FR2826690A1

FR2826690A1 - Filling in of underground mining cavities comprises drilling sleeved bores followed by concrete injection and special expanding foam

Info

Publication number: FR2826690A1
Application number: FR0115689A
Authority: FR
Inventors: Jean-Paul Rey
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-29
Filing date: 2001-12-05
Publication date: 2003-01-03

Abstract

The filling and stabilization of underground mining cavities (2) is obtained by means of sleeved (4) bore shafts (3) into which expansive foam is injected at high pressure. Prior to the foam injection concrete is injected to obtain a protective layer for the expansive foam.

Description

La présente invention concerne un dispositif d'obturation des cavités souterraines de toutes sortes afin d'éviter au mieux leur effondrement suite à l'arrêt de leurs exploitations minières ou de toutes autres natures. The present invention relates to a device for closing underground cavities of all kinds in order to best prevent their collapse following the cessation of their mining operations or of any other nature.

Actuellement, les cavités souterraines d'exploitations minières sont soumises a l'abandon total de leur entretien par leurs anciens propriétaires et se trouvent confrontés à la pourriture des bois de renfort et de consoli- - dation des parois due en partie à l'humidité ambiante des sols et qui de ce fait provoque l'effondrement des masses de terre entraînant de très fortes dégradations aux bâtis de surface. Currently, the underground cavities of mining operations are subjected to the total abandonment of their maintenance by their former owners and are confronted with the decay of the reinforcing and consolidation woods - due in part to the ambient humidity. soils and which therefore causes the collapse of the earth masses leading to very strong degradation to the surface structures.

Afin de palier à ce vide du a l'extraction, la solution actuellement envisagée est l'ennoyage des sites pour combler le dit vide existant, si ce procédé est peu onéreux, il engendre à la longue une érosion des parois et donc un effondrement de celles ci, sans compter qu'il faudra sans cesse réinjecter de l'eau pour garder une masse constante d'obturation, sans pour autant éviter tout risque d'accident du terrain, entraînant l'affaissem- ent des sols de surface et a plus ou moins long terme la ruine du bâtit et de tout patrimoine existant, mais aussi la faillite économique des anciens bassins miniers déjà très touchés par la fermeture des mines.. In order to make up for this vacuum due to the extraction, the solution currently envisaged is the flooding of the sites to fill the said existing vacuum, if this process is inexpensive, it generates in the long term an erosion of the walls and therefore a collapse of these, not to mention that it will be necessary to constantly re-inject water to keep a constant mass of obturation, without however avoiding any risk of accident on the ground, causing the subsidence of the surface soils and more or less long term the ruin of the building and all existing heritage, but also the economic bankruptcy of the old mining basins already very affected by the closure of the mines.

Description La présente invention si elle se montre plus onéreuse que l'ennoyage a le mérite de combler au mieux cet espace de vide et d'éviter ainsi un trop grand tassement des. terrains et elle est de nature a être vite opérationnelle. Description The present invention if it proves to be more expensive than flooding has the merit of filling this vacuum space as well as possible and thus avoiding too great a compaction of the. land and it is likely to be quickly operational.

Son principe est simple est se base d'abord sur le repérage 1 des sites miniers. connus a stabiliser 2 par ce procédé. Its principle is simple and is based first on the location 1 of the mining sites. known to stabilize 2 by this process.

Ensuite une série de forages 3 devra être effectuée avec un diamètre suffisant pour. être gainé 4, ces forages seront fait a espacement plus ou moins grand Les forages ainsi gainés recevront en premier lieu une caméra de surveillance pour. évaluer au mieux. les besoins du site a traité. Aprés cette évaluation, les puits.. de forages 3 recevront deux tuyaux8 munis d'un réceptacle 9 de maintien de ces dit tuyaux a l'intérieur du gainage 4 pour favoriser le transport et l'injection 5 d'une mousse dite expansive ou d'un béton phénolique 6, ainsi que d'un béton pulsé 7de.. protection et cela a haute pression pour répartir au mieux et chacun a leur tour les produits 6 et 7 injectés dans la cavité souterraine a stabiliser 2 Cette opération sera précédée par l'introduction dans le site a combler d'une. structure semi rigide 11 (genre câble) en fer ou autre acier déroulée en"vrac"pour.. créer une sorte d'armature donnant aux produits injectés 6 et 7 plus de consistance. Then a series of holes 3 must be carried out with a diameter sufficient for. to be sheathed 4, these boreholes will be made at a greater or lesser spacing. The drilled wells will in the first place receive a surveillance camera for. evaluate at best. the needs of the site dealt with. After this evaluation, the wells .. of wells 3 will receive two pipes8 provided with a receptacle 9 for holding these said pipes inside the sheathing 4 to promote the transport and injection 5 of a so-called expanding foam or d 'a phenolic concrete 6, as well as a pulsed concrete 7de .. protection and this at high pressure to distribute as well as possible and each in turn the products 6 and 7 injected into the underground cavity to be stabilized 2 This operation will be preceded by l introduction to the site to be filled with. semi-rigid structure 11 (cable type) of iron or other steel unrolled in "bulk" to .. create a kind of reinforcement giving the injected products 6 and 7 more consistency.

(facultatif suivant produit injecté) pour finaliser le produit de stabilisation 10 (6+7).

(optional depending on product injected) to finalize stabilization product 10 (6 + 7).

L'opération d'injections 5 des deux composants 6 et 7 pourra être renouvelée si la.. c caméra d'évaluation des besoins du chantier fait apparaître de trop grands vides. The injection operation 5 of the two components 6 and 7 can be repeated if the .. c site needs assessment camera reveals too large voids.

1 Les dessins annexés illustrent ce que est l'invention La figure 1 représente la recherche du site par forage 1 La figure 2 représente le déroulement de la structure semi rigide 11 La figure 3 représente l'injection 5 de la mousse expansive ou du béton phénolique 6 La figure 4 représente l'injection du béton pulsé 7 sous haute pression1 The attached drawings illustrate what the invention is. Figure 1 represents the search for the site by drilling 1 Figure 2 represents the course of the semi-rigid structure 11 Figure 3 represents the injection 5 of the expanding foam or phenolic concrete 6 Figure 4 shows the injection of pulsed concrete 7 under high pressure

Claims

claims

1) Search device 1 and stabilization device 2 for underground mining cavities or. of all other natures, in order to avoid their underground collapse which results. often damage to surface frames and this by means of 3 sheathed boreholes 4 followed by injections 5 and at high pressure of a so-called expansive foam, see one. phenolic concrete 6, followed after hardening of that of a pulsed concrete 7 by means of two re-usable pipes 8 and provided with a receptacle for maintaining said ... pipes 8 each serving for its own product 6 and 7, and creating after the injection of the two components 6 and 7 the stabilization product 10 of the cavity to be restructured and. stabilize 2, injections 5 having been preceded by introduction and deployment. a semi-rigid structure 11 made of iron or other steel cable to ensure better maintenance of the injected products 6 and 7 (depending on the injected product)

2) Device according to claim 1 characterized in that the search for sites. known for their mining extraction, or of any other nature is carried out in. drilling means 3 of sufficient diameter to allow their development. inside.

3) Device according to the preceding claims characterized by the sheathing 4 as a definitive well 3.

4) Device according to claims 2, 3, characterized by the installation of two tubes 8 inside the cladding 4 of the wells 3 and their fixing receptacle 9 le. all used for receiving and injecting 5 stabilization products 6 and 7 2.

5) Device according to claims 2, 3, 4, characterized by the injection 5 of a. so-called expansive foam or a phenolic concrete 6 followed by that of a pulsed concrete 7. through the wellbore 3 sheathed 4 by means of the two pipes 8 held by the receptacle 9.

6) Device according to claims 2, 3, 4, 5, characterized by the purpose of the product 10. created by the injection of so-called expansive foam or phenolic concrete 6 and concrete. pulsed 7 by means of the pipes 8 fixed by the receptacle 9 for the purpose of stabilizing 2 underground cavities of all kinds.

7) Device according to claims 2, 3 ,, 4, 5, 6, characterized by the course of the l. structure 1 1 in the cavity for the reinforcement of stabilization products 6 and 7 2