabricated slabs corresponds to an essential characteristic of the process according to the invention which is likely to greatly simplify the securing of tanks or tanks by comparison with the process. conventional buried installation of these according to which it is customary to use, to carry out this lashing of the straps having a length of approximately 3 m to remedy the fact that the installing companies minimize the impact of their positioning and the randomly and often not optimized and insufficiently adapted to the good mechanical strength of the tank or the tank, in positions too far from the latter.

The second step of the anchoring and ballasting process according to the invention consists in transporting at least one prefabricated slab to a buried laying pit previously dug, and in positioning it horizontally at the bottom of this pit using a lifting device, so that its upper side faces outwards.

This second step of the method according to the invention can be followed by the above-mentioned additional laying steps, preconi3058426 carried out by specialists within the framework of the implementation of the conventional method of laying buried tanks or cisterns and is in particular followed by a step consisting in placing a tank or a tank on an intermediate laying bed above the prefabricated slab previously positioned at the bottom of the pit by means of a lifting device, and in mooring this tank or this tank to the organs of anchoring of the prefabricated slab, in particular by means of straps.

It should be noted that during the implementation of the process according to the invention, the prefabricated slabs equipped with anchoring members can be delivered to the site at the same time as the tanks or tanks, or to any moment before the buried installation of these, insofar as these prefabricated slabs do not correspond to a perishable product like fresh concrete.

In addition, the additional laying steps can be implemented immediately following the positioning of the prefabricated slab at the bottom of the pit without waiting time for concrete to dry, which makes it possible to reduce, to a large extent, the duration overall necessary for the completion of the site.

It should also be noted that during the implementation of the process according to the invention, the anchoring members sealed in the prefabricated slabs are also used to lift these slabs and carry out their handling.

However, on site, it is advantageous to carry out this handling with the same lifting devices as those used to carry out the handling of the tanks or tanks themselves, such as for example mini excavators.

For this reason, the prefabricated slabs must not be too heavy and their thickness must more precisely be calculated so that their mass does not exceed a maximum value, for example situated in the range between 800 and 1200 kilograms.

Consequently, depending on the laying conditions, the depth at which the water is in the ground, the height of the embankment and the mass of the tank or the tank itself, a single prefabricated slab may not be sufficient. to ensure the ballast of it.

Consequently, according to the invention, it is also proposed to stack several prefabricated slabs and to join them together so as to prevent soil water from being able to move them relative to one another.

To this end, and according to a particular embodiment, the method according to the invention comprises steps consisting in:

- during their factory prefabrication, also equip the anchoring and ballasting slabs at their angles on the one hand with through holes and, on the other hand, with grooves extending on the underside of these slabs, in line with these through holes, transport several prefabricated anchoring and ballasting slabs to a buried laying pit previously dug and stack them horizontally at the bottom of this pit using a lifting device so that their upper face either faces outwards and the through holes are located in the extension of each other at each of the corners of the slabs,

- securing the stacked anchor and ballast slabs to each other, and

- moor a tank or cistern to the anchoring members of the prefabricated slab located above the pile.

The grooves made on the underside of the slabs may have only a single branch without thereby departing from the scope of the invention; however, these grooves advantageously each have two branches, preferably perpendicular and extending respectively parallel to the length and width of the slabs, and intersecting in line with the through holes.

In accordance with the invention, the prefabricated slabs can be secured by means of, on the one hand, threaded rods introduced into the through holes and, on the other hand, of washers and nuts or of perforated tools in the form of elongated plates having a geometry adapted to that of the gorges, specifically designed.

It should be noted that, in accordance with the invention, this joining can be carried out after stacking the prefabricated slabs in the pit, in which case the installing company must then introduce tools designed specifically in the grooves equipping the lower slab, either in lengthwise, either widthwise se3058426

Ion the geometry of the pit and the most accessible locations when the grooves have two branches, then pass threaded rods through the holes through slabs located in line with each other and fix them to these tools.

It is however also possible to place in the pit the tools designed specifically prior to the stacking of the prefabricated slabs so that they are then positioned in the grooves of the lower slab and then to fix the threaded rods therein before stack the prefabricated slabs by inserting the threaded rods in the through holes.

The invention also relates to a prefabricated anchoring and ballasting slab allowing the implementation of the above-mentioned method.

According to the invention, such a slab is constituted by an element of essentially rectangular shape equipped, on the one hand, on its upper face with anchoring members sealed at at least two of its edges as well as, d 'other hand, at its angles, through holes and grooves extending on its underside.

According to an advantageous characteristic of the invention, the 20 grooves located on the underside of the slab have two branches, preferably perpendicular and extending respectively parallel to the length and the width of this slab and intersecting at the level of the bores through.

According to another characteristic of the invention, such a slab has a thickness calculated so that it has a mass not exceeding a maximum value, by way of example, situated in the range between 800 and 1200 kg.

According to another characteristic of the invention, the anchoring members are sealed in cavities making it possible to protect them during the stacking of several slabs.

Such a prefabricated slab can advantageously be made of reinforced concrete and be equipped with anchoring members constituted by concrete irons.

The characteristics of the anchoring and ballasting process as well as of the prefabricated slab which are the subject of the invention will be described in more detail with the aid of the nonlimiting drawings annexed in which:

FIG. 1 is a perspective view showing the upper face of an anchoring and ballasting slab,

FIG. 2 is a perspective view showing the underside of this anchoring and ballasting slab,

FIGS. 3a and 3b are sectional views at one of their angles of two anchoring and ballasting slabs superimposed and secured,

- Figure 4 is a perspective view showing a tank positioned on these two anchoring and ballasting slabs, the laying bed not being shown.

According to FIGS. 1 and 2, the anchoring and ballasting slab 1 is constituted by a prefabricated rectangular element of reinforced concrete comprising an upper face 2 visible in FIG. 1 and a lower face 3 visible in FIG. 2.

The dimensions of this anchoring and ballasting slab 1 are adapted to the geometry of a tank 4 intended to be anchored thereon as shown in FIG. 4.

According to FIG. 1, the anchoring and ballasting slab 1 is equipped, on its upper face 2 and along its edges 15 with a series of cavities 5 in which are respectively anchored members 6 constituted by concrete irons and the distribution of which is determined so as to simplify the securing of the tank 4.

The positioning of these anchoring members 6 in cavities 5 makes it possible to protect them when several anchoring and ballasting slabs 1.1, 1.2 are stacked and joined together as will be described in more detail in the remainder of this description, with reference to Figures 3a, 3b and 4.

According to FIG. 1, the anchoring and ballasting slab 1 is also equipped, at its four angles, with through-holes 7 having the function of making it possible to secure several slabs 1.1, 1.2 previously stacked as it will be, here again, described in more detail later in this presentation with reference to FIGS. 3a, 3b and 4.

According to FIG. 2, the anchoring and ballasting slab 1 is equipped on its underside 3 and at its groove angles 8 extending in line with the through holes 7.

Each of these grooves 8 comprises two perpendicular branches 8.1, 8.2 extending respectively parallel to the length and the width of the slab 1 and opening on an edge 15 thereof.

The two branches 8.1, 8.2 of a groove 8 intersect at the right of an associated through-hole 7.

According to FIGS. 3a, 3b and 4, the through holes 7 as well as the grooves 8 have the function of making it possible to secure two anchoring and ballasting slabs 1.1 at each of their four angles,

1.2 previously stacked on top of each other, so that their through holes 7 are respectively located in the extension of each other to allow the introduction of threaded rods 9.

More precisely and according to FIGS. 3a and 3b, to allow this joining, perforated tools in the form of elongated plates 10 having a geometry adapted to that of the grooves 8 and through holes 7 have been introduced into one of the branches 8.1, 8.2 of the grooves 8 located on the underside 3 of the lower slab 1.2 so that their perforations 16 are located in line with the through holes

7.

These tools in the form of elongated plates 10 are equipped with perforations 16 of nuts 11 integral with them, the thread of which corresponds to the thread of the rods 9 to allow their fixing at this level.

According to FIG. 3a, a perforated tool 10 in the form of an elongated plate is also applied at the four angles of the upper face 2 of the upper anchoring and ballasting slab 1.1 so that its perforation 16 is located in line with the through hole. 7 and associated threaded rod 9.

A nut 13, integral with the tool 10, whose thread corresponds to the thread of the rod 9, allows the final attachment of the two anchoring and ballasting slabs 1.1 and 1.2.

According to FIG. 3b, the perforated tool 10 in the form of an elongated plate applied to the upper face 2 of the upper anchoring and ballasting slab 1.1 is replaced by a nut 13 and a washer 14.

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Claims (6)

1) Anchoring and ballasting process for the buried laying of a tank or a tank (4) in a soil subject to the presence of water, in particular hydromorphic soil, characterized in that it comprises stages consisting of: prefabricate in the factory a series of anchoring and ballasting slabs (1,1.1,1.2), in particular of essentially rectangular shape having a geometry adapted to that of tanks or cisterns (4) to be fitted by fitting them each, on the one of their main faces or upper face (2) of anchoring members (6) sealed therein, in suitable positions to facilitate mooring, in particular the strapping of a tank or a tank ( 4), transport at least one prefabricated slab (1, 1.1, 1.2) to a buried laying pit previously dug and position it horizontally at the bottom of this pit using a lifting device, so that its upper face (2) either turned outwards, position a tank or a tank (4) on an intermediate laying bed above this prefabricated slab (1, 1.1, 1.2) by means of a lifting device, and moor this tank or this tank (4) with anchoring members (6) sealed strips in the prefabricated slab (1, 1.1, 1.2), in particular by means of straps. 2 °) Process according to claim 1, characterized in that it comprises steps consisting in: during their factory prefabrication, equip the anchoring and ballasting slabs (1, 1.1, 1.2) at their angles on the one hand, through holes (7), and on the other hand with grooves extending on the underside of these slabs (1, 1.1, 1.2) in line with the through holes (7), and transport several prefabricated anchoring and ballasting slabs (1, 1.1, 1.2) towards a buried laying pit previously dug and stack them horizontally at the bottom of this pit using a lifting device so that their upper face (2) faces outwards and the holes through (7) are located in the extension of each other at each of the corners of the slabs (1, 1.1, 1.2), secure the anchoring and ballasting slabs (1, 1.1, 1.2) stacked, and moor a tank or tank (4) to the anchoring members (6) of the prefabricated slab (1.1) located above the pile. 3) Prefabricated anchoring and ballasting slab (1, 1.1, 1.2) allowing the implementation of the method according to any one of claims 1 and 2, characterized in that it consists of a form element essentially rectangular fitted, on the one hand, on its upper face (2), with anchoring members (6) sealed at at least two of its edges 15, and on the other hand, at its corners , through holes (7), and grooves (8) extending on its underside (3). 4) Prefabricated anchoring and ballasting slab (1, 1.1, 1.2) according to claim 3, characterized in that the grooves (8) each have two branches (8i, 82) preferably perpendicular and s' extending respectively parallel to the length and the width of the slab (1, 1.1, 1.2) and crossing at the level of the through holes (7). 5 °) prefabricated anchoring and ballasting slab (1, 1.1, 1.2) according to one of claims 3 and 4, characterized in that it has a mass not exceeding a maximum value, in particular located in the range between 800 and 1200 kg. 6 °) prefabricated anchoring and ballasting slab (1, 1.1, 1.2) according to one of claims 3 to 5, characterized in that the anchoring members (6) are sealed in cavities (5) allowing protect them when stacking several tiles (1, 1.1, 1.2). 5 7 °) Prefabricated anchoring and ballasting slab (1, 1.1, 1.2) according to one of claims 3 to 6, characterized in that it is made of reinforced concrete. îo 8 °) Prefabricated anchoring and ballasting slab (1, 1.1, 1.2) according to claim 7, characterized in that the anchoring members (6) are concrete irons. 1/3