MAINTENANCE SYSTEM FOR WATER BASIN SERVICE CHANNELS, SUCH AS OUTLET CHANNELS OR THE LIKE AND METHOD OF MAINTENANCE FOR WATER BASIN SERVICE CHANNELS, SUCH AS OUTLET CHANNELS OR THE LIKE

Description

DESCRIPTION of the Industrial Invention entitled: “Service Channel Maintenance System water basins, such as outlet channels or similar and method maintenance of water basin service channels 5 as output channels or similar” belonging to Deca Design Srl of nationality Italian, with headquarters in Via Vittorio Veneto, 158 / B, 32100 - BELLUNO (BL). Designated Inventors: 10 Alessandro Mutton, Alessandro Tona, Luca Savi, Mara de Cesare, All with elected domicile C / O Deca Design Srl Via 15 Vittorio Veneto 158 / B 32100 Belluno Deposited on Al Nr. ***************** DESCRIPTION TEXT Technical field of the invention 20 The invention relates to methods for performing cleaning and / or maintenance or restoration of service channels, in particular basin discharge channels water and equipment necessary for the carrying out such operations. 25 In particular, the invention relates to basins artificial water bodies with great depth. State of the art Currently the maintenance of the service channels in artificial reservoirs it takes place preferably 30 with empty pelvis, in particular but not exclusively when the depth of the basin is high, so the execution of operations that require direct intervention at least for some steps of supervision or human work is very risky if not impossible given the hostile environment. Over the years the outlet channels of the basins water bodies are subject to various types of decay such as 5 for example: - the accumulation of sediment inside the canal and the consequent reduction in flow capacity, for which said debris must be eliminated in order to maintain full functionality of the channel; 10 - growth of vegetation around the canal runoff such as trees and / or weeds that obstruct the flow from it and potentially block the channel, so these must also be eliminated to ensure that the channel is always 15 fully functional; - erosive phenomena caused by a constant flow in the drain channel due to leaks from the movable bulkheads, which means that the bottom of the canal is subject to to erosion that can potentially lead to a 20 malfunction due to structural instability of the channel itself, for which activities are necessary restoration of the bottom and / or walls of the canal same; - accumulation of debris such as fallen trees, branches, 25 waste and other things that can accumulate in the canal flow by preventing or reducing the flow section and potentially leading to outflow blockages and which debris must therefore be removed clearing the drain; 30 - structural damage due to aging, to the action of meteorological events or to imperfections or construction errors that may lead to breakages or discontinuities and therefore also to complete lack of functionality of the channel itself, for which restoration interventions are necessary structural of the canal itself. In maintenance by emptying the 5 basin, if on the one hand they are easily accessible the entrance opening(s) of the channels that normally they are immersed at certain depths, even at high ones, and if so the channel is easily accessible too internally from operating machines such as 10 earthmoving or similar while ensuring the maximum safety of the staff and thanks to the easy accessibility of the channel and the bulkheads as well as the the operating organs of the same also have a high quality of maintenance works as well as 15 checks, on the other hand, the emptying of the basin It involves first of all high costs and therefore losses considerable economic benefits. Furthermore, the emptying of the basin is incompatible with weather conditions when these are adverse and create management problems 20 of the water flows discharged from the basin downstream of the basin itself. Furthermore, the recovery times are relatively long and expensive. An alternative technique used in the state of art, provides that operations are carried out 25 dredging with full basin. High levels of pollution are avoided. costs caused by emptying the basin and the long recovery times, i.e. filling times of the basin. On the other hand this technique requires operations complex and expensive and normally access to the channel 30 exit and to the mobile bulkhead(s) provided in the itself is very difficult or even impossible. Description of the Invention The present invention therefore has as its aim the creation of a method and a system of maintenance of service channels to water basins, such as drain channels or similar, which method and the 5 which system allows to avoid the inconveniences of the techniques known to the state of the art, avoiding from one side of emptying the reservoir and then operating with a full pelvis and overcoming the limits of the techniques maintenance by dredging. 10 According to a first aspect, the present invention has as its object a method and a system that allows reach the bulkheads and the entire basin with a full basin extension of the canal up to the outlet opening in the basin, passing through the exit opening of the canal 15 planned downstream of the basin and with the canal in dry condition and effectively protected against a inflow from the basin. In a general embodiment, the invention has for object a method of maintenance of channels of 20 water basin service, such as outlet channels, or similar, which channels include an opening of entrance positioned below the water level contained in the basin under full basin conditions and which opening is in an immersed condition, 25 the said opening being provided in correspondence of its perimeter band of a sealed contact surface and at least two meters long vertical lateral edges of the said opening being respectively provided with a vertical guide with 30 u-shaped section open towards the central area of ​​the opening itself, optionally being a side wall of the guide a part of the perimeter band in a “u” shape estate, the said opening being connected to a service channel to the basin, which channel is permanently equipped with at least one movable bulkhead in 5 position retracted in the axial direction of the canal and for a predetermined distance from the underlying plane from the opening itself, the said bulkhead being associated with organs of shift that are command-operated to move 10 the said bulkhead from a closing position of the said channel in an open position and vice versa, the said method providing for the airtight closure of the said opening towards the inside of the basin for by means of positioning in correspondence with the said 15 opening of the service channel of an element of sealing closure which includes a band perimeter configured to engage in scrolling in the so-called vertical guides, so-called gargami, and the which band has a sealing gasket 20 designed to adhere tightly along the entire band sealing ring surrounding the said opening in condition of complete commitment of the said element in the said guides, the positioning of the said closing element 25 with the said gasket in contact with the said band of sealing of the said opening along the entire extension of the said gasket and of the said band and the optional compression of the said gasket in at least some points and / or areas or for the entire extension 30 of the same against the said annular sealing band of the said opening and which sealing element includes displacement and / or compression organs adjustable at least of the said gasket / s of the entire closing element with the said gasket against at least part of the said band annular, perimeter seal that surrounds the said 5 opening. The application of a removable bulkhead that closes sealing the service channel towards the inside of the basin by external application of the entrance opening of the service channel of a 10 removable floodgate made specifically It therefore allows you to operate in a channel of non-flooded service, i.e. substantially dry. Typically, the outlet opening of a canal it is expected downstream of the basin and at a lower altitude 15 at the height of the entrance opening of the said canal. The tight closure of the canal entrance opening placed in a submerged condition below the level of filling the basin allows access to the inside of the service channel from the exit opening of the 20 said service channel and also to be able to open the mobile channel control gates provided for in the same and then after having discharged the present water in the area between the closing element and the internal floodgates to the canal, to access even in dry conditions 25 of the canal to the terminal section of the same included between the said floodgates and the entrance opening. Typically the operating mode includes several steps preceding the installation of the element closure and which essentially consist of: 30 a step of preliminary investigation and inspection of the conditions of the opening and of any gaskets and sealing surfaces associated with the said opening and already present since they were made at the time of the construction of the said canal and of the said opening. Usually during the construction of the canal the creation of the opening of can be foreseen entrance with the perimeter sealing band that 5 surrounds and with one or two pairs of vertical guides for the commitment of temporary closure elements that are destined to be eliminated permanently after the construction of the canal has been completed; a step of preparation of the area of 10 intervention for the positioning of the element of closing in a sealed condition of the entrance opening to the service channel. This step may include the restoration of existing structures existing ones, such as the sealing ring that 15 surrounds the opening and / or a first and / or a second pair of the said opposing vertical guides or alternatively the creation of a new band perimeter fence surrounding the entrance opening to the channel and / or of a first and / or of a second of the 20 said pairs of opposing vertical guides; the next steps include positioning of the locking element in the correct position in relation to the pair or pairs of vertical guides and / or to the perimeter sealing band that surrounds the 25 said opening and also the possible load of the closing element, with its gasket perimeter against the annular sealing band that surrounds the entrance opening to the canal. These steps producing the isolation of the channel sector which is 30 delimited on one side by the closing element of the entrance opening and on the other side from one or more permanently planned bulkheads in the canal for the checking the opening or closing conditions of the canal itself and which are in a spaced position from the entrance opening towards the inside of the canal same; the opening step of the said bulkhead(s) 5 channel furniture to drain through the channel the water isolated in the above mentioned sector: carrying out maintenance operations, restoration and cleaning. Preferably these are performed using one or more operating machines 10 without command personnel on board and controlled by a remote station outside the service channel by remote control unit, preferably in combination with site display units intervention; 15 At the end of the said maintenance steps, they are the steps to restore the conditions are foreseen operational aspects of the service channel, which include the steps Of: closing of the mobile bulkhead(s) provided for in the 20 service channel; progressive flooding of the canal sector provided between the said sealing element on the entrance opening and the movable bulkhead(s) inside the canal; 25 complete removal or relocation of the element of closing the entrance opening in the non-position superimposed on the said opening to free the entire passage section; optional recovery of the locking element and 30 storage of the same. As regards the first steps of investigation and inspection, it is possible to use both human personnel like divers who acquire through video cameras images of the intervention area, or, when the conditions are particularly adverse for life human, it is possible to use bathymetric drones or similar devices configured to be able to run 5 shots of the intervention site. As regards the restoration works and / or reconstruction or construction of the sealing band ring that surrounds the opening and against which it must to adhere tightly to the gasket provided 10 from the closing element, as well as the guides or seats of vertical commitments intended to cooperate with elements of perimeter engagement of the closing element these work can be carried out by operating machines which carry one or more tools and which are prepared 15 to perform at least partially automatically and / or at least partly under direct control by personnel human and / or at least in part by remote control the said operations. Construction or reconstruction operations 20 may also include fixing steps in position of prefabricated frames that inscribe the said opening, form at least one or both of the pairs of opposing vertical engagement guides of the closing element and / or optionally also the 25 annular sealing band surrounding the said opening. In one embodiment of the method, the compression of the sealing gasket(s) provided on the closing element against the sealing band 30 surrounding the opening and at least for part of the extension of the said gasket(s) and / or of the this sealing band is exercised by means of organs push mechanics that act between a stop stationary and the rear side of the said element of sealing, that is, the opposite side at the opening. In an executive form that can be foreseen in 5 combination with one or more of the previous forms executive, the said stationary feedback is constituted from a further vertical guide with a “u” section open towards the center of the opening and which further guidance is parallel and alongside 10 respectively one of the said vertical guides of sliding of the said closing element and each of which further guides are intended to cooperate with a vertical row of positioning skates the which row is expected along each side edge 15 vertical of the sealing element and each of which rows consist of at least one pair of side skates vertically aligned with each other, each of which additional vertical guides is positioned at a certain distance from the associated guide 20 engagement of the sealing element on the side of the same opposite to the opening, while the said lateral skates are fixed to the said sealing element in a movable manner optionally progressively along a path with 25 at least one directional component parallel to the approach direction of the closing element to the perimeter sealing flange, annular which surrounds the said opening and to be regulated distance of the same from the corresponding lateral edge 30 vertical of the said sealing element and from exert a predetermined compressive force adjustable sealing element against at least a part of the said perimeter band of seal surrounding the said opening. In this case, the travel along the said at least one parallel displacement component to the direction of approach of the element of 5 sealing at the said opening, or at the perimeter annular sealing band that surrounds the itself must be such that a maximum distance must correspond at least to the distance of the guides verticals intended to engage the vertical sides 10 of the closing element from the vertical guides intended to engage the said rows of skates. Advantageously each skate of each row it can be moved along the said path independently from the other skates, although it is still possible 15 also provide variants in which all the skates are movable together and / or at least some of the skates are moveable together in groups comprising a number smaller than skates of the corresponding row. Regarding the creation of the guides 20 vertical sliding, all the said guides or only some of them can be shaped in a way to form shapes of invito in the initial section superior to the same or include elements that each constitutes an invitation flare. 25 In one embodiment, the method may include the step of extending upwards beyond the end upper of the said guides themselves and / or beyond the side top of the annular sealing band that surrounds the opening, one or more or all of the said guides 30 vertical sliding edges of the perimeter edge of the closing element and / or of the vertical rows of skates, with an extension segment of the respective guide which is shaped so as to generate an invitation to engage in the aforementioned guides. Alternatively or in combination with the said upper extension the method can also include the step of predicting a lower extension of the closing element and / or 5 of the vertical rows of skates which extension the lower one is optionally removable, i.e. separable from the closing element or which can be activated and deactivated and / or alternatively moveable from an active position of extension in an inactive position not 10 protruding beyond the lower edge of the element airtight closure. In one embodiment of the method, provided in combination with a drain channel which features, in position retracted with respect to the opening of 15 communication with the basin, two controllable bulkheads independently of each other in position closing and in the opening position of the said channel, It is planned to open the two aforementioned bulkheads in moments different time periods distant from each other after the element 20 closing has been brought into operational condition, the bulkhead furthest from the ship being opened first said opening and a cleaning of the intermediate area between the two said bulkheads, first of the opening of the second bulkhead. 25 The invention also relates to a system for the implementation of the above maintenance method of service channels of water basins, such as canals output, or similar, which channels comprise a entrance opening positioned below the level 30 of the water contained in the basin under basin conditions full and which opening is in condition immersed, the said opening being provided in correspondence of its perimeter band of a sealed contact surface and at least two meters long vertical lateral edges of the said opening being respectively provided with a vertical guide with 5 “u” section open towards the central area of ​​the opening itself, optionally being a side wall of each of the said “u” guides respectively one part of the perimeter sealing band that surrounds 10 the said opening along two vertical sides diametrically opposed, the said opening being connected to a service channel to the basin, which channel is permanently equipped with at least one movable bulkhead in 15 position retracted in the axial direction of the canal and for a predetermined distance from the underlying plane from the opening itself, the said bulkhead being associated with organs of shift that are command-operated to move 20 the said bulkhead from a closing position of the said channel in an open position and vice versa, the said system comprising an element of sealing of the said opening which includes a perimeter band configured for 25 engage in sliding in the said vertical guides, so-called gargami, and which band presents a sealing gasket intended to adhere tightly along the entire sealing band surrounding the said opening, in a condition of complete commitment of the said 30 element in the said guides, and which sealing element further includes compression organs adjustable of the said gasket against at least one part of the said annular, perimeter sealing band surrounding the said opening. According to one feature, the said element of sealing is provided in combination with one or 5 more compression actuators in the form of organs push mechanics that act between a stop stationary and the rear side of the said element of sealing closure, that is, the side opposite the opening and opposite to the one that carries the said gasket 10 estate. One embodiment provides that the said finding stationary consists of an additional guide vertical with a “u” section open towards the centre of the said opening and which further guidance is 15 parallel and adjacent to one of the said vertical sliding guides of said element closing and each of which further guides is intended to cooperate with a vertical row of skates of positioning, which row is planned along 20 each vertical side edge of the element of airtight closure, while each of the said rows is consisting of at least one pair of lateral skates vertically aligned with each other and spaced apart from each other in a predetermined amount, each of which additional 25 vertical guides are positioned at a certain distance from the associated element engagement guide sealing on the opposite side of the same at the opening, the said lateral skates of each row 30 vertical being fixed to the said closing element held in a movable manner along a path with at least one directional component oriented in direction of approach and departure of the said perimeter seal towards and from the said band perimeter sealing ring that surrounds the said opening or at least part of it by exercising a preset adjustable compression force 5 of the sealing element against at least one part of the said perimeter sealing band which surrounds the said opening and alternately cancelling the said compressive force. According to another feature that can be 10 expected in combination with the previous one each of the said skates of the said vertical rows of skates, is mounted adjustable relative to the distance of the same, from the corresponding vertical lateral edge of the said sealing element, or to the 15 relative position with respect to the said lateral edge vertical between a plurality of positions in which the said skate protrudes beyond said vertical edge and at least one extreme position in which the said skate is withdrawn towards the central band of the element of 20 closing in a position where it does not protrude beyond the said vertical lateral edge of the element of airtight closure. According to a further feature of the system according to the present invention which can be foreseen 25 in combination with one or more of the above features the upper extremities of at least some or all vertical guides are shaped so as to form a flared invitation enlargement or include an invitation flare. 30 An executive variant provides that one or more of the said vertical guides is associated a upper extension, which extension is fixable in a stable or removable manner, the said extension being shaped as an extension of invitation of the closing element and / or the rows of lateral skates, vertical in the said guides vertical. 5 This executive variant can be constituted as the upper terminal element of a frame fixable in position at the said opening and which frame includes at least two vertical uprights each of which forms one of the 10 two opposing vertical guides being called uprights equipped with a channel cross-section and said vertical uprights being provided on the sides diametrically opposed to the said opening, the said frame further comprising 15 additional perimeter elements intended to form perimeter sealing band segments perimeter ring seal that surrounds the said opening, and which frame can be fixed tightly around 20 at the said opening. Alternatively or in combination with one or more of the previous variants, the closing element is equipped with a lower centering extension in the said vertical guides both those in which 25 directly engage the vertical edges of the element closing and alternatively or in combination those in which the vertical rows of skates are engaged lateral, which lower centering extension 30 carries at least one sliding shoe for each side vertical of the closing element and which extension and / or the skates of the same are alternatively activated and deactivated. In an executive form that can be foreseen in combination with one or more of the previous forms executive and / or variants, the said extension lower engagement consists of a fixed frame 5 in a movable manner from an active, protruding position beyond the lower edge of the said sealing element and an inactive position in which the said frame is in position not protruding beyond the lower edge of the closing element, in fully closed position 10 retracted inside the perimeter edge of the same, to the said frame being coupled at least one engagement skate at one side vertical of the same, and which skate is mounted cantilevered on a support that can be moved from one position 15 active of the said skate in which the same protrudes from the vertical edge of the frame to such an extent as to be aligned with the row of skates along the corresponding vertical edge of the element closure and to be committed to the corresponding guide 20 vertical, in an inactive position where the said skate is in the retracted position with respect to the corresponding vertical edge of the element closure. In an executive variant, the said frame is 25 pivoted to the lower area of ​​the rear side of the closing element in an oscillating manner with respect to to a horizontal axis and / or parallel to the lower edge of the said closing element and can be folded down by a inactive position where it is fully positioned 30 hidden behind the back side of the said closing element and not protruding beyond the edge perimeter of the same, downwards, in a position in which said frame protrudes downwards beyond the lower edge of the said element of closure, and in which position the skate(s) carried by the same are movable in position aligned vertically below the skates 5 each vertical row of skates along the two opposite vertical perimeter edges of the closing element. In combination with the shapes and variants executives illustrated above, at least some, preferably all the skates that form the rows 10 vertical skates are mounted on one arm extendable and retractable with respect to the vertical edge side of the closing element and respectively in the direction of commitment and disengagement in and from corresponding vertical guide. 15 Furthermore, in combination with the above feature, at least some, preferably all support arms are mounted on movable supports of movement of the said arms along a path rectilinear or curvilinear of departure or departure 20 approach to the rear side of the said element of sealing closure, i.e. on the side of the said element closure opposite to the side bearing the gasket perimeter, sealing ring. There can be different configurations 25 constructions of a closing element which presents a combination of one or more of the previous forms and / or executive variations. In a preferred construction form, the element of closure includes a plate with a perimeter shape 30 shaped to carry along the perimeter edges of the same at least one sealing ring gasket intended to cooperate with the sealing ring which surrounds the said opening, while on the opposite side to the one that carries the said annular gasket, the this plate is provided with a central frame, vertical reinforcement to which they are pivoted in a way oscillating around a vertical and / or parallel axis 5 to a vertical perimeter edge of the said slab two or more transverse, or horizontal, arms, the which arms are made respectively extendable and retractable in the direction of their longitudinal extension and which arms lead to the 10 their free end opposite to the fulcrum end at least one skate, while pushers are provided interposed between the said arms and the rear side of the said plate which engage the respective arm at an intermediate point which is provided at a 15 certain distance from the fulcrum end and from the end that carries the skate. According to yet another feature that can be foreseen in combination with any of one or more of the above mentioned forms and executive variants 20 described, in at least one area of ​​the central belt of the sealing element, or of the said plate, is a passage opening is planned, to prevent flooding in combination with a shut-off and opening valve of the said window. 25 Still according to a further of the system that can be foreseen in combination with one or more of the previous forms and / or executive variants, the channel of exhaust presents, in a recessed position with respect to the communication opening with the basin, two bulkheads 30 independently controllable in closed position and in the opening position of the said channel, being a control station for opening the doors is planned said two bulkheads which is configured to open the said two bulkheads at different times after that the closing element has been brought in operating condition, being opened first bulkhead furthest from the said opening and coming 5 performed a cleaning of the intermediate area between the said two bulkheads, before the second bulkhead opens. The system according to one or more of the forms and / or previously described executive variants can foresee in combination with the said element of 10 closure of construction and / or restoration organs alternatively or in combination of the said annular sealing band that surrounds an opening of a service channel; and / or one or more of the vertical guides of 15 sliding of a closing element and / or guides scrolling verticals of one row respectively vertical of skates provided on each vertical side of the closing element. In one embodiment, the said organs of 20 construction and / or restoration consist of at least a support frame of one or more slide guides more milling, sanding and / or one or more tools mortar application nozzles, which frames of support are provided with fixing elements in 25 position corresponding to the sealing band that surrounds the opening and / or one or more of the said guides vertical. Still according to a further characteristic that can be foreseen in combination with one or more of the 30 previous forms and / or executive variants, the said system includes operating machines, preferably remote controlled, for material removal accumulated inside the channel and / or for the application of coating and / or restoration of the walls of the said canal. According to an executive variant, at least one operating machine includes one or more heads 5 tools for collecting and / or grasping debris or other material, a subsequent conveyor belt that extends in the longitudinal direction of the said operating machine and on which the said collection organs and / or grab discharge the collected debris and the 10 which conveyor belt ends in a container of collection arranged upstream or downstream of a unit of motorized traction being the said machine operator equipped with a control unit remote-controlled by a remote control unit 15 remote. From the above it is clear that advantages of the method and system according to this invention. These essentially consist of a reduction of overall costs of interventions 20 maintenance, at least in the reduction, if not in the total elimination of recovery times operation of the basin, in the notable increase in safety in carrying out operations maintenance, being the possible critical phases for 25 safety limited to the preparation phases, of positioning and commissioning of the element closure, as well as in the removal phases of the same. Also, once the band is restored annular, perimeter seal that surrounds the opening 30 of channel entry and sliding guides verticals of the closing element as well as any engagement guides for vertical skate rows of the sealing element, the operations of canal closure and emptying require only the repositioning of the element of closing at the opening and the phases of emptying of the segment between said closing element 5 and the movable bulkheads, which makes it much faster and facilitates the preparation of the canal for execution maintenance operations and therefore called operations can be performed at intervals of less time than what is done 10 currently using the methods and systems according to the state of the art. List of figures and brief description of them Executive examples, not limited to, of this invention are illustrated in the figures listed below. 15 followed: Figure 1 schematically illustrates a wall of a dam in which at the bottom of the a canal is planned for the basin formed by the said dam exhaust with an inlet opening. 20 Figure 2 shows a drain channel in which two mobile floodgates are planned which are permanently mounted in the same and which are movable alternatively in a closed position of the channel and in an open position of the same. 25 Figure 3 shows an example of an opening of entrance of a service channel planned in the area of the bottom of a reservoir. Figure 4 and Figure 5 show two views in perspective of a closing element with direction 30 views from the left and right respectively and on the rear side of the said closing element. Figure 6 shows a plan view on the side rear of the closing element according to the figures 4 and 5. Figure 7 shows a side view vertical of the closing element according to the previous figures 4 to 6. 5 Figure 8 shows a plan view on the side front of the closing element provided with the sealing gasket against the perimeter band of seal surrounding the opening. Figure 9 shows a top side view 10 of the closing element according to the previous figures 4 to 8. Figures 10.1 to 10.15 show the sequence of installation steps for a engagement frame closing element at an opening 15 of a channel, which frame surrounds the said opening and is intended to restore both guides vertical engagement of the closing element and both at least part of the perimeter sealing ring which surrounds the said opening and against which it is intended 20 to adhere tightly to the provided gasket on the closing element. Figures 11 to 18 show views of a sequence of assembly steps of a closing element according to the present invention in combination with a 25 first executive form of realization of the guides verticals of engagement of the lateral rows, verticals of skates provided on the said closing element, and in of which the said vertical guides are made up of respectively a profile mounted on sides 30 diametrically opposed to the opening being expected a higher extension of centering and invitation of the closing element. Figures 19 to 24 show views of a sequence of assembly steps of an element of closure according to the present invention in combination with a first executive form of realization of the vertical guides for engaging the lateral rows, 5 vertical skates provided on the said element of closure, and in which, the said closing element It features a centering and invitation frame provided protruding from the lower side of the same and made can be activated and deactivated. 10 Figures 25 to 26 show two views of enlarged details of the said extension lower according to the previous figures 19 to 14. Figure 27 shows an example of a machine operator for the restoration of the annular band of 15 seal surrounding the opening and one or both of the pairs of vertical guides. Figure 28 shows an enlarged view of machine details according to figure 27. Figures 29 to 33 show some executive examples 20 remote-controlled cleaning machines and the restoration of a channel and a station remote control. Detailed description of illustrated executive examples in the figures 25 Figure 1 shows a schematic section of a wall of a dam that delimits a reservoir. In the said wall there is a channel at the bottom exhaust 1 which communicates with an inlet opening with the basin and remains completely submerged by water. 30 In figure 1, an element of is also shown sealing of the said opening of the channel exhaust 1 which is globally indicated with 10 and which is placed in the operating condition of sealed closure of the said entrance opening. The closing element it is secured to a guide cable with which it is lowered in the pelvis to be brought into operational position. Also illustrated is an umbilical tube of 5 connection, which in this case powers one or more operating units with a hydraulic fluid of drive. Figure 2 shows an example of a section through an end part of a canal 10 service 1 in which two movable bulkheads are mounted to seal the channel. The two bulkheads are operated relative to the movement in the closing position of the passage section of the channel 1 and in the open position of the said 15 passage section, independently of each other on the other hand by motorized actuators which are controlled from a remote control station (not shown). two floodgates 2, 3 are planned inside the canal at a certain distance from the entrance opening 4, for 20 between which and the said opening 4 extends a terminal segment of a channel of predetermined length. Figure 3 shows a schematic example of an entrance opening of a channel 1 according to the previous figures. As it appears from the figure, the said 25 opening has a perimeter band, annular 401 which in operating condition forms a sealing band for a gasket of a non-closing element illustrated in figure 3. Furthermore, in the example of the figure 3, the sealing band has two branches 30 vertical or substantially vertical ones that are expected on diametrically opposite sides of the said opening and each forming a side wall of a guide vertical 5 of sliding engagement of a corresponding vertical perimeter edge of the closing element in the condition of being put into operation work. The two guides have a section channel or “U” shaped and are facing with the open side towards 5 the entrance opening 4 placed between them. According to yet another feature, the this opening is provided in combination with a further pair of vertical guides 6, “U” shaped, which are positioned substantially vertically 10 coinciding with one of the two guides respectively vertical sliding for the closing element on the side of the same opposite to the one facing the opening 4. The vertical guides 6 are provided at a 15 preset distance from the sliding guides vertical 5 and as it will appear in more detail in are subsequently intended to cooperate with at least one lateral skate, or with a vertical row of two lateral skates provided in correspondence with each 20 vertical edge of the said closing element. The said vertical guides 6 for engaging the corresponding skates, have the function of constituting for said skates positioning checks stationary which allow, thanks to an assembly of the 25 skates themselves adjustable in relation to the distance from the closing element to generate a reference correct positioning of the closing element with respect to the 5 cooperating sliding guides with the same and in fully assembled condition 30 of the said closing element to generate forces of locking in position and / or compression of a sealing gasket carried by the said element seal against at least part of the band 401 surrounding annular sealing perimeter the opening in order to safely ensure a stable and airtight positioning of the element sealing against the said opening. 5 Figures 4 to 9 show different views of a executive example of a sealing element according to the present invention and which is configured to operate in combination with an opening configured as in the example in figure 3. 10 The sealing element 10 comprises a panel or a closing plate indicated by 110. This plate or panel has a shape in plan corresponding to the shape in plan of the opening and an extension such that they cover 15 outwards completely the passage light of the said opening, while the said plate or the the said panel has on the side intended to be facing the said opening in condition of assembly of a sealing gasket 111 which has 20 a trend consistent with the annular sealing band 401 surrounding the said entrance opening 4. Without this constituting a limitation of the general concept, but only one solution preferred example, in this example the 25 sealing gasket 111 is rectangular in shape and congruent with the shape and size of the band sealing ring 401 surrounding the opening of entrance 4 as shown in figure 3. Also the panel or plate 110 is rectangular in shape and 30 has two vertical edges and two horizontal edges. Furthermore, while the sealing ring 401 surrounding the opening extends along a plane transversely oriented, in particular perpendicularly, with respect to the axis of the said entrance opening 4, the lower side of the said band forms a sealing surface with at least one directional component parallel to the axis of the said 5 opening, being the sealing surface of the corresponding gasket part 111 on the panel or on the correspondingly oriented plate 110. The back side of the said plate or the said panel 110, i.e. the side opposite the opening 10 has a reinforcing frame, made up of an element fixed along a central band, substantially parallel to the perimeter edges intended to assume a vertical position or essentially vertical in the assembly condition 15 on the opening. Laterally to the said frame central reinforcement indicated with 112, the same is extends towards the two lateral, vertical edges of the said plate or said panel 110 with a plurality of 113 lateral ribs which are spaced apart from each other. 20 In the illustrated embodiment the said ribs transversal ones are triangular in shape and have a protrusion from the rear side of the panel and the larger plate at the end of connection to the central reinforcement frame which 25 degrades to zero towards the corresponding edge vertical side of the said plate or of the said panel 110. In an intermediate position between all or some of the transverse ribs 113, on each of the two opposite sides 30 verticals of the central reinforcement frame 112 is articulated in 116, oscillating around a axis substantially parallel to the corresponding side vertical articulation of a swing arm transverse 114 which leads to its opposite end to that of articulation a terminal with function of engagement element or engagement skate 115. The skates of commitment 115 are shaped and sized in such a way 5 to be engaged in a corresponding engagement guide 6. The transverse arms, oscillating 114 are movable along the angular path of oscillation in the direction of approach and departure from the 10 back side of the plate or panel 110 thanks to actuators 117. These actuators can be of motorized type and also optionally operable by remote control or they can be manually operated type, or alternatively it is 15 possible to foresee combinations of actuators operated from a motor and manually operated actuators. In the example illustrated the said actuators 117 of angular displacement of the wishbones 114 consist of a threaded rod fixed118 with 20 one end rotatable around its own axis, by means of a rotating support 119, to the side rear of the plate or panel 110 and which is extension through the corresponding arm transverse oscillating 114 engaging in a 25 nut screw 120 supported oscillating by the said arm 114, protruding to a predetermined extent from the side of the corresponding transverse arm, oscillating 114 and ending with a solidary 121 gripping organ by rotation with said threaded rod 118. The rotation 30 in a first direction and in a second direction contrary to the first of the grasping organ 121 determines the rotation of the threaded rod 118 and of consequence of the displacement of the transverse arm in direction of approach or departure from the side rear of the plate or panel 110. The length of the wishbones 114 can be fixed and such that the overall distance 5 between the outermost surfaces of two opposing arms oscillating transverse 114 is substantially corresponding to or slightly less than the distance of the bottom sides of the two opposing vertical guides 6 of engagement of the said engagement skates 115. 10 According to an executive variant not illustrated, the said transverse, oscillating arms 114 can also be made extendable and shortenable and / or said engagement shoes 115 can be fixed in adjustable way with respect to the fixing position 15 on the terminal end of the corresponding arm 114, so as to allow for adjustment of the position of the individual skates 114 in relation to the corresponding vertical perimeter edge of the plate or panel 110. 20 As shown in the illustrated example the element of sealing closure can be provided with two or more arms, in particular three transverse arms, oscillating 114 for each side that form respectively a row of 115 engagement skates between 25 of them vertically aligned and having a position substantially identical to the said corresponding vertical perimeter edge of the plate or panel 110 with reference to a transverse direction. 30 In this description, three arms are foreseen transverse, oscillating 115 for each edge vertical perimeter of the slab or panel 110 which are distributed along the longitudinal extension of the said vertical perimeter edges in such a way, whereby a pair of opposing arms 114 is expected closer to the lower perimeter edge and a pair of opposing arms 114 closer to the 5 upper perimeter edge of the panel or sheet 110, while an intermediate pair of opposites arms 114 is provided in an eccentric position with respect to to the upper and lower pair of arms, plus close to the lower pair of arms compared to the 10 pair of upper arms. In this description the term vertical referred to the sealing element is always relating to the installation position, or positioning it against the opening or during 15 the positioning phase against the said opening. The indications of should be interpreted in a similar way: orientation defined as horizontal or transversal. The closing element can in fact take on non-operational condition any orientation 20 spatial and therefore not have a defined orientation. Even with regards to the position in condition of implementation, this position may not be expected to be perfectly vertical, but it can be even along an inclined plane in a predetermined 25 measure and in a predetermined direction, forward or backwards, with respect to the perfectly orientation vertical. In this case both the sealing band and surrounds the opening and either the pair or pairs of guides verticals 5, 6 can be correspondingly 30 inclined or arranged on an inclined plane having the said pre-established inclination or define a said inclined plane. As a consequence of the above, the terms also upper and lower always refer to the position of the closing element in the condition positioning against the said opening of the canal or during positioning operations against the 5 said opening. Always referring to figures 4 to 9, in a intermediate position of the plate extension or panel 110, a through window is provided flooding indicated by 122. 10 A valve is associated with this opening 122 opening and closing indicated globally with 123. According to an optional feature, next to the entrance of the said valve is associated with a grid 124 filtering which prevents that in conditions of 15 opening of the flood window 122 the incoming flow may also carry debris inside channel 1 and as we will see later inside the canal segment between the sluice gate 3 of closing closest to the opening and the said 20 closing element. Thanks to this opening of flooding is possible to generate pressure hydrostatic substantially identical on both sides of the closing element and thus allow it moving away from the opening to restore the 25 full passage section of the same and the conditions service channel project operations. The valve actuation can be of the following type: motorized, with remote control and / or type motorized with local and / or manual control 30 similarly to the possible alternatives envisaged for the movement of the swinging wishbones 114. In the example of figures 4 to 9, the drive is hydraulic type as shown by the actuators indicated with 126 and 127. According to a possible variant shown in the executive form of figures 4 to 9, at the end lower part of the sealing element is provided 5 a lower extension frame 20. This frame is fixed to the rear side of the sealing element, for example at the lower end of the central frame of reinforcement 112 in a movable manner between a position of 10 work, that is, in which it is active, in which it protrudes inferiorly beyond the lower transverse border of the plate or panel 110, in a position inactive, in which it is positioned completely behind the said panel or said plate 110 and does not protrude beyond 15 the said lower edge of the same. In the embodiment illustrated, in particular an executive variant is shown in which the said lower extension frame 20 is pivoted at 201 at the lower end of the central frame of 20 reinforcement 112 and can be swung into one position essentially vertical where it protrudes beyond the edge lower part of the said panel or plate 110 in a position where it is completely overturned behind the said plate or the said panel 110 and not 25 protrudes beyond the lower edge of the same. The said extension frame carries in correspondence of its opposite end to that of fulcrum two transverse arms, 202 and 203 which are made to be extended or shortened in the direction 30 of the longitudinal axis of the same and that at their each end carries a centering shoe 204 intended to engage in a corresponding guidance of the pair of vertical engagement guides provided for the rows of engagement skates 115. In the illustrated embodiment the arms transversals 202, 203 can be extended or shortened telescopically being a first tubular segment 205 5 fixed to the frame and a second segment of arm engaged in sliding in direction longitudinal of the corresponding first segment 205, while the sliding segments of the arms 202, 203 are lockable in position with respect to segment 205 from 10 locking organs 206. In the executive form illustrated the said locking organs 206 are consisting of a transverse pin which engages on one side apart from a transverse hole of the fixed segment 205 of the arm 202, 203 and a through hole provided on the 15 movable segment that is part of a longitudinal row of through holes provided at pre-established distances between them along the said mobile segment. In the example illustrated the centering pads 204 have a T-section with a rib 20 protruding axially with reference to the axis of the corresponding arm and intended to engage in a corresponding vertical guide 6 and with a wall of insertion limit switch intended to stop against the lateral edges that delimit the compartment of the 25 said commitment guide 6. In the active position of the lower extension of centering 20, the transverse arms 202, 203 are extended so as to present a distance between the free ends of the centering shoes 204 of the 30 same substantially corresponding to the distance between the vertical centering guides 6 and in such a way so that the said centering pads 204 are vertically aligned or vertically alignable with the row of skates of commitment 115 expected on each vertical side of the plate or panel 110. In the upper end area of ​​the plate or of panel 110, the central reinforcing frame 5 112 extends beyond the upper transverse edge of the plate or panel 110 with a terminal of 125 fixing for connecting the element sealing of one or more towing cables, or similar, not illustrated. 10 With reference to the extension frame lower 20, this is optional and the forecast of the same depends on the executive variant used for the creation of the vertical engagement guides as will be described in more detail below. 15 In an executive form at least one of the two pairs of vertical guides 5 and / or 6, is made by applying in a place provided in the walls that delimit laterally the opening 4, respectively a guide consisting of a channel profile indicated with 60. 20 Figures 10.1 to 10.15 show different steps of assembly of the said profiles 50 and / or 60 in the corresponding locations and commitment of the element of closure in the same. Figures 11 to 18 show some details of the 25 assembly procedure of the element on site airtight closure. Figures 10.1 to 10.5 show a lot of schematically the operations of lowering the profiles to channel 60 and assembly in the corresponding locations. In 30 this case the aid of in is shown diver, however this is just an example, since it is also possible to foresee remote-controlled means when the working depth is very high. In figure 10.6 the two 60 channel profiles are positioned in the vertical millings that form the seats in the walls on the sides of the opening and in position protruding to a certain extent the said profiles 5 protrude above the upper side of the opening 4 with an extension respectively longitudinal which constitutes an extension of invitation and centering of the skates of the rows of skates vertical lines planned along the vertical side edges 10 of the closing element, as shown with reference to the executive example of the previous ones figures 4 to 9. In this example, but not limited to, the guides 5 vertical sliding edge engagement 15 vertical, perimeter of the slab or panel 110 They are instead made from grooves or grooves obtained in the vertical walls that delimit laterally the opening being the assembly of the channel profiles 60 only intended for vertical centering guides 20 6 intended for engagement with the vertical rows of skates 115. The sealing element is lowered for by means of ropes or cables and brought into position such as to progressively engage the couples one after the other 25 of opposing skates of the two lateral rows, vertical skates in the upper extensions 61 of the said profiles 60, until complete positioning in the sealed condition of the opening as shown in figure 10.13. 30 Thanks to the possibility of moving the arms oscillating transversals in approach and in moving away from the plate or panel 110, is possible to progressively adjust the position of distance of the said skates 115 with respect to the corresponding vertical, perimeter edge of the panel or plate 110 when the element of sealing is still only engaged in 5 upper centering and invitation extensions 61. This adjustment allows you to position the vertically coinciding with the pairs of guides vertical scrolling 5 the vertical edges of the panel or plate 110 and consequently the 10 sealing gasket carried by the said plate or by the said panel 110 with the annular sealing band which surrounds the opening. In this way when the first pair of opposing skates 115, lower reaches 15 the lower end of the centering extensions and invitation 61, at least the lower edge of the panel or of plate 110 is coincident with the corresponding ones vertical sliding engagement guides 5. Figure 11 shows in detail the condition in 20 which the pair of opposing lower skates 115 is inserted into the entrance end of the centering and invitation extensions 61 of the 60 profiles that form the two vertical guides of commitment 6. 25 Figure 12 shows an intermediate condition of engagement of the sealing element in which the lower pair of opposing engagement pads 115 has already entered the corresponding centering guides 6 as well as a lower section of the plate or the 30 panel 110 is engaged with the perimeter edges vertical in the corresponding vertical guides of commitment 5. Furthermore, the pair of opposing skates of commitment 115 expected in intermediate position of the panel or plate 110 is about to enter the upper ends of the centering extensions 61. Figure 13 shows an assembly condition further advanced in which in the extensions of 5 upper centering is also engaged the couple upper of opposing skates 115, for which the locking element has almost reached the position final positioning with respect to the opening. Figures 14 and 15 show the closing element 10 held in the final positioning position relative to opening 4. As shown in particular in figure 15, the branches vertical and upper gasket 111 are facing the corresponding segments of the 15 sealing ring 401 surrounding the opening, while the said band has a branch substantially horizontal along the lower segment on which it adheres a gasket is provided on the lower edge to seal of the panel or sheet thanks also to the weight 20 of the closing element itself. Figures 16 to 18 show the adjustment steps of the distance of the transverse arms, oscillating 114 relative to the rear side of the panel or plate 110, so as to exert a force of 25 compression of preset intensity of the said plate or of the said panel 110 and consequently of the gasket 111, and in particular at least of the branches vertical and upper transversal of the same against the corresponding segments of the sealing band 30 ring 401 surrounding the opening 4. In the example illustrated the movement of the arms transverse, oscillating 114 occurs through manual operation of the moving parts, However, as previously indicated, such movement can occur via actuators motorized, remotely or locally controlled. From figures 16 to 18 it is clear how the said 5 arms are moved progressively from one position of shortest distance of the skates 115 from the panel or from plate 110 to an intermediate position up to the final position of maximum distancing of the skates 115 from the plate or panel 110 in which 10 the seal is guaranteed and the positioning stability of the locking element. Figure 15 also clearly shows the flood vent and associated relief valve closing and opening of the same. 15 Figures 19 to 24 show the executive variant where the centering of the closing element takes place by means of the lower centering extension 20 and in this case also in the conditions in which the two pairs of vertical guides 5 and 6 respectively for the 20 plate or panel 110 and for the two vertical rows side of skates are made up of grooves or grooves made in the wall material on the two sides of the opening itself. As shown in figure 19, the frame of 25 lower centering extension 20 is brought in the protruding position below the edge lower perimeter of the panel or plate 110 and with the 204 centering pads aligned vertically with the corresponding row of skates 30 commitment 114. Figures 19 and 20 show the operations of extension of the two opposing telescopic arms 202, 203 to bring the said centering shoes 204 in position vertically coinciding with the extremities of the upper entrances of the corresponding guide vertical centering 6. Once arms 202, 203 have been 5 locked in the correct extension position, the closing element is lowered progressively as in the previously described executive example, and thanks to the said centering extension frame 20, it is possible to obtain a centering of the 10 panel or plate 110 with the corresponding guides verticals of commitment 5, for which decreasing progressively the sealing element is the engagement skates 115 of the two rows of skates lateral engagement, both the panel or the plate 110 is 15 correctly place them in the corresponding pairs of vertical guides 5 and 6. Once you reach the correct position of the closing element similarly to what shown in figures 14 to 18, the following are performed: 20 steps to adjust the skate gap 114 with respect to the panel or plate 110 in order to compress the gasket against the sealing band surrounding the opening and blocking the element of seal in this position. 25 As shown in figures 23 and 24, once the panel or plate 110 and at least a first pair of opposing engagement skates 114 has been inserted in the corresponding pairs of vertical guides 5 and 6, the centering extension frame 20 is 30 brought into the inactive position where it does not protrude beyond the bottom edge of the plate or panel 110 and in which position it can come temporarily blocked. As shown in figures 23, 24 and 25, 26, the arms telescopic 203 and 204 are brought from the position extended shown in figure 25 in detail in retracted position shown in the detail figure 5 26 and also in figures 23 and 24. According to a further feature of the invention which can be foreseen in any combination or subcombination with one or more of the previous features, an initial stage of the 10 method according to the present invention provides the execution, when necessary, of operations restoration, reconstruction or construction from scratch of features associated with the 4 and in opening particular relating to the construction and / or 15 grinding of the sealing surfaces of the band perimeter seal surrounding the opening and against to which the gasket provided must adhere on the sealing element and / or on the reset, the reconstruction and / or construction from scratch of shoulder pads 20 lateral, vertical on the two diametrically opposite sides of the opening and / or restoration, reconstruction and / or the new construction of vertical guides 5 and / or 6. These operations can be performed by operating machines that can be controlled remotely and are 25 positioned relatively to the opening similarly essentially to the 50 or 60 profile shapes executive according to figures 10.1 to 18. An example of such a thing is shown in figure 27. automatic and remotely controllable operating machine. 30 This comprises a positioning frame 70 which constitutes a positioning and guidance body of a plurality of tools 71. In the example the tools They consist of cutters that can be moved along the various branches of the 70 frame. However, it is possible to foresee alternatively or in combination also tools for the jetting of material such as concrete or the like comprising at least one nozzle that is movable 5 along at least some of the said branches of the frame 70 and that is supported to present at least one additional degree of freedom or several additional degrees of freedom a control unit being provided in combination which manages the progressive deposition of cords of 10 material in such a way as to generate structures three-dimensional shaped according to pre-established structural configurations. In figures 27 and 28, the frame of positioning of the operating machine frame 70 15 is intended to engage in the vertical guides 6 with its vertical uprights 72. Along the uprights are fixing organs 73 are foreseen in the corresponding vertical guide 6, while translation guides such as the vertical guide 74 are carried on integral shelves 75 20 to the uprights of the said frame 70. The guides of translation for one or more tool trolleys are movable and adjustable mounts in position along the said shelves 75 which can also be locked in position set. 25 As is evident from figure 27, a guide translation is also foreseen along the crosspiece upper 76 of the said frame 70. Figures 29 to 33 show different executive forms of operating machines for the execution 30 of the maintenance operations within the said channel. These operating machines are preferably remotely controlled, from a remote control station of which figure 30 shows a possible executive example. The operating machines shown in figures 29 and 31 to 33 can also operate in tandem as shown in figure 29. 5 The remote control station can be in container form and present the dimensions external of a container. The control station can include a compartment 80 in which the units are housed of energy management processing of 10 external environment air conditioning power supply and communication units. In a compartment 81 there are one or more workstations remote control, each of which includes a monitor of displaying images transmitted by one or 15 more cameras positioned in one or more points of the operating machines and one or more control organs and / or for entering and / or selecting commands and / or information to be transmitted to the operating machines for the execution of maintenance operations for which 20 are expected and / or for the entry of information of configuration of the said machines and / or pre-execution requests for measurement of functional parameters. Communication with operating machines can be both radio and cable, being 25 this last communication method particularly indicated when the channel has lengths relatively large and the position of the bulkheads furniture with respect to the discharge opening provided for valley and through which the o are introduced 30 operating machines is relatively far from the called exhaust opening. Figure 29 shows a working machine equipped with a 90° articulated excavation arm from a tracked propulsion unit 91. At the end front of the propulsion unit is also provided a 92 collection shovel intended to accommodate the material moved by a spoon 93 brought by the 5 articulated arm 90. The said collection shovel 92 constitutes a sort of transfer hopper of the material collected on a lower conveyor belt 94 which passes below between the propulsion tracks 95 and below the drive motor of the said 10 tracks 95. Conveyor 94 ends on the rear side where a further unloading conveyor 97 transports the collection material to a higher level at the loading opening of a 98-hectare accumulation box 15 a subsequent operating machine 99 intended for transport the collected material out of the canal. The said operating machine 99 can also be equipped with a 100mm front loading shovel. And in the example illustrated the said operating machine 20 99 includes an independent propulsion unit also, for example, equipped with a cuna pair of tracks. Figure 31 shows a perspective view enlarged view of the operating machine shown in the 25 figure 29. On the back side of the same is omitted the unloading conveyor 97, but it is evident the power and communication cable indicated with 101. Figure 32 shows an enlarged view of the 30 transport operating machine 99 of figure 29. Figure 33 shows a particular machine operator who is intended to operate in the sector of channel placed between the two mobile floodgates 2, 3. Although in figure 2 the distance between the two floodgates are illustrated for convenience relatively small, generally this distance is several meters and also the said segment between the two floodgates 5 2, 3 presents a narrowing of the cross-section of passage, so any accumulated material can compromise the functioning of the two floodgates preventing its functioning and therefore its restoration of the operating conditions and therefore the dismantling 10 of the sealing element. In order to free the area from any debris, segment between the two floodgates avoiding that the same may prevent maintenance operations operating machine according to figure 31 can be 15 provided on the front side between the collection shovel 92 and the lower conveyor 94 of a conveyor front extension indicated with 103 which allow the said collection shovel 92 to be brought into advanced position with respect to the front side of the 20 operating machine and articulated arm 90 and the whose rear end is directly provided to upstream of the loading end of the conveyor lower 94. The said extension conveyor front 103 is made substantially the same 25 lower conveyor level 94 and then has a smaller footprint than the segment light channel with reduced passage section foreseen between the two bulkheads and allows you to clean said segment before the nearest floodgate 3 is opened 30 at the opening for emptying the terminal segment of the channel between the said sluice gate 3 and the opening of entry 4 sealed by the sealing element estate. The procedure therefore provides for the opening of the gate 2 while keeping gate 3 still closed. debris cleaning and maintenance of the segment channel between sluice gate 2 and sluice gate 3, and the 5 subsequent opening of the floodgate 3 having done to take the operating machines out of the canal, for the complete emptying of the terminal segment between the said sluice gate 3 and the entrance opening closed by the element closing.

Claims

CLAIMS 1. Method of maintenance of service channels of water basins, such as outlet channels, or the like, which channels comprise an inlet opening positioned below the level of the water contained in the basin when the basin is full and which opening is in an immersed condition, said opening being provided at its perimeter band with a sealed contact surface and at least along two vertical lateral edges of said opening being provided respectively a vertical guide with a u-shaped section open towards the central area of ​​the opening itself, optionally a lateral wall of the u-shaped guide being a part of the sealing perimeter band, said opening being communicating with a service channel to the basin,which channel is permanently provided with at least one movable bulkhead in a recessed position in the axial direction of the channel and for a predetermined distance with respect to the plane subtended by the opening itself, said bulkhead being associated with movement members which can be operated on command to move said bulkhead from a closed position of said channel to an open position and vice versa, said method providing for the sealing of said opening towards the inside of the basin by means of the positioning in correspondence with said opening of the service channel of a sealing element which comprises a perimeter band configured to slide into said vertical guides, so-called throats, and which band has a sealing gasket designed to adhere in a sealing manner along the entire annular sealing band which surrounds said opening in a condition of complete engagement of said element in said guides,the positioning of said sealing element with said gasket in contact with said sealing band of said opening along the entire extension of said gasket and said band and the optional compression of said gasket in at least some points and / or areas or along the entire extension thereof against said annular sealing band of said opening and which sealing element comprises members for the adjustable displacement and / or compression of at least said gasket / or of the entire sealing element with said gasket against at least a portion of said annular, perimeter sealing band surrounding said opening.

2. Method according to claim 1, wherein the compression is exerted by mechanical pushing members acting between a stationary abutment and the rear side of said sealing element, i.e. the side opposite the opening.

3. Method according to claim 2, wherein said stationary stop is constituted in position by a further vertical guide with a u-shaped cross-section open towards the centre of the opening and which further guide is parallel and adjacent to respectively one of said vertical sliding guides of said closing element and each of which further guides is intended to cooperate with a vertical row of positioning pads which row is provided along each vertical lateral edge of the sealing element and each of which rows is constituted by at least one pair of lateral pads vertically aligned with each other, each of which further vertical guides is positioned at a certain distance from the associated engaging guide of the sealing element on the side of the same opposite to the opening,while said lateral runners are fixed to said sealing element in such a way as to be optionally progressively displaceable along a path with at least one directional component parallel to the direction of approach of the sealing element to the annular perimeter sealing flange surrounding said opening and in such a way as to adjust the distance thereof from the corresponding vertical lateral edge of said sealing element and to exert a predetermined adjustable compressive force of the sealing element against at least a portion of said perimeter sealing band surrounding said opening.

4. A method according to one or more of the preceding claims, wherein the upper ends of at least some or all of the vertical guides are shaped or include a countersink.

5. Method according to one or more of the preceding claims, comprising the step of extending upwards, beyond the upper end of said guides themselves and / or beyond the upper side of the annular sealing band surrounding the opening, one or more or all of said vertical sliding guides of the perimeter edge of the closing element and / or of the vertical rows of pads, with an extension segment of the respective guide which is shaped in such a way as to generate an engagement invitation in said guides, while alternatively or in combination with said upper extension it is also possible optionally to provide a step of providing a lower extension of the closing element and / or of the vertical rows of pads, which lower extension is optionally removable,i.e. separable from the sealing element or activable and deactivatable and / or alternatively movable from an active extended position to an inactive position not protruding beyond the lower edge of the sealing element., 6. A method according to one or more of the preceding claims, wherein the following steps are provided: optionally making and / or restoring an annular sealing band surrounding an opening in a service channel; optionally making and / or restoring vertical sliding guides of a closing element and vertical sliding guides of a vertical row of runners provided on each vertical side of the closing element, respectively; providing a closing element with a sealing gasket along an annular perimeter band congruent with the sealing band and with vertical rows along the vertical edges that can be slidably engaged in corresponding vertical guides; positioning the closing element with said sealing gasket in contact with said annular sealing band surrounding said opening;exerting a predetermined compression in at least some areas or points of the said perimeter sealing band of the said annular gasket provided along the perimeter of the said closing element against the said annular gasket; controlling the said at least one bulkhead residing in the said service channel and providing for the discharge of the diaphragm of water present between the said bulkhead and the said sealing element positioned in the operating condition of sealing the said bulkhead, while after the end of the maintenance and / or restoration operations of the channel, the said method provides for the following steps: closing of the mobile bulkhead(s) permanently provided in the channel; progressive flooding of the sector of the channel included between the said mobile bulkhead(s) in the condition of closing the channel and the said sealing element of the entrance opening of the channel;following completion of the flooding of the said channel segment, deactivation of the compression members of the closing element against the annular, perimeter sealing band surrounding the said opening and moving the said sealing element to a position that does not coincide with the said opening and / or recovery of the same and storage in the warehouse.; 7. Method according to one or more of the preceding claims, wherein the discharge channel has, in a recessed position with respect to the opening communicating with the basin, two bulkheads that can be controlled independently in the closed position and in the open position of said channel, it being foreseen to open said two bulkheads at different moments in time distant from each other after the closing element has been brought into operational condition, the bulkhead furthest from said opening being opened first and the intermediate area between said two bulkheads being cleaned, before the opening of the second bulkhead.

8. System for implementing a method of maintenance of service channels of water basins, such as outlet channels, or the like, which channels comprise an inlet opening positioned below the level of the water contained in the basin when the basin is full and which opening is in an immersed condition, said opening being provided at its perimeter band with a sealed contact surface and at least along two vertical lateral edges of said opening being provided respectively a vertical guide with a u-shaped section open towards the central area of ​​the opening itself, optionally a lateral wall of each of said u-shaped guides respectively a part of the sealing perimeter band surrounding said opening along two diametrically opposed vertical sides, said opening being communicating with a service channel to the basin,which channel is permanently provided with at least one movable bulkhead in a recessed position in the axial direction of the channel and for a predetermined distance with respect to the plane subtended by the opening itself, said bulkhead being associated with movement members which can be operated on command to move said bulkhead from a closed position of said channel to an open position and vice versa, said system comprising a sealing element for said opening which comprises a perimeter band configured to slide into said vertical guides, so-called grooves, and which band has a sealing gasket designed to adhere in a sealing manner along the entire sealing band surrounding said opening in a condition of complete engagement of said element in said guides,and which sealing element further comprises adjustable compression members of said gasket against at least a portion of said annular, perimeter sealing band surrounding said opening.

9. System according to claim 8, wherein said sealing element is provided in combination with one or more compression actuators in the form of mechanical push members acting between a stationary abutment and the rear side of said sealing element, i.e. the side opposite the opening and opposite to the one carrying said sealing gasket.

10. System according to claims 9, wherein said stationary stop is constituted by a further vertical guide with a u-shaped cross-section open towards the centre of said opening and which further guide is parallel and adjacent to respectively one of said vertical sliding guides of said closing element and each of which further guides is intended to cooperate with a vertical row of positioning pads, which row is provided along each vertical lateral edge of the sealing element and each of which rows is constituted by at least one pair of lateral pads vertically aligned and spaced from each other by a predetermined amount, each of which further vertical guides is positioned at a certain distance from the associated engaging guide of the sealing element on the side of the same opposite to the opening,while said lateral runners are attached to said sealing member in a displaceable manner along a path with at least a directional component in the direction of the distance thereof from the corresponding vertical lateral edge of said sealing member and exerting a predetermined adjustable compressive force of the sealing member against at least a portion of said perimeter sealing band surrounding said opening., 11. System according to one or more of the preceding claims 8 to 10, wherein the upper ends of at least some or all of the vertical guides are shaped or include an introductory flare.

12. System according to one or more of the preceding claims 8 to 11, comprising an upper extension of a corresponding vertical guide, which extension can be fixed in a stable or removable manner, said extension being shaped as an extension for the insertion of the closing element and / or of the rows of lateral, vertical runners in said vertical guides.

13. System according to claim 11 or 12, wherein the closing element is provided with a lower extension for engagement in said vertical guides, which engagement extension carries at least one sliding shoe for each vertical side of the closing element and which extension and / or the shoes thereof are alternatively activated and deactivated.

14. The system of claim 13 wherein said lower engagement extension comprises a frame displaceably secured from an active position projecting beyond the lower edge of said sealing member to an inactive position wherein said frame is positioned overlapping the rear side of the closure member in a fully retracted position within the perimeter edge thereof, said frame being coupled with at least one engagement shoe at a vertical side thereof, and which shoe is cantilever mounted on a support displaceable from an active position of said shoe wherein the same protrudes from the vertical edge of the frame to such an extent as to be aligned with the row of shoes along the corresponding vertical edge of the closure member and to engage in the corresponding vertical guide,in an inactive position in which the said skate is in a retracted position relative to the corresponding vertical edge of the closure element., 15. A system according to claim 14, wherein said frame is pivoted to the lower area of ​​the rear side of the closing element in a manner that is oscillating with respect to a horizontal axis and / or parallel to the lower edge of said closing element and is tiltable from an inactive position in which it is positioned overlapping the rear side of said closing element and not protruding beyond the perimeter edge thereof, downwards to a position in which it protrudes downwards beyond the lower edge of said closing element, in which position the skate or skates carried thereby are movable into a vertically aligned position beneath the skates of each vertical row of skates along the two opposite vertical perimeter edges of the closing element.

16. System according to one or more of the preceding claims 8 to 14 wherein at least some, preferably all, of the skates forming the vertical rows of skates are mounted on an arm extendable and retractable with respect to the lateral vertical edge of the closing element and respectively in the direction of engagement and disengagement in and from the corresponding vertical guide.

17. System according to one or more of the preceding claims 8 to 16, wherein at least some, preferably all, of the support arms are mounted on movable supports for moving said arms along a rectilinear or curvilinear path away from or towards the rear side of said sealing element.

18. System according to one or more of the preceding claims 8 to 17, wherein the closing element comprises a plate shaped to carry along the perimeter edges thereof at least one annular sealing gasket intended to cooperate with the annular sealing band that surrounds said opening, while said plate is provided with a central, vertical reinforcement frame to which two or more transverse or horizontal arms are pivoted in an oscillating manner around a vertical axis and / or parallel to a vertical perimeter edge of said plate, which arms are made respectively extendable and retractable in the direction of their longitudinal extension and which arms carry at their free end opposite to the fulcrum end at least one shoe,while pusher members are provided interposed between the said arms and the rear side of the said plate which engage the respective arm at an intermediate point of the said arm and provided at a certain distance from the fulcrum end and from the end which carries the skate.

19. System according to one or more of the preceding claims, wherein at least one point of the central band of the sealing element includes a passage opening in combination with a valve for closing and opening said opening.

20. System according to one or more of the preceding claims 8 to 19, wherein the discharge channel has, in a recessed position with respect to the opening communicating with the basin, two bulkheads that can be controlled independently in the closed position and in the open position of said channel, a control station for opening said two bulkheads being provided which is configured to open said two bulkheads at different times after the closing element has been brought into operational condition, the bulkhead furthest from said opening being opened first and the intermediate area between said two bulkheads being cleaned before the opening of the second bulkhead.

21. System according to one or more of the preceding claims 8 to 20, wherein in combination with said closing element there are provided means for constructing and / or restoring alternatively or in combination said annular sealing band surrounding an opening of a service channel; and / or one or more of the vertical sliding guides of a closing element and / or the vertical sliding guides of respectively a vertical row of runners provided on each vertical side of the closing element.

22. System according to claim 21, wherein said construction and / or restoration members consist of at least one support frame of guides for moving one or more milling, smoothing tools and / or one or more mortar application nozzles, which support frames are provided with fixing elements in position corresponding to the sealing band surrounding the opening and / or one or more of said vertical guides.

23. System according to one or more of the previous claims 8 to 22, wherein in combination with said closing element operating machines are provided, preferably remote-controlled, for the removal of the material accumulated inside the channel and / or for the application of coating and / or restoration of the walls of said channel.

24. System according to claim 23, wherein at least one operating machine comprises at its head one or more tools for collecting and / or grasping debris or other material, a subsequent conveyor belt which extends in the longitudinal direction of said operating machine and onto which said collection and / or grasping members unload the collected debris and which conveyor belt ends in a collection container arranged upstream or downstream of a motorized traction unit, said operating machine being equipped with a control unit which can be controlled by means of a remote control unit.