Improved device for removing ammunition from the bottom of a water body.

Abstract

Device for removing ammunition (2), whereby the device (1) comprises an inner bell (5) which consists of a chamber (6) that is open at the underside (6a) and closed at the top by means of a roof (7) and surrounded by a closed wall (8), whereby the device is further provided with means (14) to eject the water from the chamber (6) and a gripper arm (9), whereby the inner bell (5) is provided with overpressure valves (12) and whereby the device (1) is provided with a bigger outer bell (11) provided with overpressure valves (12) and whereby the overpressure valves (12) of the outer clock (11) are connected to a discharge pipe (13), whereby the closed wall (8) at the end (8a) on the level of the open underside (6a) is provided with a broadening (8b) towards the outer clock (11), that extends in the plane of the open underside (6a).

Description

[0001] Improved device for removing ammunition from the bottom of a water body.

[0002] The present invention relates to an improved device and a method applied thereby for removing ammunition from the bottom of a water body.

[0003] In particular, the device and the method are intended for cleaning up ammunition under water in a safe way with as little impact as possible on human health and the environment .

[0004] Water body relates, among others, to seas and oceans , rivers or other waterways, coastlines, lakes, marshes , pools, ponds, canals and the like.

[0005] Munition or ammunition is understood to mean all possible projectiles and their propelling charges, for example shells, grenades, bullets, bombs, mines, torpedoes, underwater weapons, explosives, charges, missiles, and the like .

[0006] Said ammunition may have accidentally ended up on the bottom of the water body or purposefully in so-called ammunition dumps. Unused ammunition is collected in such ammunition dumps, for example shells or poison gas or mustard gas grenades, usually from one of the two World Wars . Apart from the fact that ammunition does not belong on the bottom of water bodies , rusting ammunition housing may cause the ( often) toxic content to leak into the water and / or atmosphere . In addition, the ammunition is subj ect to decline such that the content is slowly but surely released and mixes with the water .

[0007] Ammunition often contains gunpowder and explosives in the form of 2 , 4 , 6-trinitrotoluene , better known by the abbreviation TNT . TNT is known to be genotoxic . This means that TNT changes the DNA of fish or other living organisms that come into contact with it . Gunpowder on the other hand often contains the extremely toxic white phosphorus , the decomposition products of which also damage the environment .

[0008] There is also still an explosion hazard . Ammunition dumps are often located near sandbanks where a vessel could run aground and may cause the dumped ammunition to explode . Anchoring vessel s , fishing or dredging may also cause the ammunition in such ammunition dumps to explode .

[0009] Such explosions not only damage the immediate vicinity of the explosion, but may also cause tidal waves at coastlines , for example .

[0010] Ammunition on the bottom of a water body consequently forms a danger for people , animals and the environment .

[0011] A possibility that is sometimes applied is elevating such ammunition dumps with sand such that an arti ficial island is created . However, this does nothing to remedy the problem of the leaking ammunition, nor is this possible in some water bodies where shipping traf fic must remain possible , for example .

[0012] The purpose of the present invention is to provide a solution to at least one of the aforementioned and other disadvantages .

[0013] To this end, the invention relates to a device for removing ammunition from the bottom of a water body, whereby the device comprises an inner bell which consists of a chamber that is open at the underside and closed at the top by means of a roof and surrounded by a closed wall , whereby the chamber is configured to be positioned all the way on to the bottom or at a distance H from the bottom, whereby the device is further provided with means to ej ect the water from the chamber, whereby a gripper arm is provided in the chamber for picking up ammunition and depositing the ammunition ( 2 ) in a reservoir provided to this end, whereby the inner bell is provided with one or more overpressure valves or the like and whereby the device is provided with a bigger outer bell that is mounted over the inner bell , whereby the outer bell is provided with one or more overpressure valves or the like and whereby the overpressure valves of the outer clock are connected to a discharge pipe , whereby at a free edge on the level of the open underside the closed wall is provided with a broadening towards the outer clock, that extends in the plane of the open underside . The advantage of a device according to the invention is that ammunition on the bottom of a water body can be salvaged and cleared in a very simple manner and without danger for human health and the environment .

[0014] The ammunition can be collected and removed, after which it can be rendered harmless or dismantled in a controlled environment . The toxic or hazardous components can then be taken out and removed .

[0015] Using the device according to the invention entire ammunition dumps can be safely cleared .

[0016] The use of an outer bell over the inner bell ensures that in the possible event of an explosion of the ammunition in the inner bell the gasses that manage to escape between the bottom and the surrounding closed wall of the chamber due to the blast wave of the explosion are captured in the outer bell .

[0017] The purpose of the one or more overpressure valves in the chamber of the inner bell and in the outer bell is that in the possible event of an explosion of the ammunition, said overpressure valves open under the influence of the pressure build-up in the chamber and outer bell and that consequently the released gasses are discharged via the opened overpressure valves via the discharge pipe .

[0018] The discharge pipe can be passive or actively extract the gasses . Despite the fact that collecting the ammunition with the gripper arm is done in an extremely controlled and precise way, the device , using the overpressure valves , the discharge pipe and the outer bel l over the inner bell is equipped to ensure that no (hazardous ) gasses can be released into the atmosphere or mix or dissolve in the water in case of an accidental explosion of the ammunition or in case of damage to the housing of the ammunition .

[0019] As the water is ej ected from the inner bell , the vi sibility in the inner bell is considerably improved .

[0020] The advantage of the broadening of the closed wall at its free edge on the level of the open underside towards the outer clock is that the travel time of the released gasses in case of accidental explosions to the outer clock is extended by increasing the dispersion surface .

[0021] This means that the force and / or speed of said gasses will be weakened, which will further increase the safety .

[0022] Preferably, the aforementioned distance between the lower edge of the surrounding closed wall of the chamber and the bottom is between zero and one metre and ideally is between forty and sixty centimetres .

[0023] Such distance ensures a compromise between good visibility in the water and suf ficient distance between the lower edge of the chamber and the ammunition to be removed . It is indeed important to handle or move the ammunition as little as possible to not cause any unwanted explosions of the ammunition .

[0024] Preferably, the aforementioned means to ej ect the water from the chamber are formed by means to bring compressed air into the chamber . The pressure of the compressed air that is pumped or driven into the chamber will push or ej ect the water from the inner bell .

[0025] Preferably, the device is mounted on a floating crane , drilling platform or workboat from where the outer bell and the inner bell can be lowered all the way down on the bottom or at a distance from the bottom of the water body . In this way the device can be moved quickly and eas ily over the water body .

[0026] Preferably, the aforementioned discharge pipe on the floating crane , drilling platform or workboat is connected to a container or the like which is intended for capturing gasses from the ammunition . Said gasses can then be processed or made harmless in a controlled environment .

[0027] In a preferred embodiment , the inner bell is provided with one or more cameras . In this way the ammunition, the movements of the gripper arm and the reservoir can be remotely monitored or controlled .

[0028] Indeed, preferably the gripper arm is remotely operated, for example from the floating crane or drilling platform .

[0029] Said operation can be wired or wireless . With the intention of better showing the characteri stics of the invention, a preferred embodiment of a device and method for removing ammunition from the bottom of a water body according to the invention is described hereinafter, by way of an example without any limiting nature , with reference to the accompanying drawings wherein : figure 1 schematically shows a vertical cross-section of a device according to the invention .

[0030] The device shown in figure 1 for removing ammunition 2 from the bottom 3 of a water body 4 comprises an inner bell 5 which consists of a chamber 6 that is open at the underside 6a and closed at the top by means of a roof 7 and surrounded by a closed wall 8 .

[0031] The inner bell 5 is positioned at a distance H from the bottom 3 . In this case , said distance H equals fi fty centimetres . In practice , said distance H may vary between zero and one metre , but preferably said distance H is between forty and sixty centimetres .

[0032] In the case of this example three proj ectiles of ammunition 2 are present on the bottom 3 . It goes without saying that the number of proj ectiles as shown here is arbitrary .

[0033] The surrounding closed wall 8 of the inner bell 5 is provided with a gripper arm 9 , robot arm or other kind of gripper for gripping and moving the ammunition 2 to a reservoir provided to this end 10 . The ammunition 2 to be salvaged is collected in said reservoir 10 .

[0034] In this case , said gripper arm 9 and the reservoir 10 are provided against the surrounding closed wall 8 of the chamber 6 , but alternatively may also be mounted on or suspended from the roof 7 .

[0035] The device is provided with an outer bell 11 that is mounted over the inner bell 5 . The aforementioned distance H between the lower edge of the inner bell 5 and the bottom 3 equals the distance between a lower edge of the outer bell 11 and the bottom 3 .

[0036] According to the invention the closed wall 8 of the inner bell 5 is provided with a broadening 8b at its free edge 8a on the level of the open underside 6a . Said broadening 8b extends in the plane of the open underside 6a and extends towards the outer clock 11 .

[0037] In this case , but not necessarily, the broadening 8c is formed by a flat sheet 8c provided at the free edge 8a of the closed wall 8 .

[0038] Preferably, said sheet 8c is made from steel or metal .

[0039] Preferably, the broadening 8b is at least three times , and even more preferably, at least f ive times wider than the thickness of the closed wall 8 . The chamber 6 of the inner bell 5 and the outer bel l 11 are provided with overpressure valves 12 which open in case of a gas accumulation or accidental explosion of the ammunition 2 . The device 1 is intrinsically safe in case ammunition 2 were to explode unexpectedly .

[0040] The overpressure valve 12 of the outer bell 11 is connected to a discharge pipe 13 for discharging the gasses coming from the ammunition 2 in the case of a gas accumulation or explosion .

[0041] Said overpressure valves 12 may also be membrane valves or the like which open at a certain overpressure in the inner bell 5 and / or outer bell 11 .

[0042] Although in this example the overpressure valves 12 are provided in the roof 7 of the chamber 6 and on the upperside of the outer bell 11 , alternatively said overpressure valves 12 may also be located in the s idewalls or the surrounding closed wall 8 .

[0043] The device 1 is further provided with means 14 to ej ect the water from the chamber 6 . This means that in an operational condition of the device 1 , the internal volume of the chamber 6 is chiefly filled with air and that the internal volume of the outer bell 11 is chiefly filled with water .

[0044] In this example , the device 1 is coupled or mounted to a floating crane 15 . The outer bell 11 and inner bell 5 can be lowered and raised from the floating crane 15 . Alternatively, the floating crane 15 can also be a drilling platform or workboat , for example .

[0045] The discharge pipe 13 which is connected to the aforementioned overpressure valve 12 of the outer bell 11 in this example is connected or coupled to a container 16 that is located on the floating crane 11 .

[0046] Said container 16 will safely capture any released gasses coming from the ammunition 2 . Any released gasses flow according to the direction of the arrow in figure 1 , from the outer bell to the container 16 on the floating crane 15 .

[0047] In this example , the means 14 to ej ect the water from the chamber 6 of the inner bell 5 relate to a compressed air installation 17 located on the floating crane 15 .

[0048] Compressed air flows from the compressed air installation 17 on the floating crane 15 via a compressed air pipe 18 to the internal volume of the chamber 6 in the direction of the arrow shown in figure 1 .

[0049] In this way the compressed air ej ects the water in the chamber 6 . The air in the chamber 6 increases the visibility in the chamber 6 .

[0050] In this example the device 1 is provided with a camera 19 with which the ammunition 2 , the actions of the gripper arm 9 and the reservoir 10 can be monitored . The pictures coming from this camera 19 can be followed on the floating crane 15 for example .

[0051] In this way it is possible to remotely operate the gripper arm 9 . This operation can be wireless or wired .

[0052] In this case , the gripper arm 9 is equipped with a detector 20 for detecting, finding or locating ammunition 2 . Said detector 20 is a magnetoscopic or metal detector, for example .

[0053] Alternatively, such detector 20 can also be located elsewhere in the device 1 .

[0054] The operation of the device 1 is very simple and comprises the following steps :

[0055] A) lowering the outer bell 11 and the inner bell 5 down to the bottom 3 or at a distance H from the bottom 3 of the water body 4 ;

[0056] B ) ej ecting the water from the inner bell 5 ;

[0057] C ) collecting the ammunition 2 present on the bottom 3 with the gripper arm 9 ;

[0058] D) depositing the ammunition 2 in the reservoir 10 ;

[0059] E ) repeating the previous two steps until all ammunition 2 is collected in the reservoir 10 .

[0060] The method can be followed by one of the following additional steps :

[0061] F) moving the outer bell 11 and the inner bell 5 . G) raising the outer bell 11 and the inner bell 5 to the floating crane 15 , drilling platform or workboat .

[0062] The method can also be preceded by an additional step in which the device 1 is directed to a point where ammunition 2 is located on the bottom 3 of the water body 4 .

[0063] In the event of a possible explosion of the ammunition, the overpressure valves 12 will activate to discharge the escaped gases .

[0064] The gasses that escape into the outer clock 11 will have lost force and speed as a consequence of the broadening 8b and the created increased dispersion surface , such that they can be safely discharged because there is no risk of them escaping from the outer clock 11 .

[0065] Although the example described by way of an example shows three overpressure valves 12 , the invention is not limited to this . The number of overpressure valves 12 may deviate from this .

[0066] Alternatively, the overpressure valves 12 of the inner bell 5 may also be provided with a discharge pipe 13 that leads to the container 16 on the floating crane 15 or drilling platform .

[0067] Whereas in the example described and shown, the broadening 8b is executed as a flat sheet 8c, it is not excluded that the broadening 8b is realised by a thickening, which may or may not be gradual , of the closed wall 8 from the roof 7 toward the open underside 6a .

[0068] It is also possible that the entire closed wall 8 is executed in a thickened way, although such embodiment would result in an unnecessarily heavy device 1 .

[0069] The present invention is by no means limited to the embodiments described as an example and shown in the figures , but a device 1 and method for removing ammunition 2 from the bottom 3 of a water body 4 according to the invention can be realised in all kinds of forms and dimensions without departing from the scope of the invention .

Claims

Claims .1.- Improved device for removing ammunition (2) from the bottom (3) of a water body (4) , whereby the device (1) comprises an inner bell (5) which consists of a chamber (6) that is open at the underside (6a) and closed at the top by means of a roof (7) and surrounded by a closed wall (8) , whereby the chamber (6) is configured to be positioned all the way on to the bottom (3) or at a distance H from the bottom (3) , whereby the device is further provided with means (14) to eject the water from the chamber (6) , whereby a gripper arm (9) is provided in the chamber for picking up ammunition (2) and depositing the ammunition (2) in a reservoir (10) provided to this end, whereby the inner bell (5) is provided with one or more overpressure valves (12) or the like and whereby the device (1) is provided with a bigger outer bell (11) that is mounted over the inner bell (5) , whereby the outer bell (11) is provided with one or more overpressure valves (12) or the like and whereby the overpressure valves (12) of the outer clock (11) are connected to a discharge pipe (13) , characterised in that at a free edge (8a) on the level of the open underside (6a) the closed wall (8) is provided with a broadening (8b) towards the outer clock (11) , that extends in the plane of the open underside (6a) .2.- Improved device according to claim 1, characterised in that the broadening (8b) is formed by a flat sheet (8c) provided at the free edge (8a) of the closed wall (8) .3.- Improved device according to claim 1 or 2 , characterised in that the broadening (8b) is at least three times, and even more preferably, at least five times wider than a thickness of the closed wall (8) .4.- Improved device according to any one of the previous claims, characterised in that the aforementioned distance H between the chamber (6) and the ammunition (2) on the bottom (3) to be removed is between zero and one metre, preferably between forty and sixty centimetres.5.- Improved device according to any one of the previous claims, characterised in that the aforementioned means (14) to eject the water from the chamber (6) is formed by means (14) to bring compressed air into the chamber (6) .6.- Improved device according to any one of the previous claims, characterised in that the device (1) is provided with a floating crane (15) , drilling platform or workboat from where the outer bell (11) and the inner bell (5) can be lowered into the water body (4) .7.- Improved device according to claim 6, characterised in that the discharge pipe (13) is connected to the floating crane (15) , drilling platform or workboat.8.- Improved device according to claim 7, characterised in that the aforementioned discharge pipe (13) on the floating crane (15) , drilling platform or workboat is connected to a container (16) for collecting gasses coming from the ammunition (2) .9.- Improved device according to any one of the previous claims, characterised in that the inner bell (5) is provided with one or more cameras (19) .10.- Improved device according to any one of the previous claims, characterised in that the device (1) is provided with one or more detectors (20) for detecting or locating ammunition (2) .11.- Improved device according to any one of the previous claims, characterised in that the gripper arm (9) is operated remotely, in a wired or wireless way. 12.- Improved device according to any one of the previous claims, characterised in that the aforementioned overpressure valves (12) of the chamber (6) are provided in the roof (7) of the chamber (6) .

Images